CHAMBERLIN: THE ARACHNIDA. 235 
Anterior row of eyes slightly procurved; median eyes two thirds their 
diameter apart, one and two thirds or more their diameter from the 
laterals; median eyes nearly four times their diameter from lower 
margin of the clypeus. 
Carapace smooth; not marginally dentate. 
Lower margin of furrow of chelicera with three or four teeth of 
which the one nearest the claw is double or bifid. 
Length of female 3.5 mm. 
Locality— Urubamba, 9,500 feet, July. (Type, M. C. Z. 191; 
paratypes M. C. Z. 192, three females). 
ERIGONE NIWINA,! sp. nov. 
Plate 17, fig. 4. 
Carapace, sternum, and coxae of legs light red or dilute chestnut. 
Legs distad of coxae dusky brown or blackish. Entire abdomen 
grey-black. 
Carapace smooth. 
Posterior row of eyes straight; median eyes their diameter apart, 
a little farther from the laterals (cir. one and a fifth). Lateral eyes on 
each side subcontiguous, the anterior distinctly the larger. Area of 
median eyes wider behind than in front in the ratio 11:7; slightly 
longer than the greatest width (12:11). Anterior row of eyes slightly 
procurved; median eyes smaller than the laterals in about ratio 3:4, 
two thirds their diameter apart, one and two thirds their diameter 
from the laterals and four times their diameter from the lower margin 
of clypeus. 
Sternum of the usual general form; equal in length and breadth or 
slightly wider. 
Upper margin of furrow of chelicera typically with a triple or trifid 
tooth nearest claw and two isolated teeth; lower margin with five 
teeth. 
Epigynum of same general form as that of EF. taibo, (Plate 17, fig. 4). 
Length of female 3.5-4 mm. 
Locality.— Urubamba, 9,500 feet, July. (Type, M. C. Z. 193, 
female; paratype, M. C. Z. 194, one female). 
1 Gosiute niwina, an Indian. 
