1972] 
Chickering — Oonops 
109 
widest; nearly 0.4 mm tall; slightly arched along median region 
from just behind PME to beginning of steep posterior declivity 
nearly opposite third coxae; surface smooth with few dark hairs; 
with no median fovea or groove. Eyes: six as usual in the genus; 
viewed from above, posterior row recurved and only a little wider 
than anterior row; occupies nearly five-sixths of width of carapace 
at that level. Ratio of eyes ALE : PME : PLE = 10 : 8.5 : 9. 
ALE separated from one another by nearly three-fifths of their long 
axis; separated from PME by a little less than one-fifth of their 
long axis and contiguous to PLE at one point. PME contiguous to 
one another for a. quarter of their circumference and separated from 
PLE by nearly one-fourth of their long axis. Height of clypeus 
nearly equal to one-tenth of the long axis of ALE. With consid- 
erable black pigment surrounding eyes (Fig. 11). Chelicerae: well 
developed; basal segment about 0.35 mm long; parallel; vertical; 
with a long, slender fang seen in no other species during this study 
(Fig. 12) ; when at rest the two fangs are, apparently, crossed. 
Maxillae: slightly convergent; membranous distal ends slightly turned 
outward; about twice as long as lip. Lip: about as wide at base 
as long. Sternum: convex; nearly as wide as long; surface smooth; 
bluntly terminated between bases of fourth coxae which are sepa- 
rated by slightly more than their width. Legs: 4213 in order of 
length; only slight difference in lengths of first and second legs; 
these legs with only occasional spines; third and fourth legs with 
numerous spines, especially on the tibiae and metatarsi; palp with 
very slender spines on femur, patella and tibia. Palp: all segments 
except tarsus of moderate length and with no dilation; tarsus with 
dilated bulb and distinctive embolus and conductor (Figs. 13-14). 
Abdomen: ovoid; with no clearly recognizable ventral scuta in holo- 
type or paratypes; other features as usual in the genus. Color in 
alcohol: carapace light yellow; legs yellowish above, lighter below; 
sternum light yellowish; abdomen nearly white with a pair of small, 
irregular, subsurface, brownish dots just anterior to base of spin- 
nerets on the venter. Two paratypes have light greenish abdomens. 
Diagnosis. This species appears to be most closely related to 
O'onops castellus from St. Thomas, U. S. Virgin Islands, and Oonops 
validus Bryant from the Dominican Republic. 
Records. Four paratype males were collected at the El Yunque 
Biological Station with the holotype. Two males were taken from 
leaf litter among coffee trees in the vicinity of Mayaguez, on Jan- 
uary 21, 1964. The female is unknown. 
