CHAMBERLIN: THE ARACHNIDA. 209 
farther from the laterals than from each other. Area of median eyes 
distinctly narrower in front than behind. Lateral eyes close together, 
not more than their radius apart. 
Clypeus narrower than the anterior lateral eyes. 
Chelicera with lower margin short, but little oblique, armed with 
two (or three) small teeth; upper margin with three teeth of which 
the median one is largest. 
Labium longer than wide, narrowed distad, obtuse. 
Length of legs in order I-IV, II, III. Robust. Moderately spined. 
Metatarsi much longer than the tarsi. 
Cribellum bipartite. Calamistrum uniseriate. 
Genotype.— Aymarella munda, sp. nov. 
This genus would seem to be closely related to Calleva, a genus 
based by Simon upon an Argentine species; but it differs clearly in 
having the lateral eyes much closer together, in having the legs 
spined, and in having the metatarsi much longer than the tarsi. 
Callevopsis, a Chilean genus, differs, e. g., in having the eyes of the 
anterior row equidistant and the lower margin of the chelicera armed 
with four teeth. 
AYMARELLA MUNDA,' sp. nov. 
Plate 9, fig. 1-5. 
Carapace brown to fuscorufous with darker lines radiating from 
thoracic furrow. Sternum fuscous to nearly black; clothed with 
numerous black hairs. Legs testaceous, typically of rufous tinge 
distad on anterior pairs; femora darker, dusky to nearly black. 
Palpi fuscous. Chelicerae nearly black. Labium and endites very 
dark, pale across tips. Abdomen olive-grey; without distinct mark- 
ings but in some with a median hastate mark very vaguely outlined 
in dark and followed behind by several faint light colored chevron 
lines, the lines very thin, and also a small light dot each side of middle 
median mark. 
Posterior row of eyes decidedly longer than the anterior (3.4:2.9), 
a little recurved; median eyes smaller than laterals (7:9), 1.7 their 
diameter apart, a third farther from the laterals. Anterior row of 
eyes viewed from above with line of apices a little recurved; viewed 
from in front the line of centres is a little procurved; median eyes 
1 mundus, fine, neat. 
