191 



4-jointed, two and a half times as long as head; joint 1, two- thirds as long as ante- 

 rior femur, stout, swollen at middle, with some sparse hairs ; beneath, slightly beyond 

 middle, armed with a strong truncate spine and a little before this spine with a tuft 

 of stiff bristles; joint 2, not quite as long as thick, armed with an acute spine at the 

 extreme base below; joint 3, rather strongly curved and slightly twisted, basal 

 three-fourths cylindrical, apical one-fourth enlarged, with a pale oval disc or cushion 

 beneath, its margin surrounded by several bristles; joint 4, rather more than one- 

 half as long as 3, acute at tip and giving off a short tubercle below, a little beyond 

 middle. Thorax aud abdomen together subovate-acuminate, a little more than three 

 times as long as wide; pronotum large, transverse, three times as wide as long, with 

 posterior angles rounded ; mesouotum three times as long as pronotum ; metauotum 

 not visible from above. Abdomen conical, with lateral margins slightly refiexed, 

 and terminating in a conical point; at base nearly as wide as thorax; joint 1 occupy- 

 ing nearly one-third of the surface; 2 to 8 short, subeqnal; 9 longer, conical. Ante- 

 rior legs short, stout, pubescent ; femora slightly longer than tibiic and tarsi together, 

 fringed beneath with a single row of black bristles; tibia}, about half as long as 



Fig. 19.—liheumatobates rileyi—teratde imago, witli the hind tarsus enlarged; a, tarsus of foreleg; 

 b, anal segment from below — still more enlarged (Heidemann, del.). 



femora, with three or four long bristles beneath; tarsi short, 2-jointed, about two- 

 thirds as long as tibia?, joint 1 one-half as long as 2, last joint emarginate beneath a 

 little before apex, from which emargination issues a single black claw ; from base of 

 claw springs a stiff bristle which could be mistaken for a second claw. Middle legs 

 much the longest, cylindrical, tapering toward tarsi, fully four times as long as ante- 

 rior pair, or one-fourth longer than posterior pair; femora, one-fourth longer than 

 tibiae, fimbriate, with long hairs beneath; tibia?, with only basal half fimbriate, 

 hairs usually hooked or curved; tarsi, about one-third shorter than tibiae, 2-jointed, 

 joint 1 about twice as long as 2, the latter emarginate beneath at about basal one- 

 fourth, with a single claw and a bristle. Posterior legs with femora stout, strongly 

 curved, and acutely produced at apex beyond articulation of tibia;, tip furnished 

 with several long hairs ; a little before tip is a spine-like process or prong, with a tuft 

 of bristles near base; basal, third of femora within with a row of long hairs; joint 

 2 of trochanters large, densely hairy above and below ; tibite, subclavate, articulating 

 9673— No. 3 4 



