THE CANCROID CRABS OF AMERICA 507 



anterior and antero-lateral margins. Frontal margin spinulose. 

 Margins of the orbits above and below armed with spiniform teeth. 

 Antero-lateral margin with three spiniform teeth besides the angle of 

 the orbit, which, like the next lateral tooth, is bifid. Subhepatic tooth 

 minute. Subhepatic and suborbital regions covered with sharp gran- 

 ules concealed beneath pubescence. Feet pilose and spinulose ; spinules 

 shorter than in P. xantusii. Greater cheliped naked and obsoletely 

 granulated on the larger part of its distal surface." (Stimpson.) 



Measurement. — Male type, length of carapace 8.9 mm. (0.35 inch), 

 width of same 11.9 mm. (0.47 inch). (Stimpson.) 



Range. — Cape St. Lucas, Lower California, Mexico. Known from 

 the original description only. 



PILUMNUS FLORIDANUS Stimpson 



Plate 205, Figures 3 and 4 



Pilumnus floridanus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 141 

 (type-locality, Tortugas; type in M. C. Z.). — Rathbun, Bull. U. S. Fish 

 Comm. for 1900, vol. 20, pt. 2 (1901), p. 40. — A. Milne Edwards and 

 BouviER, Mem. Mus. Comp. Zool., vol. 47, 1923, p. 322. 



Pilumnus lacteus A. Milne Edwards, Crust. R^g. Mex., 1880, p. 292, pi. 51, 

 fig. 5-56. Not P. lacteus Stimpson, 1871. 



Diagnosis. — A transverse row of long hairs across front. Front 

 bare, unarmed. Orbit entire above, spinulous below. Four lateral 

 spines. Chelipeds spinous. 



Description. — A small species: Carapace covered with a dense, 

 short pubescence, thinning behind, and a few longer clavate hairs, a 

 transverse series of which across the frontal region is a conspicuous 

 feature. Lobes of front almost bare, edge slightly oblique, entire, 

 median notch triangular, lateral notches rounded, outer teeth minute, 

 deflexed. Hepatic region finely roughened above but without spines. 

 Antero-lateral marginal spines four, slender, set in conical bases; 

 below the interval between the orbital and the next spine may be seen 

 a small subhepatic spine. Orbital margin unarmed above, having a 

 small V-shaped notch opposite the end of the gastro-hepatic furrow; 

 armed below with from eight to ten spinules, those on the inner half 

 a little larger. 



Chelipeds spinous above, two spines near distal end of merus, carpus 

 armed all over its exposed surface; on the manus the spines become 

 pointed tubercles on the outer surface; the major manus has a limited, 

 smooth bare space on its distal lower portion, sometimes amounting 

 to half its outer surface in the male, usually much more restricted 

 and often lacking in the female. Ambulatory legs spined above. 



Measurements. — Male (11306), length of carapace 6.5, width of 

 same 9.6, fronto-orbital width 6.9, width of front 3.4 mm. 



Range. — North Carolina and Gulf of Mexico to the Virgin Islands. 



Material examined. — See table, pages 508-509. 



