THE CANCROID CRABS OF AMERICA 471 



EUCRATODES AGASSIZU A. Milne Edwards 



Plate 190 

 Eucratodes agassizii A. Milne Edwards, Crust. R^g. Mex., 1880, p. 347, pi. 61, 

 fig. 1-le (type-locality, 100 fathoms, west of Florida; type not located); 

 Bull. Mus. Comp. Zool., vol. 8, 1880, p. 14, (type-locality corrected to 100 

 fathoms at lat. 21° 14' N. [Yucatan Channel], collected by Stimpson). — 

 Rathbun, Bull. U. S. Fish Comm. for 1900, vol. 20, pt. 2 (1901), p. 35. 



Diagnosis. — Antero-lateral margins dentate. Front one-third as 

 wide as carapace. Basal antennal segment touching prolongation 

 of front. Dactyli of legs long and straight. 



Description. — Carapace thick, very convex in an antero-posterior 

 direction, slightly convex transversely; regions scarcely indicated 

 except for the H-shaped depression at middle of carapace; surface 

 smooth to naked eye, but under the lens it is punctate and obscurely 

 granulate, except along antero-lateral margin, where the granules are 

 plainly seen. Antero-lateral margin obscurely five-toothed, first or 

 orbital tooth small; second rounded and separated from the first by a 

 shallow sinus, as in species of Eurypano'peus; third larger, but little 

 prominent; fourth not so wide but most prominent; fifth small. Front 

 slightly bilobed, lobes separately convex; a short closed median fissure; 

 margin thin. Lower surface of carapace coarsely granulate. The 

 arm has a superior subterminal tooth, the wrist a blunt inner tooth. 

 Surface of chelipeds similar to that of carapace; lower surface of 

 palms coarsely granulate. Dactylus of larger hand with a large basal 

 tooth. The brown color of the fixed finger covers only its distal half. 

 The chela figured by Milne Edwards is the smaller of the two; the 

 larger is more swollen. Ambulatory legs pubescent, margins hairy. 



Color. — Pale yellow; fingers brown (A. MUne Edwards). 



Measurements. — Male (24318), length of carapace 6.2, width of 

 same 8.5, fronto-orbital width 5.5, width of front 2.8 mm. Young 

 male (24319), length of carapace 3.3, width of same 4.2 mm. 



Variations. — The type male is intermediate in size between the two 

 above measured ; it shows only three lateral teeth on the carapace, on 

 account of the suppression of the second and fifth teeth shown in the 

 largest specimen. The teeth of the young male (see above) are also 

 undeveloped. 



Range. — Porto Rico; Yucatan, Mexico. 



Material examined. — Porto Rico; 1899; Fish Hawk: Off Aguadilla; 

 Point de Borinquen lighthouse, NE. by N. % N,, 3% miles; 137 

 fathoms; S. M. Sh.; temperature 24° C; January 18; station 6055; 

 1 male (24318). Mayaguez Harbor; Point del Algarrobo, E., 4% miles; 

 161-172 fathoms; M. S.; temperature 23° C; January 20; station 

 6066; 1 young male (24319). 



