. Bulletin - United States National Museum. Science. THE SPIDER CKABS OF AMERICA 289 Description.—Differs from N. lamellatus in having the large, pos- terior, dorsal area of the carapace but feebly defined by a low, blunt ridge; the spines are similarly placed. The pro togas trie tubercles are low. Rostrum bifurcate for more than half its length, varying from three-fourths in the holotype of carihhaeus to three-fifths in the paratype; horns variably divergent, slightly so in the figured specimen (pi. 237), more so (about 40°) in the smaller male from Sabanilla, 45° in Miers's type. Tooth on su
. Bulletin - United States National Museum. Science. THE SPIDER CKABS OF AMERICA 289 Description.—Differs from N. lamellatus in having the large, pos- terior, dorsal area of the carapace but feebly defined by a low, blunt ridge; the spines are similarly placed. The pro togas trie tubercles are low. Rostrum bifurcate for more than half its length, varying from three-fourths in the holotype of carihhaeus to three-fifths in the paratype; horns variably divergent, slightly so in the figured specimen (pi. 237), more so (about 40°) in the smaller male from Sabanilla, 45° in Miers's type. Tooth on supraocular eave insig- nificant, more so in large specimens than in Miers's type as figui'ed. Ba>al antennal article narrower than in lamellatus, bearing on its outer margin a tooth which is less prominent with age; tooth at antero-external angle less advanced than that at antero-internal angle. A tubercle instead of a compressed lobe behind outer margin of basal article and in transverse line with antennal glands. Antero- internal notch of merus of maxilliped well made, subrectangular. Chelipeds of well-developed male not quite so long as next leg, palm gradu- ally widened distally; fingers about one-tliird as long as palm, gaping in proximal half, a tooth on, the dactylus in the gape. Sixth segment of ab- domen of male with arcuate lateral margins. Measurements.—Male (16315), holotype of car- ihhaeus, length of carapace on median line to tip of posterior spine 16, length of carapace to tip of horn , width of carapace mm. Range.—Colombia to Bahia, Brazil. To a fig. 96.—notolopas. BRA depth of 20 fathoms. siuensis, male (iwis). ,, . , . -, MAXILUPED, X Material examined.— Sabanilla, Colombia; 1884; Albatross; 2 males, holotype and para- type of Hyastenus carihhaeus (16315). State of Parah3^ba, Brazil; Mus. Paulista (H. von Ihering); 1 male, No. 936 (returned to sender). Genus NIBILIA A. Milne Edwards Nibilia A. Milne Edwards, Crust. Reg. Mex., 1878,
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