THE BRACHYURA AND MACRURA OF PORTO RICO. 
57 
Key to the Porto Rican species of the genus Batraehonotus. 
A. Regions surmounted by a spine .frayosus 
A'. Regions not surmoun ted by a spine . bmsilieiisis 
Batraehonotus frag'osus Stimpson. 
Batrackonotvs frayosus Stimpson, Bull. Mus. Comp. Zool., n, 122, 1871. 
Male: Carapace coarsely t.uberculate, especially on protuberant portions. Cardiac, gastric, and 
branchial regions each surmounted by a stout spine. First segment of abdomen with a spine. Two 
large tubercles on intestinal region just above posterior margin, and many tubercles on the margin 
of the branchial region; also a short spine on subhepatic, and on pterygostomian region. Rostrum 
formed of two rounded lobes separated by a shallow notch; its margin and the supraorbital margin 
denticulate. Abdomen and sternum granulate, except, for a transverse smooth area between bases 
of chelipeds. 
Chelipeds a little longer than carapace, spinulous; ischium with a distal spine; man us slightly 
compressed; fingers nearly as long as the palm, gaping for nearly their whole length, a large tooth in 
middle of p>ollex. 
Females smaller, narrower behind and wider in front than males, tuberculation of carapace 
more uniform, cardiac area devoid of a spine, intestinal region without large tubercles. First ambulatory 
leg very little longer than the second, about 1.5 times length of the carapace. Abdomen tuberculate 
or granulate. 
Dimensions of male: Length, 7.8 mm.; width, 7 mm. 
Off Cape Hatteras to Florida Straits and Gulf of Mexico in a depth of 94 to 30 fathoms. Off St. 
Thomas, 20 to 23 fathoms, station 6079; off Vieques, 14 to 10 fathoms, stations 6085, 6091, 6092; off 
Culebra, 14| to 15 fathoms, stations 6086 and 6093; oft' Humacao, 91 fathoms, station 6098. 
Batraehonotus brasiliensis Rathbun. 
BdtrachnnntKs bmsiUen.su Ratlibun, Proc. U. S. Nat. Mus., xvn, 54, 4894. 
Male: Carapace tuberculate or coarsely granulate on the protuberant portions, smooth between; 
devoid of spines; two larger tubercles just above the posterior margin and near the median line; also 
one on the subhepatic and on the pterygostomian region. Otherwise as in P. frayosus. 
The female differs from male, as in the species B. frayosus , in being relatively wider across hepatic 
regions; the two large tubercles near posterior margin are wanting. 
Dimensions of male: Length, 4.5 mm. ; width, 4 mm. Female with eggs: Length, 7 nun.; width, 
6 mm. 
Off Rio de Janeiro, dredged (type locality) ; San .Tuan Harbor, Porto Rico, 41 to 51- fathoms, station 
6054, 1 male. This is the 'only specimen known except, the type. 
Genus EUPROGNATHA Stimpson. 
Eujtra, gncitha Stimpson, Bull. Mus. Comp. Zool., II, 4 22, 4874. 
Carapace pyriform. Rostrum short, with two small teeth or horns. Interantennulary spine 
usually present, pointing forward and downward at a much lower level than rostrum. Basal antennal 
joint narrowly triangular, with an outer and an inner granulate or dentate crest; armed at anterior 
extremity with a slender spine reaching forward as far or nearly as far as do the rostral horns; movable 
part of an ten use exposed from its insertion. A spine or tubercle on orbital arch. Eye peduncle short, 
with a tubercle at the emargination of cornea. Postocular spine reaching beyond extremity of eye. 
Herns of external maxillipeds somewhat L-shaped, strongly produced beyond insertion of palpus in 
front and at postero-inner angle. Abdomen of male with last two segments coalesced. 
Chelipeds with palms dilated; fingers in the male slightly gaping. Ambulatory legs of first pair 
much the longest, the others decreasing regularly in length. Dactyli long and slender, more than half 
the length of propodal joints. These crabs are almost naked, the ambulatory legs with a few curled 
sehe above. 
