Rhyacobates angustus Tran & Nguyen, 2016

Figs 3G, 5F, 6F, 24

Rhyacobates angustus Tran & Nguyen, 2016: 502–503, figs 1–10 (original description).

Diagnosis

Body length of apterous female 11.30 (holotype), of apterous males 7.70–8.10. Color (Figs 3G, 24B): dorsum of head yellow with a median longitudinal dark marking on anterior three quarters; thorax of female with a broad median yellow marking on pronotum (about one third of pronotal width), a relatively broad median yellow stripe on posterior four-fifths of mesonotum, and a median yellow marking on metanotum; thorax of male with with a narrow median yellow marking on pronotum, a narrow yellow median stripe on posterior four-fifths of mesonotum, and without yellow markings on metanotum. Female: ventral length of pregenital abdomen about two-thirds body length; connexivum of abdominal segments I–VI widened; abdominal segment VII elongate, dorso-ventrally depressed, with a pair of broad, subtriangular connexival processes (Figs 5F, 24A); posterior margin of sternum VII convex and widened. Male: middle trochanter without spines; small spines at basal fifth of middle femur not arranged in distinct row and those at distal four-fifths arranged in distinct row (Fig. 24C); length of middle tibia ca 1.6 times length of hind tibia; abdomen relatively short, posterior segments slightly curved ventrad; pygophore simple, with rounded apical margin; proctiger with rounded lobes laterally (Fig. 6F); paramere relatively slender, curved at basal third, slightly thicker at middle part, and apex narrow and directed mesad.

Material examined

Type specimens (Fig. 24)

See Tran & Nguyen (2016).

Distribution

Vietnam: Lào Cai (Tran & Nguyen 2016).

Comparative notes

Rhyacobates angustus resembles R. zetteli, as discussed by Tran & Nguyen (2016: 503, 507–508). It is also similar to R. bui sp. nov. and R. elongatus sp. nov.; see comparative notes under R. bui .