BULLETIN OF THE UNITED STATES FISH COMMISSION. 
70 
outward; outer spine small; a third spine or sharp tooth is placed at insertion of second joint. Orbital 
spines and teeth five, exclusive of antennal; preorbital acute, elevated, curved inward. Anterodateral 
margin with two prominent spines — one hepatic, the other at branchial angle; between them are two 
clusters of tubercles; in front of and behind branchial spine is a small spine or spinule. Inferior regions 
of carapace covered with tubercles, which become spinulous on subhepatic region. Arms of chelipeds 
with blunt spines above; hands unarmed. Ambulatory legs flattened above and hairy; meral and 
carpal joints armed with two rows of spines. 
Dimensions of female: Entire length of carapace, 21.5 mm.; entire width, 21.2 mm. 
Tortugas, 7 fathoms; St. Croix; St. John. Off Vieques, 21 fathoms, station 60S9, 1 young specimen. 
Mithrax cinetimanus (Stimpson). 
Mitliraculus cinetimanus Stimpson, Amer. Jonr. Sci., xxix, 132, 1S60; Ann. Lye. Nat. Hist. N. Y., vn, 1S6, 1860; A. Milne 
Edwards, Crust. Reg. Mex., 112, pi. xxm, f. 3, 1875. 
Mithrax cinetimanus Miers, Challenger Rept., Zool., xvn, 87, 1880. 
Carapace longer than broad and covered, especially on posterior two-thirds, with small, rounded 
lobules. Branchial regions obliquely sulcate. Rostral horns short, rather narrow, and widely sepa- 
rated. Inner angle of orbit prominent, acute. Antero-lateral margin with four small teeth, often 
tuberculiform. Basal joint of antenna very broad, with an antero-external spine, not exceeding upper 
preorbital tooth. Arm tuberculous, two spiniform teeth on inner margin; wrist smooth, two tubercles 
on inner margin; palm somewhat dilated; fingers gaping; a tooth on dactyl us near its base; sometimes 
a smaller one on pollex near spoon. Ambulatory legs a little rough, sparsely hairy, hairs fine and 
chiefly on last three joints. 
Color, yellowish, with a large brown spot covering a large part of the cardiac region. Claws and 
feet spotted with brown and white; often the dark shade forms a broad band on the hand, whence 
the specific name. 
Dimensions of male: Length, 18.2 mm.; width, 17.7 mm. 
Gulf of Mexico; Florida Reefs; West Indies; Curasao. Guanica Bay, Porto Rico, on coral reef. 
Mithrax forceps (A. Milne- Ed wards )d 
Mitliraculus forceps A. Milne Edwards, Crust. ROg. Mex., 109, pi. xxm, f. 1, 1875. 
Mitliraculus hirsutipes Kingsley, Proc. Boston Soc. Nat. Hist., xx, 147, 1879; Proe. Acad. Nat, Sci. Phila., xxxi, 389, pi. xiv, 
f. 1, 1879. 
Mithrax forceps Miers, Challenger Kept., Zool., xvn, pp. 87, 88, 1886. 
Carapace comparatively smooth, large specimens with scattered punctures, small ones deeply 
sculptured. Three grooves run diagonally backward from near first., second, and fourth sinuses of 
lateral margin; of the intervening ridges thus formed, the two anterior are not broken up into lobules, 
as in M. sculpt us. Six or seven depressed tubercles along margin and on posterior part of branchial 
region, two or three along outer margin of hepatic region, and two pairs on frontal region directly 
behind lobes of rostrum. Median notch of front broadly V-shaped. Antero-lateral teeth four, acute, 
slender, separated by broad rounded sinuses, the first the shortest and in large specimens subacute, 
the remainder sharp and directed forward, the second usually the longest and largest. Sometimes a 
small postero-lateral tooth. Arm with five sjaines or spiniform tubercles on upper margin, two on 
inner face just below margin; on the inner margin two prominent teeth. Carpus smooth, sometimes 
unarmed, often with a short spine or tubercle on inner margin anterior to inner angle, giving appear- 
ance of a double tooth. Fingers widely gaping in male; dactylus with a large tooth one-third distance 
from proximal end, or instead a few minute teeth; the pollex may have from one to three small teeth 
or tubercles in the middle. Ambulatory legs distinctly spiny and fine-hairy. 
Color, cinnamon or reddish-brown. 
Dimensions of male: Length to base of rostral lobes, 30.5 mm.; width, without spines, 35 mm. 
From North Carolina to the Abrolhos Islands, Brazil; Bermudas; in 1 to 17 fathoms. Porto Rico: 
Mayaguez Harbor; off Gallardo Bank, 10 fathoms, station 6076; off Vieques, 6 to 16 fathoms, stations 
6085, 6091, 6092, 6096; off Culebra, 15 to 151- fathoms, stations 6087, 6093; off Humagao, 9j to 121 fathoms, 
stations 6098, 6099. 
1 Mr. Rankin, in Ann. N. Y. Acad. Sci., xn, 532, 1900, uses the name M. hirsutipes Kingsley as having priority. The 
Crustacea of the Mission Scientifique, by A. Milne Edwards, appeared in sections from 1873 to 1880, as indicated on the, 
wrappers of the separate parts. According to the Bibliographie de la France for 1875, pp. 57 to 120 (including the descrip- 
tion of M. forceps) were issued December 4 of that year. 
