30 
BULLETIN OE THE UNITED STATES FISH COMMISSION. 
Genus EURYPANOPEUS A. Milne Edwards. 
Eurypanopeus A. Milne Edwards, Crust. Reg. Mex., 318, 1880. 
Carapace rather broad, length about two-thirds the width, oval, depressed or slightly convex, the 
regions usually crossed by fine transverse broken granulated lines, but on the whole the carapace is 
smoother than in Eupanopeus. Antero-lateral borders horizontal or slightly upturned, as long as or 
slightly shorter than postero-lateral, arcuate, cut into five (including orbital) shallow teeth or lobes 
usually projecting little if at all beyond the general line of carapace. Second tooth low and rounded 
and rather closely fused with orbital. Fronto-orbital border more than half, and front a third or a 
little less than a third the greatest width of carapace. Front less advanced than in Eupanopeus; 
otherwise front and orbits much as in that genus. Orbital hiatus and basal joint of antenna narrower 
than in Eupanopeus. Chelipeds unequal in both sexes; the fingers may be acute or spoon-shaped or 
different on the two chelipeds of same species. Abdomen of male has usually the third, fourth, and 
fifth segments fused (only the fourth and fifth fused in E. dissimilis) . 
Eurypanopeus abbreviatus (Stimpson). 
Xantho parvulus Milne Edwards, Hist. Nat. Crust., i, 395, 1831 (not Cancer parvulus Fabricius, 1793). 
Panopeus abbreviatus Stimpson, Ann. Lyc. Nat. Hist. N. Y., vil, 211, 1800. 
Panopeus politics Smith, Trans. Conn. Acad. Sci., n, pp. 3 and 34, pi. i. f. 4, 1869. 
Panopeus parvulus Benedict & Rathbun, Proc. U. S. Nat. Mus., xrv, 369, pi. xxi, f. 1, pi. xxm, figs. 2 and 3, 1891. 
Eurypanopeus varvuius A. Milne Edwards, Crust. R6g. Mex., 322, pi. lix. f. 5, 1880. 
Eurypanopeus abbreviatus A. Milne Edwards, Crust. R<Jg. Mex., 320, pi. lix, f. 3, 1880. Rathbun, Ann. Inst. Jamaica, i, 19, 1897. 
Carapace granulate on anterior third and along antero-lateral margins; an oblique granulated 
ridge on hepatic region, another parallel to it on the branchial region opposite last lateral sinus; a few 
transverse lines on gastric region. First and second antero-lateral teeth separated by a very shallow 
sinus; other teeth separated by shallow notches, the third with almost straight outer margin, the 
fourth slightly arcuate, fifth small and blunt. Front less than a third the width of carapace, little 
advanced, a narrow open median notch, lobes sinuous, more produced toward middle. Chelipeds 
finely granulate and pitted; fingers pointed; those of large cheliped gaping, dactylus with a large basal 
tooth. Dark color of pollex running from between bases of fingers obliquely to lower margin of manus. 
Third segment of abdomen of male extends to coxae of last pair of legs. 
Length of male, 11.7 mm. ; width, 18.4 mm.; fronto-orbital width, 9.3 mm.; width of front, 
4.9 mm. 
Bahamas; Florida Keys to Brazil. Porto Rico: Ponce; Arroyo; Ensenada Honda, Culebra; 
Hucares. 
Genus HEXAPANOPEUS Rathbun. 
Hexapanopeus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, iv, 273, 1898. 
Carapace narrow (the length three-fourths or more of width), hexagonal, regions well delimited. 
Antero-lateral margin arcuate, about as long as postero-lateral, five-toothed, teeth prominent, orbital 
or first tooth partly fused with second, fourth tooth very prominent, fifth sometimes much smaller 
and almost postlateral in position. Postero-lateral margins strongly converging. Fronto-orbital 
border from half to three-fourths the greatest width of the carapace. Front from a fourth to about a 
third the greatest width of the carapace. Front advanced, with a median notch and oblique, sinuous 
or straight lobes, separated from inner orbital angle by a notch. Orbital margin with a well-marked 
lobe between sinuses above; otherwise the orbits are similar to those of Eupanopeus. Basal joint of 
antenna narrow, as in Eurypanopeus. 
The Porto Rican species are small. 
Distinguished from Eurypanopeus chiefly by the hexagonal, narrow carapace with produced 
front and very convergent postero-lateral margins. 
Key to the Porto Rican species of the genus Hexapanopeus. 
A. First and second antero-lateral teeth separated by a very shallow rounded sinus 
B. Fifth antero-lateral tooth almost obsolete 
B'. Fifth antero-lateral tooth well developed 
A'. First and second antero-lateral teeth separated by a deepish V-shaped sinus 
earibbxus 
hemphillii 
q uinquedentatus 
