NO. 1158. 



FRESH-WATER CRABS OF AMERICA— RATHBUN. 



527 



Fig. 17.— PHECrjOTHEI-PHUHA IMTTIEKI, 

 MALE. a. FBONT, X 1|. h. Lartieb 

 CHELA, X IJ. C. MAXILLIPED, X 2. 

 rf. Left ABDOMINAL APPEWDAOE, LOWER 

 VIEW, X 3. 



suture strongly curved, concave forward, as in hocotirii, but more trans- 

 verse than ill that spe^jies. Front (sae fig. 17, U). Orbits (fig. 17, a) nearly 

 transverse in a front view, suboval. Abdominal appendages similar to 

 those of jouyi, americana, terrestris, ate. 

 (fig. 17, d)', extremity with a large, 

 rounded, inner lobe, and a pointed t<^)oth 

 directed forward at the antero-external 

 angle. Fingers of chelipeds slightly gap- 

 ing (fig. 17, h). Meral Joints of ambula- 

 tory legs dilated in the middle. 



iJimensions. — Male: Length, 12..'j mm.; 

 width, 19.0 mm. Female: Length, 17 

 mm.; width, 27.5 mm. 



Habitat. — Costa Rica: Agua Buena, 

 type locality; Java, one female. The specimens are the gift of Mr, n. 

 Pittier, director of the Physical-Geographical Institute of Costa Pica, 

 for whom the species is named. 



Types. — No. 21243, U.y.N.M.; two males, two females; Agua Buena. 



PSEUDOTHELPHUSA PERUVIANA, new species. 



Superior margin of front keeled^ carapace coarsely granulate; merux of 

 maxilliped xuhtriangnlar ; abdominal appcndageff horizontally comprenffcd. 

 A narrow species, with advanced front. Carapace covered with 

 depressed, crowded granules, larger near the margin; jjuncta- incon 

 spicuous. Cervical suture a single curve, concave, forward. Antero- 

 lateral teeth well marked, but small. Median suture very deep, (tutting 

 the superior frontal margin. This margin is arcuate in a single curve, 

 ending above the base of the eyestalks, tiiberculate; in a front view it 



bends down toward the middle (fig. 18, a). 

 Lower margin projecting beyond the ui)per, 

 tuberculate, strongly sinuous, tliree lobed, the 

 middle lobe reaching farther down than the 

 lateral lobes, which are subtriangular. Side 

 margins of front nearly vertical. Orbits 

 about as wide as one-half the front, rather 

 deei>, nearly filled by the eyes. Abdominal 

 appendages tv» isted, terminal third lainelli- 

 form, com])re8sed horizontally (fig. 18, e). 

 Maxillij)ed (fig. 18, c) with exognath short, 

 about one half length of ischium. The ischi- 

 um is a little narrower at the distal end than 

 behind that point; menis su))triangular, outer 

 margin very slightly (;onvex. Chelipeds gran 

 ulate, not very unequal. Merus stnmgly 

 toothed on inner margin; feebly tuberculate on lower and distal mar- 

 gins of inner surface. Hands convex above and below. Teeth of 

 fingers subtriangular, as a rule large and small alternating and dove- 



r^^^^ 



FlO 18.— PSEUDOTHELPHUSA PE- 

 RUVIANA, .MALE. a. Front, x IJ. 



I). LARTiER CHELA, X IJ. C. MAX- 

 ILLIPED, X SJ. d. ABDO.MBN, X 

 li- e. LEKTABDO.MINAL APPEND- 

 AGE, lyjWER VIEW, X 4. 



