296 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



1 male, 3 females; returned to sender. North end Bird Key reef; 

 "Channel reef"; Aug. 12, 1924; W. L. Schmitt; 1 female (59467); 

 gift of Carnegie Institution. Bird Key Reef; June 2, 1925; W. L. 

 Schmitt; 1 female (60926). J. E. Mills; 1 ovigerous female (M.C.Z.). 



Florida Keys; May, 1913; J. B. Henderson; 1 female, with left 

 orbit and maxilliped malformed (46064). 



BAHAMAS.— Spanish Wells; July 13, 1893; Biological Expedition, 

 State University of Iowa; 1 male; returned to sender. 



CUBA. — 1914; Henderson and Bartsch, Tomas Barrera Expedi- 

 tion: Ensenada de Cajon off San Antonio; station 11; May 22; 1 

 young male (48536); caught by copper sulphating on reef. On reef 

 flat between Cayo Hutia and Little Cayo, NE. of Light; 1 male 

 (48517). 



ST. THOMAS, VIRGIN ISLANDS.— Specimens in Copenhagen 



Museum. 



Genus LEPTODIUS A. Milne Edwards 



Leptodius A. Milne Edwards, Ann. Sci. Nat., ser. 4, vol. 20, 1863, p. 284; type, 

 L.exaratus (Milne Edwards) = C/iiorodfws exaratus Milne Edwards, 1834. 



Carapace broad, suboval, moderately convex anteriorly, flat in 

 posterior half ; regions generally well delimited and fairly well lobulated 

 in anterior tw^o-thirds, but not posteriorly. Antero-lateral borders 

 arched, usually cut into four strong teeth; postero-lateral borders as 

 long as chord of antero-lateral, moderately convergent, not concave. 

 Fronto-orbital distance about half or more that half of extreme width 

 of carapace. Front not produced, about a fourth the greatest width 

 of carapace; notched in middle line, separated from supra-orbital 

 margin by a notch or groove. Orbits suboval, margin with two suture 

 lines above and one just below outer angle; usually a prominent tooth 

 at inner angle of lower edge of orbit. Eyes on short thick stalks. 

 Basal antennal article short, meeting front at inner angle; flagellum 

 lodged in orbital hiatus. Anterior edge of merus of external maxil- 

 lipeds nearly transverse, with commonly a small tooth near antero- 

 internal angle. Chelipeds unequal in both sexes. Legs thick, upper 

 edges often sharp. Abdomen of male with third to fifth segements 

 fused. 



East and west coasts of America; Europe; eastern Atlantic; Indo- 

 Pacific region. 



KEY TO THE AMERICAN SPECIES OF THE GENUS LEPTODIUS 



A'. Antero-lateral margins dentate. 



B'. Palms of chelipeds without strong longitudinal ridges outside. 

 C Only five lateral teeth including orbital angle. 



D'. Last (or most posterior) of antero-lateral teeth directed obliquely 

 forward. 

 E'. Granulation of carapace and chelipeds inconspicuous. 

 Lateral teeth of carapace rather broad and flat. 



