chamberlin: the arachnida. 273 



Castaneira quechua, sp. nov. 

 Plate 22, fig. 1. 



Carapace, sternum, and chelicerae black; labium and endites also 

 nearly black excepting for pale tips. Coxae ventrally yellowish, the 

 femora black, the succeeding joints more or less dark testaceous, 

 except the tibia and metatarsus of fourth legs which are nearly black. 

 Abdomen black, a vague light line across middle above and laterally 

 but not crossing middle part of the venter. Carapace with numerous 

 white plumose hairs. Legs with similar hairs but also with numerous 

 black hairs intermixed. Abdomen with white plumose hairs and 

 many simple black hairs. 



Posterior row of eyes procurbed in such degree that a line tangent 

 to the anterior edges of the medians cuts the laterals near the begin- 

 ning of the caudal third ; medians nearly once and a third their diam- 

 eter apart, less than their diameter from the laterals which are of the 

 same size or nearly so. Area of median eyes equal in length and 

 breadth or very nearly so, scarcely narrower anteriorly than pos- 

 teriorly. Anterior row of eyes procurved; median eyee their radius 

 apart, half as far from the laterals; medians with diameter exceeding 

 that of laterals in ratio 9:7; the long diameter of the laterals exceeding 

 the lesser diameter nearly in ratio 7:5. Clypeus a little wider than the 

 diameter of a median eye (about as 11:9). 



Sternum three fourths as wid6 as long; borders depressed as usual; 

 anterior margin straight, sides converging to meet at an angle caudad 

 but the angle not acute. 



Labium and chelicerae typical. 



Tibia of leg I armed beneath with three pairs of spines, metatarsus 

 with two pairs. Tibia II with but two pairs of spines beneath, the 

 metatarsus also with two pairs. Tarsi and metatarsi I and II scopu- 

 late to base; metatarsi III and IV scopulate only distally. 



Female. Length, 8 mm. Length of cephalothorax, 3.25; width, 

 2 mm. 



