210 Bulletin, Vanderhilt Marine Museum, Vol. II 



Color: The body of the crab is mottled brown, salmon and rosy 

 flesh-color with a median longitudinal stripe of bright light blue ; the 

 under side of the body is pale blue. The legs are ringed with reddish- 

 brown alternating with bands of light rose pink; on the under side 

 they are entirely pinkish. 



Material examined : One male, taken from pond in the middle of 

 Sand Key, Dry Tortugas, Florida, November 27, 1923, by William 

 K. Vanderbilt. 



Technical description: Carapace oval, thin, flattish, disk-like, 

 slightly longer than wide; regions feebly delineated; upper surface 

 finely punctate and with an exceedingly fine coating of minute setae, 

 a few widely separated low flat tubercles. The front, antennular and 

 preorbital angles and epistome are all deeply, sharply spinose. The 

 frontal region between the antennae is narrow, approximately twice 

 as long as wide proximally, armed with a pair of acute forward point- 

 ing spines, one on each side midway the lateral margin, beyond which 

 the rostrum abruptly narrows and curves downward and terminates in 

 two acute, upcurved spines which are separated by a V-shaped space. 

 There are three or four spinules on the proximal half of the rostral 

 margin. The preorbital angle also terminates in a sharp, upcurved 

 spine, equal to and in line with the distal rostral spines. Behind this 

 on the preorbital margin is a second acute, up-pointed spine in line 

 with and equal to the subdistal spine of the rostrum ; a third smaller 

 spine occurs behind the second ; the outer half of the superior orbital 

 margin is serrate with eight or nine small teeth ; the postorbital angle 

 is an acute tooth; behind it on the anterolateral margin are three 

 subequal and subequally spaced acute teeth ; the posterior lateral mar- 

 gin is slightly carinate. The epistome is armed with five acute spines ; 

 the submedian pair being slightly smaller than the other three; the 

 outermost pair are visible dorsally and the median one would be 

 except that it lies directlj'' beneath the rostral horns. 



The external maxillipeds have the ischium very large, subrectangu- 

 lar, with the inner angles rounded; its width about three-fourths of 

 its length; the merus is very small, decidedly narrower than the 

 ischium and set obliquely upon it; the palp is rather long, slender, 

 conical, tapering and set with spinose setae, as is also the inner lateral 

 margin of the merus and ischium. The exognath is rod-like, very 

 slender, extending barely more than half the length of the ischium. 

 The male belt is triangular, with the tip rounded; segments three to 



