252 CRUSTACEA OF THE UNITED STATES. [Maf. 



those spines are placed horizontally, and not, as in our 

 species, vertically, with respect to each other; the two 

 following segments, also, are deeply emarginate over the 

 insertion of the feet, but, in the species here described, 

 they are simply mucronate in that part, the anterior lobe, 

 which would form the notch, being wanting. 



The specific name is taken from Empusa in Ento- 

 mology, a genus of insects, which was separated by Mr. 

 llliger, from the Linnsean genus mantis, to which it has 

 as much affinity, as the Squillae here compared have for 

 each other. 



The S. empusa inhabits the coast as far south as 

 East Florida, it varies a little in colour. I here add a 

 description of the colours, &c. of a recent male specimen; 

 feet white, anterior onesy second and third basal joints 

 tinged with rosaceous and edged with yellow at their tips; 

 interior antence^ peduncles blackish, joints yellow at base, 

 seta white annulate with black; exterior ones, peduncles 

 dusky, seta white, scale yellow or greenish on the terminal 

 half, and indistinctly spotted with minute brownish- black 

 spots; segments of the body margined behind with darker 

 green and edged with yellow; tail tinged with rosaceous, 

 and varied with blackish and yellowish; lamellae ^'mntr ones 

 black, paler at base, outer ones, first joint black, base and 

 spines white, second joint yellow, inner margin black; 

 peduncle of the lamella elongated, terminating in two 

 white spines, of which the inner one is rather longer 

 than the inner lamella, slightly toothed on the middle of 

 its length, from whence a double groove proceeds to the 

 tip, a spine over the insertion of the first joint of the ex- 

 ternal lamella which has also a spine under the insertion 

 of the accessary plate; eyes cylindric, rounded at tips, 



