her ie PROCEEDINGS OF THE NATIONAL MUSEUM. 259 
the top of the granules. Along the outer margins of the gastric lobes, 
bunches of granules beset with coarse hairs form a broad line which is 
continued to the rostrum. MRostral teeth sharp, produced beyond the 
_ orbital angles. Prorbital angle obtuse, less produced than the post- 
orbital, which is subacute. 
Antero-lateral teeth usually five in number (in one specimen four), 
acute, separated to their bases, the first the largest, the others as a 
rule decreasing regularly in size to the posterior, the tips of the five 
teeth making a single curve. In the largest specimen, however, the 
third tooth on one side is much smaller than the fourth; the third tooth 
on the other side is broken, but, judging from the base, it was interme- 
- diate in size between the second and fourth. Anterior margins of teeth 
thickened. Antero-lateral margin marked by inconspicuous granules 
irregularly placed, giving the teeth the appearance of being themselves 
minutely dentate. 
Basal article of the antenna with a sharp longitudinal groove through 
the middle. Tooth at distal extremity slightly more produced than the 
superior inner angle of the orbit, and visible in a dorsal view. Second 
article broad, with the outer lobe directed forward, and slightly thick- 
ened on the outer and anterior margins. Third article as broad as long. 
Surface of the abdomen and the sternum minutely pubescent. ~ Ap- 
pendages of male abdomen diverging slightly at the distal ends, hooked 
at the tips. 
Chelipeds in both sexes, slender, longer than the ambulatory legs, 
covered with fine punctures, upper margin with thinly scattered hairs. 
Merus angled, a few small tubercles on the upper margin. Manus very 
slightly tapering toward the distal end. Fingers in the male gaping 
for the proximal third, with a tooth on the dactyl; in the female, evenly 
dentate and in contact for nearly their whole length, a slight gape at 
the proximalend. Ambulatory legs very hairy above, first pair reach- 
ing to about the middle of the manus. 
Length and width of large female, 17.5 millimeters; width of front, 
9.8 millimeters. Length and width of largest male, 14 millimeters; 
width of front, 8.5 millimeters. 
Ten specimens were collected at Key West, Fla., by Henry Hemp- 
hill, 1885 (15807), and one female at the same locality, by the U.S. 
Fish Commission in 1884 (16298). 
Subfamily MITHRACIN &. 
Mithrax (Nemausa) spinipes (Bell). 
Pisa spinipes Bell, Trans. Zoék Soc., London, 11, p. 50, pl. 1x, fig. 6, 1836. 
- Nemausa spinipes A. Milne Edwards, Miss. Sci. au Mexique, pt. 5, 1, p. 82, 1875. 
Miers, Jour. Linn. Soc., London, xtv, p. 666, 1879. 
Mithrax (Nemausa) spinipes Miers, Challenger Rept. Zobl., Xvit, p. 85, 1886. 
A single male from the Gulf of California, has been referred to this 
species. It is asmaller specimen than the one figured by Bell (loc. cit.) 
