290 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Labium a little longer than wide (17:16); notches one fourth the 
total length; sides convex, converging distad; distal margin widely 
weakly incurved. 
Scopulae of tarsi as usual, those of the anterior tarsi entire though 
not dense, those of the posterior pairs more sparse and divided by a 
wide setose band. Tibia I with the usual three pairs of ventral spines; 
tibia II with the usual distal pair of spines but with single median 
and basal spines toward caudal side, in place of the usual pairs. No 
median dorsal spine at base of posterior tibiae, this as usual represented 
merely by a long bristle in each case. Patellae not armed in median 
dorsal line. 
Female. Length,10mm. Length of cephalothorax, 4 mm.; width, 
3.1 mm. 
J fem. _ tib.+-pat. met. tar. total 
Leg I 3mm. 3.6mm. 2.1mm. 1.8mm. 10.5mm. 
Leg II 3 3.1 Zeal ea 9.9 
Leg II 2.7 Se 23 1S 9.8 
Leg IV 4 4.3 3 2eil 13.4 
Tibia I, 2 mm. 
Length of male, 8 mm.; length of cephalothorax, 3.8 mm., width, 
2.7 mm. 
Localities.— Cuzco, 11,500 feet, July. (Type, M. C. Z. 291, female; 
paratypes, M. C. Z. 292, numerous females). Arequipa, 7,600 feet, 
June 28. (M. C. Z. 323, one female). Urubamba, 9,500 feet, July. 
(M. C. Z. 293, on male, two females). 
Ortnocosa,! gen. nov. 
Cephalothorax much as in Lycosa, but with sides of head steeper. 
Anterior eyes small, the medians larger than the laterals to which 
they are closer than to each other; anterior row much shorter than 
the second, strongly procurved. Eyes of second row large, less than 
their diameter apart. Quadrangle of posterior eyes wider behind 
than in front (in type species the length of quadrangle is to length of 
cephalothorax as 1:3.6 or 3.7). 
Clypeus receding from median eyes; narrow, but equal in width 
to diameter of an anterior median eye. 
! Greek ’opervés, mountaineer, Lycosa. 
