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 fm-row of chelicera with three or four teeth of 

 which the one nearest the claw is double or bifid. 



Length of female 3.5 mm. 



Zoca/t^i/.— Urubamba, 9,500 feet, July. (Type, M. C. Z. 191; 

 para types 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 E. taibo, (Plate 17, fig. 4). 



Length of female 3.5-4 mm. 



Loca%.— Urubamba, 9,500 feet, July. (Type, M. C. Z. 193, 

 female; paratype, M. C. Z. 194, one female). 



1 Gosiute niwina; aD iDclian. 



