42 
Psyche 
[March 
of a transverse ring with three straps radiating from it and a trans- 
verse strap basal to it. Ovipositor valvulae (fig. 5.) with first valvula 
slender; second valvula broad basally, terminating in a long, slender 
process; third valvula a broad flap bearing many setae. Paraproct 
(fig- 3 -) with field of trichobothria in its antero-dorsal angle. Poste- 
rior margin of paraproct markedly protruding; ventral and posterior 
margins bearing many setae. 
Variation: aside from variations noted in the descriptions and 
measurements (table I), four male paratypes have wing and body 
markings somewhat paler than the holotype male, but this may be 
due to tenerality. IO/D ratios for three male paratypes are 0.69, 
0.70, and 0.70; PO ratios for these are 0.88, 0.85, and 0.9 1 ; numbers 
of ctenidia on posterior basal tarsal segment are 16, 19, and 18. 
Nymph: one nymph taken with adults of P. nebulosus is with 
little doubt this species. The association is made on the basis of 
similarity in size, color, (except the distal two-thirds of the abdomen 
is dark brown in the nymph), and general body shape, also on the 
structure of the lacinia and tarsal claws. The lacinia is broad apically 
with several indistinct denticles on the outer cusp. The tarsal claw 
bears a preapical tooth and a pulvillus of medium width bent at 
a decided angle near its base, as in the adult (fig. 7.). 
Type locality: Philippine Islands: Mindanao, east slope of Mt. 
McKinley, Davao Province, August and September, 1946, in mossy 
forest, elevation 6400 feet, H. Hoogstraal collector; holotype 3 , 
allotype $ , 4 $ paratypes and one nymph, all in collection of Chicago 
Natural History Museum. 
Discussion : Psilopsocus is apparently very close to the Myopsocidae. 
The following points of similarity were noted: 
1. Tarsal structure 
a. Number of segments same. 
b. Distribution of ctenidia same. 
c. Both with preapical tooth on tarsal claw. 
d. Pulvillus in both of medium width with a decided bend 
near its point of attachment. 
2. Lacinial structure. The lacinial tip of Lichenomima sparsa has 
a broad lateral cusp bearing 13 stubby denticles, and a short median 
cusp, hence it shows marked similarity to the lacinial tip of Psilopsocus. 
3. Male genitalia. 
a. Hypandrial margin. The rounded hypandrial margin of 
Psilopsocus is similar to that of several species of Rhaptoneura , 
Phlotodes, and Lichenomima. 
