THE CANCROID CRABS OF AMERICA 493 



PILUMNUS DASYPODUS Kingsley 



Plate 200, Figures 5 and 6 



Pilunmus dasypodus Kingsley, Proc. Boston Soc. Nat. Hist., vol. 20, 1879, p. 



155 (type-locality, Key West, Florida; type not located. — 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. 320. 

 Pilumn us vinaceus A. Milne Edwards, Crust. Reg. Mex., 18S0, p. 283, pi. 50 



figs. 2-26 (type-locality, Florida Reefs; type. Cat. No. 3049, M.C.Z.). 



Diagnosis. — Margins spinous. No superhepatic spines. Outer 

 surface of major palm of both sexes largely smooth and bare; spines 

 and tubercles of upper part not arranged in rows. 



Description. — Carapace thinly covered on its anterior two-thirds 

 with long fine hair and occasional stouter setae interspersed; upper 

 part of chelipeds and surface of legs similarly clothed. Under the 

 hair the carapace is roughened by granular hair sockets and on the 

 antero-lateral region by sharp granules. Frontal lobes with slightly 

 arched and oblique margins furnished with very short spines or sharp 

 granules and separated from each other by a median V notch and 

 from the small, inconspicuous, single-spined, outer tooth by a wider 

 U-shaped sinus. Orbital border strongly spined, about seven 

 spines below and three or four above with sharp granules toward 

 inner supraorbital tooth; the strongest spine is at the outer angle 

 where it forms the smallest of the four spines arming the antero- 

 lateral margin. They have conical bases and long, slender, incurved, 

 horny extremities. A short subhepatic spine. 



Chelipeds very unequal, spinous and granulate except lower-distal 

 two-thirds (about) of outer surface of major palm which is smooth 

 and naked in both sexes. The movable fingers have at base rows 

 of sharp granules and slender hairs. Fingers of minor chela grooved 

 on the outside, of major chela evenly rounded without grooves. 

 Legs spinous above. 



Color. — Body and claws brownish wine color, legs much lighter; 

 fingers and extremities of spines brown. (A. Milne Edwards.) 



Measurements. — Male (50535), entire length of carapace 10.7, 

 entire Nvidth 15, fronto-orbital width 10.4, width of front 4.4 mm. 



Affinity. — Small specimens of dasypodus are sometimes not easily 

 distinguished from sayi. P. dasypodus is less heavily clothed with 

 hair than sayi and less ragged looking. The front is more deflexed 

 and less advanced, therefore appears wider. The spines and tuber- 

 cles of the major palm in sayi are arranged more or less in rows and 

 these rows have a tendency to encroach on the lower distal half; in 

 dasypodus there are seldom any definite rows and the lower distal 

 two-thirds or one-half in both sexes is smooth and bare. The immov- 

 able finger of the major chela in dasypodus is a httle longer than in sayi. 



