NO. 2030. NEW SPECIES OF CRABS— RATHBUN. 357 



transverse (somewhat sinuous and slightly sloping backward to the 

 outer tooth); the sides of the carapace subparallel along the lower 

 margins, upper margins convergent posteriorly; a blunt-pointed 

 triangular antero-lateral tooth, followed by a triangular sinus, 

 behind which the carapace attains its greatest width; surface rough- 

 ened by short rugose lines from which arise short setae; some of the 

 rugae, as on the postbranchial region, are granulous. Front at 

 greatest or superior width, over one-fourth as wide as the carapace; 

 margin arcuate, bordered by a smooth raised line; surface with a 

 broad longitudinal groove. A transverse raised line parallel to the 

 posterior margin; close behind the ridge there is a row of punctae. 



The merus of the maxilliped projects laterally beyond the outer 

 border of the ischium, and bears an L-shaped groove anteriorly. 

 Chelipeds about twice as long as carapace; carpus short, the four 

 sides of its dorsal surface subequal, inner angle rounded; palm 

 higher than its horizontal length, and longer than the fingers, nearly 

 smooth, upper margin finely granulated; above the lower margin a 

 prominent crest extends the length of the palm and finger; lower 

 edge of propodal finger horizontal, bimarginate; the prehensile edge 

 of the dactylus has a long, low prominence on its basal half; the 

 opposite surface of the fixed finger is deeply channeled. Merus 

 joints of the first three legs broad and furnished with a tympanum 

 occupying more than half its length; dactyli nearly as long as pro- 

 podi. 



Fu'st segment of male abdomen subequal in width (or transverse 

 dimension) to third, anterior margin concave; second segment sub- 

 equal in length to first, both measured on median line, and shortened 

 at each end to a minute round lobe; third and fourth segments of 

 equal length, sides separately arcuate, the fourth segment narrower, 

 fifth a little broader than long, strongly constricted near the proxi- 

 mal end; sixth subrectangular, broader than long; seventh triangular 

 with tip rounded. 



Difters from T. stapletoni in its wider carapace; front rounded 

 instead of angled; palm with a strong ridge on outer surface; finger 

 with a basal prominence; and in the different proportions of the 

 abdominal segments. (See de Man's fig. 1 d.) 



