514 rSOCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



Tn addition to the characters j?iven above, one should look for specific 

 diiterences also in the form of the orbits, size of the eyes, direction and 

 depth of the dorsal sutures, chanicter of the lateral indentiitions, form 

 of the abdomen of the male, and of the chelic and ambuliitory \e,gs. 



The new species here made are based not on one character but on 

 several. 



DESCKII'TIONS OK NKW .Sl'ECIKS OK I>SEUI)OTIIKLPHU8A. 

 PSEUDOTHELPHUSA EXILIPES, new species. 



Front without superior margin; width of carapace less than 1^ times its 

 length; outer marijinofmerus of majilliped convex; amhulatory legs slender. 

 Carapace covered with puncta; visible to the naked eye and fine 

 reticulating furrows seen only with the lens; granulate near antero- 

 lateral margins. Cervical suture very broad in its inner half, narrow- 

 ing outwardly, its posterior margin curved, anterior straight, hjpigastric 

 lobes narrow, separated by a well-marked gioove. 

 Front (fig. 1, b) without a defined upper margin; 

 the outline of the upper portion in a dorsal view 

 is nearly straiglit; lower border marginate, sin- 

 uous, slightly visible in a dorsal view, median 

 ^ ^^ ^ and lateral lobes about equally deflexed. The 



Fig. 1.— PSECDOTIIELPHUSA . TIP/..! 1 •. • 1 i.1 iT i. 



Exiui'Ks, lOKMALE. «. MAX luucr luilf of ths orbits IS longer than the outer 

 iLLiPEi), X 2*. h. Front, half; the superior margin seen from above slopes 



denticulate, and with a hepatic tooth. Exognath 

 reaching about three-fourths the length of the ischium of the endognath 

 (fig. 1, a). 



Chelipeds very unequal in the female, covered with scaly granules; 

 palm of larger cheliped with very convex margins; fingers slender, 

 gaping, armed with irregular teeth (fig. 1, c); in the smaller cheliped the 

 margins of the palm are slightly convex and the fingers do not gape. 

 The ambulatory legs are very narrow; meri about 3h times as long as 

 wide; the pro])odi have straight margins, except in the last pair, where 

 they are slightly convex. 



Dimensions. — Female: Length, 14.4 mm.; width, 24.2 mm. 



Type. — No. 19488, U.S.N.M. ; one nuiture female; El Coronel, Costa 

 Eica, 700 meters altitude; P. Biolley and \^. Fernandez, collectors. 



Additional specimens. — Two females, about the size of the type, are 

 in the British Museium, associated with P. tumimamis, but without 

 label of locality. 



PSEUDOTHELPHUSA AGRESTIS, new species. 



Front without superior margin; lower margin sinuous, rimmed; outer 

 margin of merus of maxilliped convex; exognath reaching about one-half 

 the length of the ischium. 



Cara])ace smooth, punctu' visible to the naked eye. Cervical suture 

 deei), concave forward for the most i)art, outwardly straight, not con- 

 tinued to the margin. Median suture deep; epigastric lobes well 



