16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



male imperceptibility diflFerent from C. I. longulus (pi. ld,e,u; figs, 

 la,c-e,g). 



HoLOTYPE MALE, FORM I. — Body aboiit 1.5 times broader than deep. 

 Greatest width of carapace at level of midlength of areola (21.4 mm.). 

 Abdomen shorter than carapace (34.0 and 39.7mm.) and narrower 

 (16.0 and 21.4). Areola about 4.1 times longer than broad with six 

 punctations across narrowest part. Cephalic section of carapace 

 about 1.6 times length of areola. Areola about 38 percent of entire 

 length of carapace (figs. lb,h). 



Rostrum with thickened margins, without marginal spines or 

 tubercles, gently tapering, dorsally concave with deep punctations 

 scattered in caudally situated oval depression; rostrum with thick- 

 ened, cephalically converging margins forming an indistinct acumen 

 with upturned apex, a row of setaceous punctations along mesial base 

 of thickened margins. Subrostral ridges weak but visible along entire 

 length of rostrum in dorsal aspect. 



Postorbital ridges conspicuous, terminating cephalically in a small 

 corneous spine; grooves of postorbital ridges well developed and 

 bearing fine setae. Suborbital angle obsolete, replaced by a slight 

 rounded projection just above level of base of antenna. Branchioste- 

 gal spine reduced to a small angular prominence. Carapace without 

 lateral spines. Upper surface of carapace and lateral portion of 

 branchiostegites punctate. Few granulations on lateral surface im- 

 mediately caudal to cervical groove, but many on cephalolateral 

 regions. 



Cephalic section of telson with two spines in each caudolateral 

 corner. Epistome with a slight cephalomedian projection (fig. If). 



Antennules of usual form with a strong spine present on ventral 

 side of basal segment. Antennal scale broadest just proximal of 

 midlength, with outer distal margin terminating in a long, acute, 

 corneous spine. 



Right chela (fig. Ik) conspicuously punctate above and below, 

 flattened, and about twice wider than deep (20-10 mm.). Inner 

 margin of palm with single median row of nine squamous tubercles 

 scarcely rising above contour of margin; longitudinal row of deep 

 punctations present above and lateral to row of squamous tubercles. 

 Upper surface of palm with two large tubercular swellings at base of 

 dactyl. Immovable finger strongly convex laterally and without 

 well-defined grooves or ridges; proximal half subtriangular in cross 

 section, distal half ovate; basal portion almost as deep as wide; 

 opposable margin with a tuft of setae proximally and with a more 

 distal row of 16 rounded, corneous tubercles; larger tubercle present 

 just below tubercular row and slightly distal to midlength; a row of 

 minute denticles on distal third of opposable margin just ventral to 



