DESCRIPTIONS OF GENERA AND SPECIES. 219 



spine, but gradually fades into a circular form like that 

 of ordinary spines. There are four pairs of similar but 

 rather smaller and rounder-ended spines near the posterior 

 margin, and projecting considerably beyond it; the 

 central pair is the smallest. There are also a pair of 

 ordinary hairs a little behind the cephalothorax ex- 

 tending nearly half the length of the abdomen, and a 

 much shorter, more spine-like pair, distant from the 

 posterior margin about one-third of the length of the 

 abdomen ; also a long pair on the posterior margin. 

 Legs of moderate length ; about half the tarsus of the 

 fourth pair passes the posterior margin of the body. 

 The two anterior pairs are much thicker than the two 

 posterior, and are usually turned somewhat backward. 



The anterior pairs (fig. 8) bear three pairs of stout, 

 curved spines, and a rounded chitinous knob near the 

 distal end of the tarsus; two pairs, one of which is 

 larger than the other, about the middle of the same 

 joint ; and one large unpaired spine near its proximal 

 end ; there is also a spine on each femur, genual, and 

 tibia. The claws are long, strong, and only slightly 

 curved; there is a long flexible hair just behind the 

 claw. The posterior legs have fewer spines and a 

 shorter hair by the claw. There are the usual two 

 pairs of discs on the ventral surface ; one pair, widely 

 separated, about opposite the middle of the anal open- 

 ing, and the other pair near together between the ends 

 of the fourth epimera. The first pair of epimera are 

 joined to the sternum; the second meet, or nearly meet, 

 in the median line; the third and fourth are free. 

 There is a pair of short hairs between the first and 

 second epimera, another between the third and fourth, 

 another close to the outer sides of the anterior pair of 

 discs, a pair opposite the penial sclerites, and two pairs 

 by the anus. 



Female differs from the male in having on the 

 notogaster ordinary stiffish curved hairs, not thick 

 ensif orm spines like those of the male ; and not raised 

 on papilla, but only surrounded by the ring common 



