Oxytelus subferrugineus Cameron, 1929

Lü, Liang & Zhou, Hong-Zhang, 2012, 3576, Zootaxa 3576, pp. 1-63 : 49-51

Oxytelus subferrugineus Cameron, 1929

( Figs. 19A–N)

Cameron, 1929: 443 (subgenus Tanycraerus ; Type locality: Pahang: Behong); Scheerpeltz, 1933: 1104; Herman, 1970: 411; Herman, 2001: 1459 (distribution).

Oxytelus nilgiriensis Cameron, 1930: 227 (subgenus Tanycraerus ; Type locality: Nilgiri Hills); Scheerpeltz, 1933: 1100; Herman, 1970: 410; Herman, 2001: 1445 (distribution). Syn. nov. [by P. M. Hammond according to the labels]

Material examined. 10 specimens, 5 males and 5 females. 1 female, Bentong, Pahang, F.M.S. Dr. Cameron.// O. subferrugineus Cam. TYPE// M. Cameron. Bequest. B.M.1955–147// Oxytelus subferrugineus Cam., P.M.Hammond det. 1970, LECTOTYPE ♀ ( NHM); 1 male, Nilgiri Hills, A.K.Weld Downing// a 551// M. Cameron. Bequest. B.M.1955–147// O. nilgiriensis Cam. TYPE// Oxytelus nilgiriensis Cam., P.M.Hammond det. 1970, LECTOTYPE ♂ ( NHM); CHINA, Guangxi: 1 male, Fulong near Fangchenggang, 220m, 16.III.1998, Hai- Sheng Zhou leg. ( IZ-CAS); 1 female, Daxin, 280m, 29.III.1998, Hai-Sheng Zhou leg. ( IZ-CAS); MALAYSIA: 1 male, 2 females, Borneo, Sabah, Mt. Kinabalu Nat. Pk., Poring Hot Springs, 495m, 27.VIII.1988, A. Smetana leg. ( FMNH); VIETNAM: 1 male, 1 female, Tonkin, Hoa-Binh, 1930, Clermont leg., nilgiriensis Cam. det. Bernhauer, Oxytelus subferrugineus Cam. = nilgiriensis Cam. det. P. M. Hammond 1970 ( FMNH).

Redescription. Body black or dark brown but elytra light brown to testaceous, abdomen dark testaceous. Mandibles lateritious. Antennomeres 1 – 4, maxillary palpi and legs yellow to testaceous. Length [average] male, 4.2 mm; female, 3.9 mm.

Male. Head ( Fig. 19A) subtrapezoidal with widest at temples. Disc rough, rugose on basal half, not pubescent. Clypeus reversed trapezoidal, as long as 1/4 head length, with widest along anterior margin, slightly depressed in basal part, surface glabrous, impunctate and coriaceous; anterior margin serratulate and forward barely beyond anterior margin of supra-antennal ridges. Epistomal suture with lateral portions straight and running posteromedially to level of anterior margin of eyes. Vertex slightly convex but flat anteriorly, posterior part not well-limited and continuous with neck in median; mid-longitudinal suture short and feeble. Eyes with fine facets, much shorter than temples, and slightly protruding laterally. Temples dilated posterolaterally. Occipital suture with middle portion absent; nuchal ridge present but feeble in some cases, dorsal basal ridge present.

Mandible ( Fig. 19C) stout, falciform, strongly curved; two denticles on inner edge, one near middle and one near apex. Antenna (type I) almost equal to head and pronotum together, with apical antennomere as long as two preceding together.

Pronotum transverse, broadest at near anterior 1/3, little narrower than head. Disc 3-sulcate (as Fig. 1H), median sulcus and two paramedial sulci deep and punctate; two paralateral depressions shallow and striate; lateral margin even across length; posterolateral angles rounded. Elytra translucent, punctate, not rugose, with lateral longitudinal ridge absent.

Abdomen coriaceous and pubescent, broadest at segment V. Sternite VII ( Fig. 19E) with deep, broad, arcuate emargination in middle of posterior margin, shallowly emarginate on each side, between median and each lateral emargination with triangular process, and posterior margin fringed. Sternite VIII ( Fig. 19F) enlarged anterior to basal ridge, with subbasal ridge interrupted near middle; posterior margin deeply bi-emarginate forming triangular median plate, slightly depressed in center, with mid-longitudinal internal ridge present, apex slightly emarginate and with transverse carina behind; lateral plates dark, triangular, covered with long setae. Tergite X ( Fig. 19H) longer than wide, posterior margin bi-emarginate, with two lines of setae on haired posterior part.

Aedeagus ( Figs. 19K–N). Median lobe, oblong-ovoid, weakly bulbous at base, with internal sac apex lingulate and everted from inside, with sclerite-like or membranous structures in apical part of median lobe; apical orifice with ventral brim not confluent until apico-medial hook; apico-medial hook bent at near base, with apex of spadeshape, furcate, sharp edged; dorsal membranous area not covering all dorsum and not across length of median lobe. Paramere arm-like, with seta at half of apical arm, with apex enlarged and with dorsal process present, with two small processes near articular fovea and small process on lateral surface.

Female. Head ( Fig. 19B) smaller than male, narrower than pronotum; clypeus with anterior margin broadly rounded and not protruding; temples shorter than eyes, not dilated; mid-longitudinal suture obsolete; occipital suture present in middle. Mandible ( Fig. 19D) shorter and slenderer.

Abdominal sternite VII without denticles on posterior margin. Sternite VIII ( Fig. 19G) with posterior margin broadly rounded and shortly protruding in middle. Tergite X ( Fig. 19I) shorter and narrower, with posterior margin truncate.

Spermatheca ( Fig. 19J) ʋ- shaped, tiny, bent at middle, basal portion weakly bulbous, with apex hook-like.

Distribution. China (Guangxi); Vietnam; Malaysia; Indonesia; India.

Remarks. Males of this species can be easily distinguished from other Oxytelus species by the distict shape of posterior margin of sternites VII and VIII. With regard to the synonymies of O. subferrugineus = O. nilgiriensis , the first species was established with only female types, and O. nilgiriensis only with male types. On the labels of a pair of Vietnam specimens (one male and one female from same place and captured by same collector), we saw P. M. Hammond’s identification and he treated O. nilgiriensis as a synonym. And in Borneo, A. Smetana collected more specimens both male and female in the same place and on the same day. Comparing these specimens with each other and with types of O. subferrugineus and O. nilgiriensis , we agree with P. M. Hammond.