Alluropus calcaratus

Figs 1, 2, 3

Diagnosis. Body with 21 LBS, and LBS 7 th with spiracles (Fig. 2 E). Antennae (Fig. 2 A, B) composed of 20 – 21 articles, of which three basal ones glabrous dorsally. Cephalic plate smooth, lateral and posterior marginations absent; the posterior edge straight, and covered by tergite 1 (Fig. 2 A). Forcipular trochanteroprefermur with median tooth; tooth-plates with 4 + 4 teeth clearly, sharply (Fig. 2 B). Tergite 1 wider than the cephalic plate and twice as long as tergite 2 (Fig. 2 A); tergites 3 – 19 (20) with complete paramedian sutures, and tergites 12 (13) – 20 with lateral marginations incomplete or nearly complete (Figs 2 E, 3 A, B). Sternites 3 – 20 with complete paramedian sutures (Fig. 2 C, D). Coxopleuron with 1 apical, 2 subapical, and 1 lateral spine, without dorsal spine (Fig. 3 D). Leg 1 with prefemoral and femoral spurs (Fig. 2 B). Ultimate legs (Fig. 3 C, D) long and slender, with ratio between the length and width of prefermur 4.5: 1; prefemoral spines on ultimate leg: 4 VL, 2 – 3 VM, 3 – 4 M, and 1 – 2 DM spines.

Distribution. This species has only been recorded in Southeast Asia, including Thailand, Laos, Cambodia, and Vietnam (Tran et al. 2013; Siriwut et al. 2018). In Vietnam it was recorded from Ha Nam Province (Phu Ly) and Ca Mau Province (Attems 1930; Tran et al. 2013), and Ba Ria – Vung Tau Province and Dong Thap Province in this study. The distribution of A. calcaratus was further updated (Fig. 1).