Glenea signaticollis Gahan, 1889

Hiremath, Sangamesh R. & Lin, Mei-Ying, 2021, Description of two new species of Glenea Newman, 1842 from southern India and reinstatement of Glenea vestalis Heller, 1934 (Coleoptera: Cerambycidae: Lamiinae: Saperdini), Journal of Natural History 55 (3 - 4), pp. 205-245 : 238-243

Glenea signaticollis Gahan, 1889

( Figures 39–42 , 45 )

Glenea signaticollis Gahan, 1889: 219 . TL: India, Bombay. TD: BMNH.

Type specimen examined

India ( Bombay ) ( BMNH). Examined based on an image .

Other specimens examined

1 ♀, Madura , Coll. Dr. Itzinger ( NHMB, ex FREY); 1 ♀, Nilgiri Hills, S. India (G.V. Campbell). 1 ♀, Nilgiri Hills , Coll. A.K. Weld Downing (Travancore Insect Collection, KAU).

Description

Body reddish brown; antenna reddish brown; head and pronotum reddish brown or black; legs yellowish brown; ventral body black, except for sternite VII reddish brown.

Head with frons, genae and scutellum pale yellow in holotype (it is probably a male specimen), while often black in females; anteclypeus, labial and maxillary palpi yellowish brown; postclypeus black, apical margin thickly adpressed with creamy white hairs interspersed with four pairs of suberect, elongate, reddish brown setae; labrum reddish brown, medially interspersed with two suberect, elongate, yellowish brown setae arising from respective punctures, apical margin indisticntly emarginated; frons with two longitudinal, pale yellow-haired bands at sides, extending backwards and traversing vertex; frontal disc, between lateral bands, moderately covered with sparse pale yellow hairs; genae densely covered with pale yellow hairs; lower eye lobes 3 times as long as genae in males, 0.5 times as long as genae in females; frons as wide as one lower eye lobe in males and three-fourths wider than one lower eye lobe in females; head coarsely and densely punctured.

Antenna One-quarter longer than body in male, slightly longer than body in female; scape short and thin. Ratio of lengths of antennomeres in female: 1.00: 0.13: 1.40: 1.13: 1.00: 0.93: 0.93: 0.87: 0.80: 0.73: 0.87.

Pronotum as long as broad in males, slightly transverse in females, coarsely and densely punctured; prothorax with five longitudinal, pale yellow-haired bands: one located in middle of pronotum, narrow, often rubbed at middle in preserved specimens; two located at lateral sides of prothorax, each distinctly broad, indented or straight at middle of inner margins, while outer margins irregularly sinuated, top three bands narrowly united ante-basally in females, while broadly united in holotype; other two located at ventro-lateral sides of prothorax, each broad, connecting with outer margins of procoxae.

Scutellum semi-circular, densely covered with white hairs.

Elytra subparallel, apex distinctly truncated, sutural margin pointed apically, marginal angle stretched into elongate spine ( Figures 39 (a) and 45(a)); proximal three-fourths of elytral disc coarsely and densely punctured; sublateral margin impressed with two longitudinal carinae: one begins at base of humeral prominence, terminates well before elytral apex, the other begins just below humeral prominence, terminating along apical spine of marginal angle; humeral prominence angularly projected ( Figure 45 (b)); elytral disc densely covered with minute yellowish brown hairs, each elytron with seven pale yellowhaired spots: one oval haired spot at base of elytral epipleura; three situated at premedian and disposed broadly in obliquely triangular fashion: first one situated at basal third, in middle of disc between sutural and sublateral margin, second one situated obliquely to first, just behind basal third, along inner side of sublateral carina, third one larger than the first two spots and situated just before middle, situated obliquely to second one at middle of disc between sutural and sublateral margins; remainder of three situated behind middle: first one largest, oval, slightly situated behind middle, close to sutural margin and situated away from sublateral margin; second one circular, situated at apical fourth, situated along inner side of sublateral carina; third one situated apically and transverse.

Legs with tarsal claws divaricate.

Sternites densely covered with short, fine, grey-white hairs; mesepisternum ornamented on each side with a transverse creamy white, thickly haired spot; metasternum ornamented on each side with a broad, oblique, creamy white, thickly haired spot; metepisternum on each side ornamented postmedially with an oval, creamy white thickly haired spot, much smaller than haired spot on metasternum.

Ventrite densely covered with short fine, grey-white hairs; each side of ventrite I–IV covered with two short longitudinal white-haired spots posteriorly, spots often connected to each other by a narrow white haired band; sternite VII, on each side, covered with a short longitudinal white-haired spot postemedially. In female, sternite VII convex, about 0.32 times as long as total abdominal length, about 3.00 times as long as ventrite IV; disc of sternite VII medially impressed with a fine, dark brown longitudinal sulcus, with a short, medial ridge pre-apically; apical margin broadly concave.

Female genitalia ( Figure 42 (a–b)) with ovipositor about 1.35 mm long, in dorsal view, up to base of coxite lobe, randomly and sparsely distributed with circular punctures, apical third densely covered with short, spiculate grey setae. Coxite lobe ( Figure 42 (b)) yellowish brown, randomly and remotely distributed with a few circular punctures; apical margin adorned with about five small setae, flanked on either side with an elongate seta. Stylus ( Figure 42 (b)) distinct, dome-shaped; integument yellowish brown; in dorsal view, provided with two circular punctures near base; apex of stylus bears three distinctly elongate setae arising from associated punctures. Vaginal plates sub-rectangular, weakly sclerotised, separated from one another; integument mostly translucent with faint, yellowish brown tinge; basal half linearly reddish brown on lateral sides. Bursa copulatrix elongate, bisinuate with distinct curvature at apical third; proximally narrow tube, gradually widening towards distal end; integument strongly adorned with transverse plications except basal third. Spermathecal duct slightly longer than bursa copulatrix and distinctly longer than spermatheca, enters bursa copulatrix at apical third, basally translucent tubule, followed by thick, yellowish brown, sickle-shaped tube up to middle; immediately behind middle, slightly curved and continued as a slender tube towards apex. Spermatheca and spermathecal gland opens separately on spermathecal duct. Spermatheca yellowish brown, opens on lateral side of apex of spermathecal duct, and connected to it via a distinctly slender tubule; stalk thick, elongate tubule, narrowed basally and curved towards apex; capsule distinctly capitate. Spermathecal gland strongly wrinkled tubular sac, basally without sclerotised ringed plate. In the specimen examined, tignum measured about 5.95 mm in length while abdomen measured about 5.08 mm.

Distribution

India (Tamil Nadu: Madurai, Nilgiri Hills; either Maharashtra or Karnataka).

Remarks

The description comes from Gahan (1889) and Breuning (1956b) and from studying a single female specimen along with the images of the holotype and other identified materials of G. signaticollis . The female genitalia is described and illustrated based on a single female specimen held at the Travancore Insect Collection, KAU, India. Gahan (1889) doubtfully indicated Bombay as the type locality; however, ‘Bombay’ usually referred to the erstwhile Bombay presidency in British India and not particularly to a city. Since other materials studied in the present research originate from Western Ghats, it is safe to assume that the holotype might have been collected from the presentday Western Ghats region of either Maharashtra or Karnataka, parts of which were under erstwhile Bombay presidency.

Figures

Figures 39–40. Glenea signaticollis Gahan, 1889. 39(a–d) Female: 39(a) Dorsal view. 39(b) Lateral view. 39(c) Ventral view. 39(d) Head, frontal view. 40. Holotype. Scale bars: 1 mm.

Figures 41–42. Glenea signaticollis Gahan, 1889. 41. Specimens identified by Breuning, held at NHMB. 42(a–b) Female genitalia: 42(a) whole female genitalia, 42(b) close-up of ovipositor. Scale bar: 1 mm. Figures 41 and 42(b) not to scale.

Figures 43–45. Line drawings of elytral apex and humeral prominence. 43(a–b) Glenea pseudoalbosignatipennis sp. nov. 43(a) Emarginated elytral apex. 43(b) Distinctly angulated humeral prominence. 44(a–b) Glenea albosignatipennis Breuning, 1950. 44(a) Obliquely truncated elytral apex. 44(b) Weakly angulated humeral prominence. 45(a–b) Glenea signaticollis Gahan, 1889. 45(a) Distinctly truncated elytral apex. 45(b) Moderately angulated humeral prominence. Line drawings not to scale.