Rhyacobates constrictus Tran & Nguyen, 2016

Figs 3I, 5H, 6H, 26

Rhyacobates constrictus Tran & Nguyen, 2016: 508–512, figs 24–39 (original description).

Diagnosis

Body length of apterous females 8.70–9.40, of apterous males 6.90–7.10. Color (Figs 3I, 5H, 26): dorsum of head mainly yellow, with a median, longitudinal brown marking on anterior three-quarters; pronotum with a median yellow marking (in males, median marking narrower); mesonotum and metanotum entirely black, without yellow markings. Female: abdomen relatively short; ventral length of pregenital abdomen about 0.4 times body length (Figs 3I, 26B); abdominal apex curved dorsad; mediotergite I swollen; connexivum of segments I–V narrow, of segment VI wider; abdominal segment VII tapering towards apex (Figs 5H, 26A); laterosternites of connexivum VII expanded dorsad and curved mesad; posterior margin of sternum VII with narrow median process. Male: middle trochanter without spines; small spines on middle femur scattered, not arranged in distinct row; length of middle tibia ca 1.5 times length of hind tibia; abdomen relatively short; pygophore simple, with rounded apical margin; proctiger with broadly angular lobe on each lateral side (Fig. 6H); paramere curved at basal fourth, strongly thickened at middle part, then tapering towards apex, distal part with scattered short setae.

Material examined

Type specimens (Fig. 26)

See Tran & Nguyen (2016).

Distribution

Vietnam: Phú Thọ (Tran & Nguyen 2016).

Comparative notes

Tran & Nguyen (2016: 512) provided comparative notes between R. constrictus, R. abdominalis and R. recurvus, which all have a median process on the posterior margin of mediosternite VII of the female. Also see further comparative notes under R. bui sp. nov. and R. turgidus sp. nov.