THE SPIDER CRABS OF AMERICA 343 



Milne Edwards placed under granulosus has the general appearance 

 of his simplex, but with two spines on the antennal article. 



The figure of granulosus given by A. Milne Edwards, which is 

 copied here, does not show the few, extra large tubercles on the cara- 

 pace which are present in the type. In his figure of simplex, also here 

 reproduced, the posterior spine of the carapace is exaggerated and the 

 dorsal spines are represented more spinous than they really are. 



It is extremely likely that the simpUx form (of which 3 males are 

 known) is the male of granulosus, of which only a female is known 

 and was taken in the same haul as the type male of simplex. 



Genus THERSANDRUS Rathbun 



Sisyphus Desbonne, in Desbonne and Schramm, Crust, de la Guadeloupe, 



1867, p. 20, pi. 3, figs. 11 and 12; tj^pe, S. compressus Desbonne. — A. 



Milne Edwards, Crust. R^g. Mex., 187S, p. 123. Not Sisijphus Latreille, 



1825, a genus of Coleoptera. 

 Thersandrus Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, p. 164; 



type, T. compressus (Desbonne). 



Carapace ovoid-oblong, depressed, covered as well as the feet, 

 with short, brownish setae. Front formed of two rostral horns. 

 Preorbital spines wanting. Orbits deep and tubular; upper border 

 cut by a deep fissure; ocular peduncles very slender. Basal article 

 of outer antennae remarkably wide and so united to the carapace 

 that it closes the orbit below; the first movable article is large, a 

 little fiat and almost as long as the rostrum; next article more slen- 

 der but well developed; flagellum small. Antennular fossae wide 

 behind, very narrow in front. Outer maxillipeds wide; merus auri- 

 culate at its autero-external angle and deeply cut at the inner angle 

 for the insertion of the palp; exognath narrow. 



Chelipeds of male symmetrical, little swollen; fingers touching 

 onl}'^ at the extremities, which are not spoon-shaped. Ambulatory 

 legs folded forward, the dactylus very slender, very hooked, very 

 sharp and strongly folded under the propodus. Abdomen of male 

 composed of seven distinct articles. 



Contains only one species. 



THERSANDRUS COMPRESSUS (Desbonne) 



Plate 248, figs. 1-8 



Sisyphus compressus Desbonne, in Desbonne and Schramm, Crust, de la 

 Guadeloupe, 1867, p. 20, pi. 3, figs. 11 and 12 (type-locality, Moule, 

 Guadeloupe, among algae; cotype in Paris Mus.).— A. Milne Edwakds, 

 Crust. R6g. Mex., 1878, p. 124, pi. 24, figs. 1-1/;. 



Diagnosis. — Carapace depressed. Rostral horns small. Anten- 

 nae and ambulatory legs fringed with long hair. 



Description. — Regions of carapace little marked, surface almost 

 smooth. The gastric region shows indications of four tubercles, the 



