218 BILLETIX: MUSEUM OF COMPARATIVE ZOOLOGY. 



Pars cephalica rather broader and less convex along anterior margini 

 than in related species. 



Clypeus slanting. 



Eyes large; five sixths their diameter apart, a little less than three 

 times their diameter (25 : 9) from lower edge of clypeus. Eye-tubercle 

 rather low but distinct, (Plate 10, fig. 7). 



Sternum longer than wide in ratio 25:19; narrowing from middle 

 caudad with the caudal end obtusely rounded, (Plate 10, fig. 6). 



Labium subcordate; distally acute; basal notches short, relatively 

 deep; a little longer than wide, the ratio being about 17:16, (Plate 10, 

 fig. 8). 



Coxae I and IV longer than others, subequal or I but slightly longer 

 than IV. Trochanter IV longest, I next. 



Claws of anterior legs with five long, stout teeth. An unpaired 

 claw is present on anterior legs, this being rather long, parallel with 

 paired claws, smooth. Membranous laminae below claws as in other 

 species, (Plate 11, fig. 3). Membranous appendage at base of ante- 

 rior tarsi and the membranous keel beneath anterior metatarsi as in 

 other species of the genus. All tarsi distinctly clavate excepting the 

 fourth which is but slightly so and more slender. The division of 

 tarsus most complete in fourth legs in which the parts are flexible at 

 joint. Hairs of tarsus all simple, none clubbed as c. g., in coccineus, 

 {Cf. Plate 11, fig. 2). 



Inferior piece of lorum of pedicel as usual. 



Inferior and median spinnerets in a recurved trans^*erse row as in 

 the other species. The superior spinnerets shorter than in most 

 species, not so much exceeding those of the lower row. 



Female. Length 6.7 mm. 



Locality. — Ollantaytambo, 9,000 feet, July. (Type, M. C. Z. 168, 

 one female). 



This form differs from all other species of the genus, according to 

 the published accounts, in having a large median claw on the anterior 

 tarsi in addition to the paired membranous laminae. Simon, in dis- 

 cussing the Caponidae, says in regard to the inferior claw in this 



