THE CANCROID CRABS OF AMERICA 485 



persisting. Outer surface of major palm of adult partly smooth and 

 bare. Three spines or spinules on edge of each frontal lobe. 



Description. — Carapace about three-fourths as long as wide, ante- 

 rior half semicircular, strongly deflexed, posterior half with sides con- 

 stricted. Dorsal surface with a thin coat of short downy hair inter- 

 spersed with many long stout hairs with pointed tips ; hair scanty on 

 posterior third. When the hair is removed the fine granular hair 

 sockets are revealed, forming a rough surface. On the hepatic region 

 are two long curved dorsal spines with sometimes 1, 2, or 3 supple- 

 mentary spines, and one long spine just below the lateral margin 

 between the first and second marginal spines. The marginal spines 

 are four in number, including the outer orbital spine. Orbit armed 

 with 3 long spines above and 4 long and 2 or 3 short spines below, 

 the short ones between the 2 outermost long ones. Front advanced; 

 median sinus large, its sides converging, apex rounded; lobes bordered 

 with three principal spines shorter than those described above; at 

 outer angles of front a single long spine^ 



Chelipeds and legs clothed with long hairs similar to those on the 

 carapace and also some short hairs. Chelipeds very unequal, the 

 major palm of the adult male half again as high as the minor palm. 

 Upper margin of merus armed with a few small blunt spines and at 

 the end with two large curved spines, distal and subdistal. Carpus 

 and dorsal aspect of manus of major palm armed with dark spines, 

 those of the manus arranged more or less in longitudinal rows and 

 becom ng pointed tubercles lower down on the surface; the smooth 

 area of the outer palm may exceed the spined area, from which it is 

 separated by an oblique line, or it may be very much reduced as in 

 smaller specimens and in females. In the minor palm the spines 

 very nearly cover the outer face (entirely cover it in small specimens) 

 and the conical tubercles outnumber the spines. Lower edge of 

 palms obscurely tuberculate, convex in major palm, only slightly so 

 in minor palm, lower edge of the whole propodus sinuous, fingers 

 deflexed, tips curved upward; major finger a little longer than basal 

 height. Movable fingers with a few conical spines and tubercles in 

 3 rows above near base. On the ambulatory legs the spines on the 

 upper margin of the merus are small, slender, and approximate; 

 those of the carpus and propodus are long and dark and disposed in 

 two rows; horny tip of dactyl slender and dark. 



Color. — Grayish brown irregularly suffused with red ; spines mostly 

 black, hairs yellow. (Hay and Shore.) 



Measurements. — Male (12472), length of carapace including spine 

 21.8, width including spines 29, width excluding spines 25.5, fronto- 

 orbital width 19, width of front including outer or antennal spines 

 8.8 mm. 



