Elytra, 「ok、,o, 26 (l ):201 -205, May I5、 1998

An Addition to the GenusNecydalis(Coleoptera,Cerambycidae) from Northern Vietnam

Tatsuya NIIsATo

Bioindicator Co., Ltd., Takada3- l 6-4, Toshima-ku, Tokyo, 171-0033 Japan

A bst r ac t A new Nee、,dalis species is added to the cerambycid fauna of northernvietnam, under the name of N. katsul・ao,-um sp nov. It seems to be an isolated specieswithin the subgenusNecydalis, because of its short and less elongated body in contrast tothe voluminous head and thoraces, and of the slender and hardly ample female abdominalsegments.

The Vjetnamese species of the genusNecydalis were enumerated by TAKAKuWAand N llsATo (1996), who recorded five species, viz., N. (Necydalis) hit'aya'na1

em onea, . ( ) sit加 0,f f, . ( ) ,narg加pemls, . ( ) s「' 'na f and .

(Eonecydalis) bico1o,. After that, TAKAKUwA(1997) described a new member of thegenus under the name ofN. (N) kumei based on a single female specimen collected atMeo village of northern Thailand. Thus, total six species of the genus have so far beenknown in the cerambycid fauna of the Indochinese region.

Recently, I had an opportunity to examine a peculiarNecvdalis specimen col-lected on Mt. Tam Dao northwest of Hanoi in northern Vietnam. It was found by Mr.Takao ARAl among the coleopteran specimens preserved by Mr. NobuhikoKATSURA. Itwas submitted to me for taxonomic study through their courtesy. It is evident that thespecimen belongs to a new species since no close relatives are known in the genus.This new species is somewhat related to N shinborii and its close allies, N nanshanen-sis and N y,akus1limensis. However, it does not show distinct sexual dimorphism unlikethe latter three species, and has a reduced body with voluminous head and prothorax.In the fo11owjng lines, I will describe it as a seventh member of the genusNecydalisfrom Indochjna. The new name is given after Mr. Nobuhiko KATsuRA and his familyfor offer of invaluable specimen used in this study.

I am deeply indebted to Dr. Shun-Ichi UENo of the National Science Museum(Nat. Hist ), Tokyo, for constant guidance and reading the original manuscript of thispaper. Deep gratitude is also due to Messrs. Takao ARAI and NobuhikoKATSuRA ofshinjuku for their kind help in obtaining the invaluable specimen. The abbreviationsused in the description are explained in the other paper of mine published in the pre-sent issue of the Elytra.

202 Tatsuya NllsATo

Necydalis (Necydalis) katsuraormn sp nov.(Figs.1-2)

Fem a l e. A small species, with fairly short body. Colour largely dark reddishbrown with black head and thoraces, dull in general, though moderately shiny on forebody; head black, with mouth parts except for mandibles dark yellowish brown, eyesdark brown; elytra dark reddish brown, with black external and sutural margins, theblack areas being slightly produced onto disc behind middle, apices slightly infuscate;abdomen dark reddish brown, in fuscate near median line on stemites 3-5; antennaeand legs dark reddish brown, infuscate on dorsal side of scape, on tarsi and basalhalves of femora. Body rather sparsely clothed with golden yellow hairs, and partlywith dense silvery white pubescence; head with dense golden yellow pubescence ongenae and near eyes; antennae densely with minute pale pubescence and dark brownone; pronotum thinly with pale pubescence, and partly with golden yellow hairs atsides and at centre near base, supplemented with recumbent silvery white pubescenceat sides near base; scutellum densely with pale yellowish brown pubescence; elytrarather sparsely with yellowish brown pubescence, though the pubescence becomesdenser near suture in basal third and apices; meso- and methathoraces densely with sil-very white pubescence and yellowish brown hairs, which become brownish on tarsiand apical halves of tibiae.

Head large and voluminous, distinctly wider than pronota1 apex (HW/PA t 34)and slightly so than the maximum width of pronotum across lateral swellings(HW/PW1.05), densely and scabrously punctured; frons slightly wider than long (FB/Fi t 33),with sides gently divergent apicad, apex a little wider than base (FA/FB 1.08), providedwith a median groove complete and very deep, and rather weak lateral ones, fronto-clypea1 suture very deep; clypeus provided with large punctures on apical hal f, apicalmargin almost truncate; genae nearly 2/3 the depth of lower eye-lobes; eyes moderatein size, hardly prominent laterad; vertex weakly convex. Antennae short,0.44 times aslong as body, reaching the middle of abdominal tergite3, moderately thickened anddistinctly inflated in apical seven segments; scape subquadrate and weakly arcuate,nearly equal in length to segment3; segments2 and3 simply thickened at each apex,the former segment 14 times as long as the latter; relative lengths of segments as fol-lows: - 10.4: 3.1: 10.4: 7.6: 12.2: 10.8: 11.1: 9.4: 8.6: 8.0: 8.4.

Pronotum relatively large though short (PL/PW l.06); base slightly wider thanapex (PB/]:)A 1.15), gently arcuate, nearly as wide as elytra (PW/EW 098); sidesweakly constricted before and behind the lateral swellings at apical3/7, which are con-spicuous though rounded; disc rather weakly convex, transversely concave in apical2/7, almost flattened in basal seventh, with surface densely and scabrously punctured,and partly provided with large punctures near the smooth median area. Scutellum tri-angular and narrowly truncate at apex, concave in apical half.

Elytra fairly short (EL/EW1 .05), barely reaching the base of abdominal tergite3,with sutural margin weakly sinuate; sides weakly produced at humeri, straightly con-

Addition to the GenusNlecydalis from vjetnam

Fig. 1 . Necydalis katsuraoru″l spnov., holotype , from MtTam Dao in northern Vietnam.

2 03

Ve「9ent to apical 3/10, then arcuately so to apices which are almost truncate; disc dls_tinCtly Concave nea「 Suture at a level between middle and apjca1 fjfth, and moderatelySo at Cent「e of apical fifth, strongly reflexed in apical fifth, with surface coarsely anddensely Punctured. Hind wings barely reaching the base ofapjcal tergjte

p「oStemum Scab「ously and coarsely punctured; presternal process forming a

2 04 Tatsuva NIIsATo

Fjgs 2_5 Female fore bodies of the subgenus No、dalis spp. - 2, N katsut'ao'uni Sp nov., holotype,from northern v jelnam; 3, N nans11anensts KusAMA、paratype、 from central Taiwan; 4. N. S/1inbo''iiTAKAKUwA ct Nl1sAT0、 from northern Vietnam;5、IV. esakii MIWA et MITON0 f「om Cent「al Taiwan・

broad spoon_shape in apical 2/3, slightly exceeding the hind margins of pleuralprocesses. Mesosternum coarsely shagreened. Metasternum densely provided withcoarse punctures. Abdomen slender though not so elongate, 0.67 times as Ion9 asbody, weakly dilated to apex, with surface shagreene provided with sparse minutepunctures on sternite3; sternite3 nearly one and half the length of sternite4, withsjdes parallel in basal seventh, then moderately dilated apica thickened at apex; Ste「一njte4 slightly longer than sternite5, moderately dilated apicad, sternites5 and6 nearlyequal in length, broadened, moderately arcuate at sides; anal sternite eton9ate, 2.3tjmes as long as basal width, almost parallel-sided, with apex weakly arcuate, and p「o-vided with a shallow concavity at centre; anal tergite elongate, divergent to apex, Withrounded apical margin.

Legs slender though rather short. Hind leg short, exceeding anal tergite at apex oftjbja; femur extending to apical margin of tergite5, weakly clavate in apical4/7; tibiaslender, slightly sinuate; tarsus simple.

Body length 17.5 mm.Type specimen. Holotype , Mt. Tam Dao, Vinh Phu Prov., N. Vietnam,10-V-

I997, local collector. Deposited in the collection of the National Science Museum(Nat. Hist ), Tokyo.

Notes. It is difficult to determine the true affinity of this new species, since it hasbeen known only from a single female specimen, which .1s most probably a small indi-vidual. So far as the external characters are concerned, it is somewhat similar to Nnanshatlensis and its relatives. The voluminous fore body and thick short antennae ofthjs new species remind us of certain tropical species of the subgenusNecydalis. Thisnew species probably represents an intermediate state between the N.natlshanetlsislin-eage (N shinbo,-ii, N nanshanensls and N yakushimensis) and theN esakii one (N.

Addition to the Genus Nee、,da lis from Vietnam 205

esa' l', M marg加pennis, M mfzunumai and M 1″net). It is, however, necessary to con-

firm its systematic position when additional specimens including males are obtained.Accordjng to personal communication withMr. N. KATsuRA, the holotype of this

new species was collected together with suchNecydalis species as N. strnad1, N shin-borii and N marginipennis by local collectors of Tam Dao Village. The specimen Wasbrought to Mr. KATsURA as a male of N shinborii because of its small and na「「oWbody form and similar coloration to the male of the latter species. Though I heard of arumor that a male of this new species was already collected on Mt. Tam Dao, I haveunfortunately been unable to trace its source.

要 約

新里達也: 北ベトナムから追加発見されたホソコバネカミキリ属の1 新種. - イン ドシナ

地域のホソコバネカミキリ属に関する記録は, 1989年に北ベトナムからN. strnadi HoLzHcHuHが記載されるまではまったく知られていなかったが, 最近になって, TAKAKuwA& NusATo(1gg6) は, 北ベトナムから2新種, 1 新亜種を含む5種を記録し, またTAKAKuwA(1997)はタイ北部から1 新種を記載した. これによって, 同地域からは6種のホソコバネカミキリ類が知られることになった. ところが昨年の夏, 北ベトナムのタムダオ山で採集された本属の不明種の1 雌個体の標本が, 葛信彦, 新井孝雄両氏により新たに見出された. この個体は雌でありながら, 一見すると, 同所的に生息するN shmbo,ll, とくにその雄個体に類似しているが, 体と触角はいちじるしく短く, 前胸背板は幅広いうえに, 雌雄異形がいちじるしく現れる同種の雌個体とはまったく異なる体形と色彩を呈している. その後さらにこの標本を詳細に検討したところ, 本属のいずれの既知種とも異なることが判明したので, 本論文でカツラホソコバネカミキリ (新称) Necvdaliskatsuraorum sp nov. として記載命名した. なお, 新名は発見者のひとりである葛信彦氏とその家族に献名した.

Re ference

GREsslTT, J. L., 1948. New1ongicom beetles from China, XII (Col : Ceramb). Lingnan ,S◆cl. J., 22:43 -52, pl. 1.

HoLzHcHuH, C. von, lg89. Beschreibung neuer Bockkafer aus Europa unci Asien(Cerambycidae, Col ).Koleopt. Rdsch., 59: 153- l83.

KusAMA, K., 1974. Two n e w species and a n e w subspecies of Nlecydalis from Formosa and Japan(Coleoptera: Cerambycidae). Rcpt. Fac. Sci. Shizuoka Univ.,9:51-56.

_ 1g75. Notes on the1ongicom genusN,ecydalis, homonym and synonym. Elytra, '「tokyo,2: 22.M1wA, Y, & T. MIToNo, l g37. On a new Necydalis from Formosa (Coleoptera, Cerambycidae). Annot.

zoo1.Japon.,16: l61- l64, pl 9.TAKAKuwA, M., l997. A new necydaline longicom beetle from northern Thailand. Bull. Kanagawa

pre Mus nat. Sci., (26):37-39._ & T. NnsATo, 1996. The genusNecydalis (Coleoptera, Cerambycidae) from northern Vietnam,with descriptions of two new taxa. Ibid., (25):77-86.

YoKoYAMA, H., 1971. The cerambycidaefrom Ryukyu and Satsunan Islands,2 (Coleoptera). En t. Rev.

Japan, 23:93-101, pl 6.