4 88 
Psyche 
[December 
fess that I am well aware that some uncertainties still exist in my 
treatment of this genus. However, I feel compelled to recognize a 
total of fifteen species from Panama, Costa Rica, Trinidad, W. I. 
and Curacao, Netherlands Antilles. Eleven of these species are re- 
garded as new. The list of species recognized in this paper may be 
given as follows: Oonops amacus sp. nov. ; Oonops anoxus sp. nov. ; 
Oonops donaldi Chickering; Oonops itascus sp. nov.; Oonops ornatus 
sp. nov.; Oonops pallidulus (Chickering) ; Oonops persitus sp. nov.; 
Oonops reticulatus Petrunkevitch ; Oonops satinus sp. nov.; Oonops 
sicorius sp. nov.; Oonops tectulus sp. nov.; Oonops tenebus sp. nov.; 
Oonops trapellus sp. nov.; Oonops vestus sp. nov.; Oonops zeteki 
Chickering. Several specimens have been left unplaced in any species 
because of their uncertain status. One species in the above list is 
from Curacao, Netherlands Antilles, six are from Trinidad, W. I. 
and the remaining eight are from Panama and Costa Rica. 
In addition to the general family characteristics, the features of 
the genus Oonops as observed in this study may be stated as follows: 
the size varies from about 1.2 mm to 2.26 mm with females usually 
somewhat larger than the corresponding males. The carapace is 
usually of moderate height with both height and general shape vary- 
ing somewhat among the species; a few species have the carapace 
considerably more highly raised. There are six eyes in two rows in 
a fairly compact group; the posterior row is usually quite definitely 
recurved and somewhat wider than the anterior row and usually 
occupies most of the width of the carapace at that level. There are 
only small differences in the size of the three pairs of eyes. The 
chelicerae probably bear minute teeth on each margin of the fang 
groove but these are often difficult to observe. The maxillae and 
lip are usually conservative and without special modifications but 
there are occasional exceptions to this rule. The legs are moderately 
long and slender and have spines at least on the third and fourth 
legs but the spination is quite variable among the recognized species 
and often difficult to determine. The sternum is convex, only a 
little longer than wide; usually without special modifications but 
occasionally shows weakly developed lobes and grooves. The legs 
are most commonly 4123 in order of length but there is some varia- 
tion in the order in certain species. The male palp usually has rather 
distinctive tarsal features but other segments are not highly modified. 
Abdomen: a dorsal scutum is absent; typically two obscure ventral 
scuta are discernible in the anterior third of the venter but in some 
species these are so indistinct that clear representation in drawings 
