THE SPIDER CRABS OF AMERICA 153 



Material examined. — Florida; exact locality not given; A. S. 

 Packard, collector; 1 male holotype (53068); presented by J. S. 

 Kingsley to the Boston Society of Natural History. 



*EPIALTUS DILATATUS A. Milne Edwards 



Plate 45, fig. 2 



Epialtus dilatatus A. Milne Edwards, Crust. R^g. Mex., 1878, p. 140, pi. 



27, figs. 4-46 (type-locality, St. Thomas; type in Paris Mus.). 

 Epialtus bituberculatus Rathbun, Bull. Lab Nat. Hist. State Univ. Iowa, 



vol. 4, 1898, p. 255. 



Diagnosis. — Rostrum slight 1}' bilobed. Hepatic lobe larger than 

 branchial. Preorbital tooth distinct (fig. 53, j). 



Description. — According to A. Milne Edwards, this species is 

 distinguished from E. hituherculatus by the carapace wider anteriorly, 

 the hepatic expansions being much more developed and limited 

 anteriorly by a sinuous border, the rostrum wider, shorter, and 

 slightly depressed on the median line above; this depression is con- 

 tinued below where it is limited by two crests which unite behind in an 

 acute angle. Length of female 10.5 mm., width 8 mm. (A. M. E.) 



A specimen in hand, also female (15204), resembles fig\ire 4 cited; 

 the anterior border of the hepatic expansion is transverse but its 

 antero-lateral corner is rounded, the rostrum is a little longer and 

 less triangular, the preorbital tooth is small but distinct. 



Five other smaller specimens which seem to belong here show the 

 anterior hepatic margin directed more or less backward; not onl}' is 

 this margin sinuous, but the margin of the lateral sinus may be also; 

 the rostrum varies from subtriangular, as figured by Edwards, to 

 suboblong; the amount of emargination is variable, but is always 

 insignificant. 



Chelipeds, so far as observed, moderate; merus not cristate; carpus 

 with four longitudinal crests; manus slightly enlarged distally, upper 

 margin blunt, defuied b}' a depression on either side; fingers short and 

 stout. A slight tuft of hair on the lower margin of the propodites 

 of the ambulatories is inconspicuous. Fourth and fifth abdominal 

 segments of male and fourth, fifth, and sixth segments of female 

 coalesced. 



Measurements. — Female (15204), total length of carapace 10.2, 

 hepatic width 8.4, branchial width 9 mm. 



Range. — West Florida; Yucatan; Bahamas; Porto Rico; St. 

 Thomas. 



Material examined. — 



North Key section, Florida; lat. 29° 05' 00" N.; long. 83° 22' 30" 

 W.; 5.5 fathoms; sdy. rky. Co.; temp. 15.5° C; November 27, 1901; 

 station 7177, Fish Hawk; 1 female (47085). 



