DESCRIPTIONS AND DETERMINATIONS OF SPECIES 21 



convex sides. Legs of the type common to the genus, the projection on 

 the tibiae of the third pair being extremely small or wanting. 



Abdomen large and stout. First segment very narrow, with two 

 spines ; second with one row of four ; third with two plates, the first 

 with four spines, the second with eight or nine ; all spines on these three 

 segments being very small and slender. Fourth to seventh segments with 

 three sclerites and three rows of fourteen to sixteen rather small and 

 slender but distinctly awl-shaped spines. Eighth with one row of twelve 

 similar spines, ninth with four very slender hairs. 



Pleurites of the first segment very small and tooth-like ; of the sec- 

 ond with a short dorsal tooth, and two short spines on the posterior mar- 

 gin and a rather short knife-like process on the ventral side. Pleurites 

 of the third to the sixth segments with a single long tooth at each pos- 

 terior angle, the posterior margin being slightly concave and bearing 

 two hairs. Pleurites of the seventh and eighth segments very small, each 

 with two long hairs. 



On the ventral side the first segment apparently lacking; the second 

 with one sclerite and one row of eight short spines ; the third to seventh 

 with three sclerites, each with eight to ten spines, except the first sclerite 

 of the third segment, which has the tw r o pairs of large spines character- 

 istic of the genus. In each of these pairs the spines are very close to- 

 gether and diverge but slightly. Last sclerite of the seventh segment 

 with very short spines. 



Genital plate with a number of small hairs, gonapods with three 

 small hairs, a group of three or four moderately large hairs behind each 

 gonapod, one very large hair and several small ones at each posterior 

 angle of the ninth segment. Anterior lip of the vulva fringed. 



Description of the Male. — Length .67 mm., length of head .16 

 mm., length of abdomen .47 mm., width of head .12 mm., width of tho- 

 rax .17 mm., width of abdomen .32 mm. Head, thorax and legs resem- 

 bling those of the female, the abdomen much smaller, slightly pointed 

 posteriorly, and with fewer sclerites than in the females. Third tergite 

 with two sclerites, remainder with one. Second sternite with one sclerite, 

 third with three, fourth to sixth with two, seventh and eighth with one. 

 The spines smaller and less numerous than in the female. Basal plate 

 rather short and slender, parameres stout, more than half as long as the 

 basal plate, penis with long slender point and diverging serrate arms. 



