64 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



(?. Carapace as long as, or longer than, wide. 



D\ Dactylus of fourth leg of different shape from the others; that is, al- 

 most straight, except for a slender, curved, horny tip moscri, p. 94. 



D*. Dactyli of all legs similar, falcate. Size small. 



E*. No dorsal median groove on frontal region. Legs 1 and 4 sub- 

 equal, shorter than 2 and 3, which are subequal. Two cardiac 



tubercles side by side tuylori, p. 97. 



E'. A dorsal median groove on frontal region. Legs diminishing from 



1 to 4 shoemakcri, p. 93. 



B*. Dactylus of third leg considerably longer than that of other legs. 



lithodomi, p. 73. 

 A*. Palpus of outer maxilliped large, nearly or quite half as large as merus. 

 B'. Dactylus of outer maxilliped either oblong or subspatulate, less than two- 

 thirds as long as propodus. 

 C*. Carapace wider than long. 

 D'. Carapace suborbicular, pubescent ; front a little produced. 



maculntm, p. 74. 

 D'. Carapace nearly square, with rounded corners, naked ; front not pro- 

 duced nudus, p. S3. 



C*. Carapace as long as, or longer than, wide. 



D*. Dactylus of fourth leg much longer than that of the other legs. 



rcticnlatus,'p.i)3. 



T>'. Dactyli of legs similar, falcate couchan(m,\\SQ. 



B*. Dactylus of outer maxilliped spatulate, two-thirds as long as propodus. 

 C*. Hands short, bare. Carapace nearly one and a half times broaden- than 



long gncrini, p. 101. 



C Hands elongate, strongly ciliated on lower margin hirtiiiianns.i). 101. 



A*. Females not known bipuncfuHis, p. 78; dcprcssus, p. 79; orcntti,Y).OS; 



muliniurum, p. 81 ; hemphiiU, p. 99. 



KET TO MALES OB" AMERICAN SPECIES OP THE GENUS PINiXOTHEUES. 



A*. Carapace wider than long. 

 B\ Dactyl of last leg unlike the other three, being long and straight instead 



of short and curved maiyarita, p. 91. 



B*. Dactyl of last leg not very unlike the other three. 



CV Carapace octagonal. Sternum sharply cristate hemphiUi, p. 99. 



C'. Carapace suborbicular. Sternum not sharply cristate, 



D\ Anterior half of carapace thickly margined with hair. Posterior 

 margin transverse, rimmed. 

 E\ Carapace convex. Propodus of fourth leg not remarkably dilated. 



Eyes moderate concharum, p. 8G. 



El Carapace flat. Propodus of fourth leg broadly oval. Eyes very 



large depressus, p. 79. 



D*. Anterior half of cai-apace not thickly mai'gined with hair. 

 E*. Cjyapace widest at middle. 



Fl Front strongly produced. Two large punctae near middle of 



carapace bipunctutus, p. 78. 



F*. Front slightly produced. No large punctae near middle of 

 carapace vmliniaruin,ii. 81. 



