— hoe oa Soe = Sen SA DATs ) San eae ere 
‘ os 3 ea it "a . eee 2 = ae 
262 CRABS OF THE FAMILY PERICERIDA—RATHBUN. — 
treed 
RECORD OF SPECIMENS EXAMINED. 
Florida: 
G. Wurdemann (2095, 15816). Carystort Reef; Dr. FE. Palmer (9257). Harbor 
Key (Union College Coll.). Key West; D. 8. Jordan (5758); U. S. Fish Com- 
mission (7339); H. Hemphill (9258). Garden Key, Tortugas (15081). 
Off Havana, Cuba, lat. 23° 10/ 48’ N., long. 82° 19/15’ W., 121 fathoms, fine gray 
coral, station 2330, U. 8. Fish Commission, 1885 (9502). 
Havana, Cuba; D. 8. Jordan (7854). 
Guadaloupe; L. Guesde (4095). 
Mithrax pilosus, sp. nov. 
Plate XXXIx. 
Carapace ovate-orbicular; width, without spines, less than the length. 
Postero-lateral margin rather long for the genus. Entire upper surface 
of the crab except the fingers, the proximal half of the manus, and the 
horny tips of the dactyls of the ambulatory legs closely covered with 
velvety hairs, which are present also on all the spines. Carapace fur- 
nished with spinose tubercles as follows: Three, small, arranged longi- 
tudinally each side of the median line just behind the rostrum; four 
transversely on the gastric region in two distant pairs; one further 
back on the median line of the gastric; three forming a triangle on the 
cardiac; nine or ten scattered on each branchial region; four in an 
arcuate row above the posterior margin. 
Rostrum composed of two spines strongly incurved at the tips; inter- 
space U-shaped. Preocular spine distinct, upturned. ( | 
Lateral spines five, stout, triangular, tipshooked forward. The fifth 
of the series is on the postero-lateral margin. Farther back is avery | 
small spine. There is also a small spine between the first and second _ 
lateral and the second and third lateral. There are three small tuber- | 
cles on the posterior margin. | 
Basal antennal joint broad. Spine at the antero-external angle about 
as long as the rostrum, but not so much advanced, directed outward; __ 
tip turned inward. Farther back on the outer margin there is a sharp 
triangular tooth, and another at the insertion of the second joint. Fla- 
gellum rather long. There is a triangular tooth on the lower orbital — j 
border next the postocular tooth. Lower surface of the crab covered 
with a short pubescence. 
Chelipeds a little shorter than the next pair of legs, not enlarged. 
Merus and carpus spiny above, the merus widening at the proximal 
end, the spines forming a crest on the distal half. Hand compressed, 
tapering slightly towards the fingers, spinose on the upper surface near 
the base, a character present in both sexes. Fingers slightly gaping | 
at base. Ambulatory legs very stout. Meral and carpal joints with 
two rows of spines above; carpal joints with one or two additional —— 
spines. Propodal joints short, broadly cylindrical; those of the first 
three pairs of legs with one or more spinose tubercles. Dactyls broad — i 
at the articulation, tapering abruptly to the curved horny tip. 
