292 PROCEEDINGS OF THE NATIONAL MVSEtJM. vol. xxvi. 



Genus UROPTYCHUS Henderson. 



KIOV TO TilE Sl^KC'lES OF ITROFrYCHUS KXAMINEl). 



11. Lateral margin of the rarapace armed with spines or spiuules. 

 h. Merus without spines, except at the articulation with the carpus. 

 <\ Rostrum but little longer than the eyes. 



(1. Gastric region smooth armatus, ]>. 330 



ih Gastric region rough scandens, j). 29S 



r. Rostrum about twice the length of the eyes gmnulatm, ]>. 293 



h. Merus spiny. 

 c. Spines on the merus few. 



(7. Rostrum broad, triangular, not twice as long as the eyes minutus, p. 296 



d. Rostrum about three times the length of the eyes npiniger, p. 298 



c. Spines on the merus numerous. 



d. Without spines on the gastric region bellm, ]). 331 



d. With spines on the gastric region. 



e. Spines on the lateral margin short and stout puhescens, p. 332 



e. Spines on the lateral margin long and slender. 



f. Chelipeds long and slender; spines on the crest of the palm larger and 



more numerous than those of the lower margin spinomM, p. 333 



/. Chelipeds stout, with spines of the crest and lower margin longer and 



about equal in size and number jmnceps, ]>. 296 



a. Lateral margin of the carapace unarmed. 

 h. Carapace and legs densely spinulose (including lateral margin) ..riujosm, p. 333 

 /;. Carapace not spinulose. 



(,'. Carapace pubescent capillatus, p. 293 



c. Carapace not conspicuously pubescent. 

 d. Rostrum about twice the length of the eyes. 



e. Cornea not larger than the eyestalk .jamaiceiisis, p. 294 



e. Cornea spreading, much larger than the eyestalk nitidus, p. 332 



d. Rostrum not twice as long as the eyes. 



e. Rostrum cylindrical brevix, p. 292 



e. Rostrum flat, triangular. 



/. Outline of hands arcuate on both margins vndfer, j). 333 



/. Outline of hands straight on both margins. 



g. Rostrum longer than eyes occidentalis, p. 332 



g. Rostrum much shorter than eyes scaiiihus, \>. 297 



UROPTYCHUS BREVIS, new species. 



The rostrum is short, subcylindrical, and blunt. The only armature 

 of the carapace is at the antero-lateral angles, from which a fingerlike 

 tubercle extends directly forward. 



The carapace is remarkable for its dimensions, being much broader 

 than long; the l)roadest portion is near the posterior margin; the 

 front is about one-half the breadth; the sides are immarginate. 



The merus of the maxillipeds is unarmed. The merus of the cheli- 

 ped is cylindrical, armed at the distal upper angle with a single small 

 spine; the carpus is a little compressed, Avith a row of 5 small tuber- 

 cles on the upper margin and a spine and 2 tubercles on the distal 

 -border. The palm is compressed to a thin crest above; the crest is 



