THE SPIDEB CRABS OF AMERICA 481 



Macrocoeloma sw6poraZZeium Rathbun, Bull. U. S. Fish Comm., vol. 20 for 

 1900, pt. 2 (1901), p. 74. 



Diagnosis.^A row of seven short spines or sharp tubercles on the 

 dorsum between the postero-lateral angles. Posterior part of cara- 

 pace eroded. Rostral horns subparallel. 



Description. — -Carapace broad, triangular, covered with a short, 

 vesicular pubescence. A band of curved hairs extends from tip of 

 rostrum to middle of branchial region; a similar band on antero- 

 lateral margin. A sharp tubercle on mesogastric region. Posterior 

 third of carapace finely eroded. Protuberances at lateral angles 

 triangular, flat, acute; between them a row of five protuberances, of 

 which the submedian pair is small, and the median one is high and 

 occupies the cardiac region; a smaller median spine or tubercle on 

 the intestinal region. Rostrum about one-fourth as long as entire 

 length of carapace, the horns connected behind by a thin expansion 

 of the front, subparallel or sometimes divergent, and widely separated 

 by a more or less U-shaped sinus; this sinus is devoid of crispate 

 setae. Orbital tubes directed obliquely outward and forward, the 

 preocular spine acute, stouter but less advanced than the spine at 

 the antero-internal angle of the basal antennal segment. The an- 

 tennal spine is visible in dorsal view, but the peduncle is hidden by 

 the rostral horns. 



Chelipeds very strong in the adult male and as long as carapace; 

 two rows of tubercles on outer surface of arm and wrist, one row on 

 palm; palms broad, compressed; fingers stout, unevenly gaping 

 except at the dark brown, crenulated tips; dactylus with a shallow 

 subbasal tooth. 



Abdomen and sternum of both sexes sculptured. 



Color. — Brownish-yellow (Desbonne) . 



Measurements. — Male (48666), length of carapace 34.3, length of 

 horn 8.1, width of carapace between tips of postero-lateral laminae 

 29.5 mm. Male (Scliramm), length of carapace 41, width between 

 tips of postero-lateral laminae 36. Female (24200), length of cara- 

 pace 31, length of horn 6.3, width of carapace 27.8 mm. 



Range. — West Indies; Caribbean Sea. 



Material examined. — 



Cuba; 1914; Henderson and Bartsch, Tomas Barrera Expedition: 

 Between Cape San Antonio and Cape Cajon; 2 to 12 fathoms; on 

 bottom varying from pure sand to weedy; May 24; station 12; 

 1 young (48741). Cabanas; June 8-9; station 16; 1 male (48666); 

 caught by copper sulphating on reef. 



Jamaica; specimens in Institute of Jamaica. 



Haiti; Dr. Weinland; 1 female (323, M. C. Z.). 



