NO. 1158. 



FRESH-WATER CRABS OF A MKinCA—RATHBUN. 



523 



Carapace slightly com vox; the gastric region is a little elevated, the 

 branchial less so. The protogastric lobes are prominent and are con- 

 tinued laterally in a faint ridge to a point behind the bas<5 of tliceye 

 stalk (lig. 14,/>). The depressions defiMing the anterior part of the 

 inesogastric region are distincit. Median furrow very deep. Cervical 

 gioove straight, deep, and continued nenrly to the lateral margin. 

 Anterior and lateral portions of the carapace covered with (ioarse 

 scabrous granules. Lateral margins finely dentate, with traces of two 

 larger indentations between the orbit and tlie cervical suture. Front 

 low (lig. 14, tt); superior margin convex, bilobed, tuberculate, slightly 

 projecting over tlie vertical surface, and in a front view slightly concave 

 or depressed in the middle; h)wer margin prominent, tuberculate, sinu- 

 ous, i)artially visible in a dorsal view in small specimens. Orbit nearly 

 filled by the eyes and with tuberculate margins, the superior margin 

 sinuous. The outer margin of 

 theendognath of the maxillipeds 

 is convex (fig. 14, //); the ischium 

 is narrower at its distal end than 

 behind that point; the merus is 

 rather short and broad, and has 

 a regularly arcuate an tero- lateral 

 margin. The exognath is very 

 short, being reduc(Kl to a stump. 



The merus of the chelipeds is 

 rugose above, the inner margin 

 is armed with stout teeth gradu- 

 ated in si/e; the lower and distal 

 margins of the inferior surface 

 are marked by small and regular 

 bead granules. Carpus rugose; 

 inner tooth acute. Larger pro- 



podus stout (tig. 14,/), upper margin slightly convex; lower margin 

 convex except for a slight sinus beneath the base of the i>ollex ; surface 

 covered with scattered scabrous granules; a large irregular tubercle at 

 the base of the union of the fingers. Fingers broad, deeply punctate, 

 punctai in longitudinal rows; i)rehensile edges in contact or nearly so, 

 and furnished with broad teeth. The smaller proi)odus differs in hav- 

 ing the margins subparallel, and in huving less heavy teeth on the fin- 

 gers. Merus Joints of ambulatory legs flattened, with upper margins 

 convex and sharply denticulate. Superior margin of carpal and both 

 margins of propodal Joints spinulous. These joints in the last i)air are 

 rather broad. The dactyli are slender. 



IHmenHvmH. — Type, female: Length, 17.1 mm. ; width, U(5.8 mm. ; exor- 

 bital width, 17.1 mm.; width of front below, 7 mm.; above, 8 mm.; 

 depth, 0.7 m. l^^emale, Antilles: Length, 38 mm.; width, ({.'i mm.; exor 

 bital width, 35 mm.; width of front below, 15.8 mm.; above, 17,7 mm.; 



FlO. 14.— PSKUUOTHELI'iniSA OAIIMANI. a. FRONT, 

 X Vi. b. ANTIlilllOU OUTLINK, X IJ. C. AnDOMILN, 

 MAI.K, NA'IUHAL SIZE. d. l.KFT AMDOMINAI. Al'- 

 I'UNUAdi;, MAI.K, INNKll VIEW, X 10. c. 'I'llK HAMK, 

 LOWKll VIICW, X 10. /. LAHOKH OIIICI.A, KUMAl.K, X 



14. g. Maxilliped, x IJ. 



