34 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Actaea setigera (Milne Edwards) . 
Xantlio setiger Milne Edwards, Hist.. Nat. Crust., I, 390, 1834. 
Actcea setiger Stimpson, Ann. Lyc. Nat. Hist. N. Y., vn, 51, 1859. 
Carapace wide, ovoid, covered with short, stiff yellow hair and with granules; strongly lobulated 
anteriorly. Antero-lateral border divided into four lobes, which do not project beyond the general 
outline of the carapace. Postero-lateral borders concave. Median notch of front large. Basal antennal 
joint short, not prolonged into orbit. Pterygostomian regions finely granulous. Chelipeds hairy and 
very granulous; fingers slightly deflexed, black, this color extending in full-grown males upon external 
and internal surfaces of palm almost to articulation with wrist; in females the fingers only are black. 
Fingers grooved, intervening ridges granulous on the proximal half; tips acute. Legs covered with 
hairs; meral joints of first three pairs smooth outside and granulous on margins; of last pair, granulous 
on outside also; two following joints granulous; dactyls long, granulous, and terminating in a sharp 
nail. Abdomen of the male long and narrow. 
Length of male, 16 mm.; width, 24.2 mm.; fronto-orbital width, 11.5 mm.; frontal width, 6 mm. 
Bahamas; Florida Keys; West Indies; Bermudas. Porto Rico: Playa de Ponce Reef; Caballo 
Blanco Reef, Vieques; Ensenada Honda, Culebra; San .Tuan (G. M. Gray). 
Actaea bifrons Rathbun. 
Actsea bifrons Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, iv, 262, pi. IV, figs. 3 and 4, 1898. 
Allied to A. setigera; carapace narrower and flatter; areolations similar, granulation finer, mar- 
ginal lobes more angular; hairs dark brown. Front with a double edge, the inferior slightly in advance 
of superior, but scarcely noticeable in a dorsal view; the two lobes of superior margin slightly arcuate, 
margin denticulate or granulate; lower margin viewed from in front sinuous; surface between the 
two margins concave. Epigastric region coarsely granulate. Eyes larger than in A. setigera; inferior 
orbital margin with a prominent tooth at inner angle. The chelipeds differ from those of A. setigera 
in having the fingers longer in proportion to the palm, more strongly bent downward, pollex wider at 
base than dactylus. Fingers horn color (the color extending one-third the length of palm in male) 
and almost smooth, being marked with lines of shallow pits; tips acute. 
Length of female, 5.3 mm.; width, 7.5 mm.; fronto-orbital width, 4.7 mm.; frontal width, 2.6mm. 
Off Aspinwall, 34 fathoms (type locality) ; off Vieques, 12 fathoms, station 6094; Ensenada Honda, 
Culebra. 
Actaea acantha (Milne Edwards). 
Cancer acanthus Milne Edwards, Hist. Nat. Crust., I, 379, 1834. 
Aetxa acantha A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat. Paris, I, 278, pi. xvn, f. 1, 1865. 
Aetxa spinifera Kingsley, Proc. Acad. Nat. Sci. Pliila., xxxi, 1879, 392, 1880. 
Carapace and feet covered with long hairs; lobules of anterior portion of carapace very prominent, 
covered with pointed tubercles or spinules, between which are deep smooth grooves. Frontal lobes 
rather well advanced, separated by a relatively broad median cut. Margin of front and orbits armed 
with spines. Antero-lateral margin cut into five lobes, each armed with three or four spines; outer 
orbital angle also spinulous. Postero-lateral borders concave. Posterior margin marked by rows of 
tubercles. Basal article of antenna spinulous. Merus of outer maxillipeds tuberculous, margins 
denticulate. Chelipeds subequal. Wrist and hand covered with spines; fingers short, spinulous, blunt, 
and somewhat hollowed out at tips; white at tips, remainder black, the black color extending in old 
males over nearly the whole hand. Ambulatory feet spinous. 
Length of female, 16 mm. ; width, 24.2 mm. ; fronto-orbital width, 12.5 mm. ; frontal width, 6.5 mm. 
Florida Keys: Jamaica; Guadeloupe; Fernando Noronha (Pocock). Off Gallardo Bank, Porto 
Rico, 10 fathoms, station 6076. 
Genus XANTHIAS Rathbun. 
Xanthodes Dana, Proc. Acad. Nat. Sci. Phila., vi, 75, 1852. (Name preoccupied.) 
Xanthias Rathbun, Proc. Biol. Soc. Washington, xi, 165, 1897. 
Carapace thick, but somewhat depressed, moderately broad, suboval, regions delimited and to a 
certain extent areolated in anterior two-thirds. Fronto-orbital border considerably more than half 
the greatest width of carapace in extent. Front broad, bilobed. Antero-lateral border cut into three 
