158 
Psyche 
[June 
Several immature specimens of Oonops are in the collections but 
I have been unable to place them with any certainty. 
Genus Orchestina Simon, 1882 
Orchestina nadleri sp. nov. 
Figures 35-39 
Holotype. The male holotype is from Key West, Florida, Decem- 
ber 31, 1950 (A. M. Nadler). The species is named after the col- 
lector. 
Description. Total length about 1.0 mm (body bent and very 
fragile). Carapace 0.46 mm long; about 0.33 mm wide opposite 
interval between second and third coxae where it is widest; about 
O.24 mm tall opposite third coxae where it is tallest (Fig. 36) ; sur- 
face smooth with few hairs. Eyes: six as usual; with PME moved 
forward to make a row of four with ALE (Fig. 35) ; four posterior 
eyes in a strongly recurved row occupying about seven-ninths of width 
of carapace at that level. Ratio of eyes ALE : PME : PLE = about 
8.5 : 12 : 10 (long diameters always used for measurements). ALE 
separated from one another by slightly more than twice their diam- 
eter; well separated from PME and nearly contiguous to PLE. PME 
contiguous for nearly one-third of their circumference and separated 
from PLE by nearly their width. Clypeus somewhat porrect and 
with height a little more than width of PME. Chelicerae vertical 
and apparently without special modifications. Maxillae convergent; 
nearly meeting in front of lip which is somewhat diamond-shaped 
with posterior angle fitting into a median sternal groove not seen 
elsewhere. Sternum : scutiform ; somewhat convex ; without marginal 
lobes; bluntly terminated opposite bases of fourth coxae which are 
well separated. Legs: 41=23 in order of length; fourth coxae some- 
what enlarged ; fourth femora elongated and enlarged as usual in the 
genus; probably lacking true spines but with numerous hairs, bristles 
and trichobothria. Palp : parts so fragile that no attempt has been 
made to remove it for the usual more complete examination. Figure 
37 shows the essential features of the left palpal tibia and tarsus in 
retrolateral view. Abdomen : as usual in the genus. Color in alcohol : 
cephalothorax, legs and mouth parts light yellowish; abdomen almost 
white except for an area around the posterior end which appears light 
purplish gray. 
Female paratype. Total length about 1.43 mm. Carapace about 
O.55 mm long; about 0.44 mm wide; dorsal surface injured thus 
preventing determination of height. Eyes, mouth parts, sternum and 
legs all appear essentially as in male with minor variations. Ab- 
