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 23.4, width of carapace 10.5 mm. 



Range. — Colombia to Bahia, Brazil. To a fig. 96.— notolopas 



BRA 



depth of 20 fathoms. siuensis, male (iwis). 



,, . , . -, MAXILUPED, X 10.66 



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, p. 132; type, N. erinacea 

 A. Milne F.dwa,vds = antilocapra (Stimpson). 



Carapace pyriform, much swollen, longer than wide. Rostrum 

 bifurcate, horns moderately divergent. Preorbital angle prolonged 

 in a spine. Orbit complete below; orbital border armed with a spine 

 or tooth between the supraocular eave and the postocular cup; a 

 closed fissure between the suborbital border and the basal segment 

 of the antenna. This segment is elongate and bears a strong spine 

 on its outer margin and at its anterior angle; the next article which 

 is cylindrical is inserted beside the rostrum. The merus of the 



