572 Monograph of the 



The chelipeds are nearly the same as in hastatns, and 

 have the same development of spines on the different 

 joints ; they are, however, a little longer, and the lamelli- 

 form projection on the trochanter that laps over the coxal 

 joint is smaller and more rounded. There is only one 

 spine on the carpus of the ambulatory feet, with numerous 

 little spiniform projections ; on the third pair only the 

 small spiniform projections appear to be present. 



This species is easily recognized, and can in no way be 

 confounded with hastatus. The great difference in the in- 

 tromittent organs, the very narrow and almost straight 

 abdomen of the male, with the striking narrowness of the 

 cardiac and intra-medial regions of the carapax, enable us 

 to distinguish this species without difficulty. 



It is lightly and brightly colored, and extremely different 

 in that respect from hastatus. But I have only an imper- 

 fectly colored drawing, from which I would not attempt a 

 description of the colors. 



I have not had before me such an immense mass of 

 specimens of this species as of hastatus, and of course have 

 not been so well able to trace the growth and variation of 

 the species. 



A small specimen from Texas, apparently belonging to 

 this species, has the posterior tooth of the antero-lateral 

 border perfectly straight, without curving at all forwards 

 as it generally docs. It also has a faint trace of a devel- 

 opment of two extra spines on the carpus of the chelipeds. 



I have seen but one female of this species, and in that 

 the carapax is much more convex than in any of the males. 

 Out of nearly one hundred specimens of this species from 

 Tortugas, there was not a single female. 



Its geographical distribution is different from that of 

 hastatus, being much more southern. Specimens in the 

 Museum of Comjmrative Zoology are from Cumana, 

 Capt. Couthouy ; Ilayti, A. Ililchenbach ; Bahamas, Dr. 



