NO. 13C1. RE VISION OF AM ERIVAy j-iiriWSAPTEIiA-BAKER. 387 



d Hind tarsal joint I about equalling II and III together, rarely little more; 



never with a spine on apex of joint I of hind tarsi which exceeds jonit II; 



head always with a distinct notch on the front. 



e. Abdoniinai tergites with \\ distinctly marked rows of unusually numerous 



bristles; labial palpi nearly equalling anterior femora. 



f Frontal notch so reduced as to be almost absent; pronotal ctenidium 



■ ' „f t went v-f« .ur spines ahskemi.« ( p. 'm ) . 



(/•. Frontal notch very distinct; pronotal c'tcnidivim of eighteen to twenty 

 spines. 

 g Frontal notch normal; antepygidial bristles, two on each side and ot 



about equal length hirmlus (p. 392). 



gg Frontal notch with the upper lip in the form of a strong tubercle; 

 antepygidial bristles 3 on each side, the inner quite small, the 



middie^ largest tubercidatus (p. 393) 



ee Abdominal tergites each with two normal transverse rows of bristles. 

 /. Hind tarsal joint II with apical spine scarcely exceeding joint III or 

 shorter. . 



n Lateral spines on last joint of hind tarsi with hrst pair distm<-tly 

 dislocated toward median line, not merely bent inward, and 

 always so on middle and fore tarsi. 

 h. Abdominal sternites with always more than two bristles on each 

 side on at least five segments. 

 i. Hind femora with a longitudinal row on side of a number of 

 bristles; pronotal ctenidium of eighteen spines. 

 j. First joint in middle tarsi distinctly longer than second or 

 fiftli; female stvle with a single very minute bristle on upper 



gj^g ' _" nilifornicus (p. 395) 



jj. First joint in middle tarsi about equal in length to second, 

 and also to fifth. 

 k. Labial palpi scarcely equalling anterior coxie. 



ocidatiis (p. 39b). 



kh Labial palpi slightly exceeding anterior coxa?. 



cihatus (p. 39/). 

 a. Hind femora without a longitudinal row of bristles on side, 

 though one or two may occur there. 

 j Pronotal ctenidium of twenty-four to twenty-six spines. 



k Upper clasper of male with one black tooth at upper and 



one at lower end psnukirrtomys (p 399) 



kk. Upper clasper of male with two black teeth at middle of 



hindn.argin iW (p 400). 



jj. Pronotal ctenidium of sixteen to eighteen spines; labial palpi 

 eciualing or shorter than anterior coxa\ 

 k Fifth joint of middle tarsi much less than twice length of 

 fourtb, the second longer than fifth, and the first litt e 



longer than third leucopns {p. m . 



kk Fifth joint of middle tarsi always twice fourth in length or 

 more, and other proportions different from above. 



I Labial palpi abnormally slender labUdus (p. 401.) 



II. Labial palpi normally stout. 



m. Upper male daspers each witli four black teetli 



^^ inckhuiiii (p. 40.-.). 



mn,. Upper male clasp.MS .a.!, with six black teeth. 



hh. Abdominal sternites with but two bristles on each ^^'^^^^ 



claspers of male each with three stout bhuk t.-eth on expande^l 



middle portion of hind margin ««9»vn (p. 40o). 



