40 
Psyche 
[March 
bases of Radius and Media + Cubitus in the hindwing is not found 
in the species described below, although a fold in the wing membrane 
running from the Radius just above this junction, to the wing base 
produces the appearance of two closely parallel veins. 
In the species described below, the coxal organ is well developed, 
with both rasp and tympanum. The rasp is composed of tiny in- 
dentations with raised edges. 
Psilopsocus nebulosus, new species 
Plate 5 and Text Fig. i 
Diagnosis: differs from the generotype, P. nigricornis End., pos- 
sibly in number of teeth on lacinial tip (6 indicated for nigricornis , 
1 1 in nebulosus) , number of ctenidia on basal segment of hind tarsus 
(15 in nigricornis , 16 to 19 in nebulosus) , shape of the pterostigma 
(less deep in nebulosus ), and details of the forewing markings 
(text figure 1), colorless areas being more numerous in nebulosus , but 
there being no colorless areas bordering the wing apex in this species. 
Holotype $. Measurements (see table I.). 
Morphology: IO/D (distance between eyes divided by greatest 
dorsal diameter of eye, method of Badonnel) = 0.78, PO (lateral 
diameter of eye from above divided by greatest dorsal diameter of 
eye) = 0.94. Apex of lacinia (fig. 6.) broad, with a distinct lateral 
and median cusp, the lateral broadest and bearing 10 denticles. 
Coeloconic sensilla of first flagellar segment two in number, both 
situated at the extreme base of the segment (fig. 9.). Distinct tarsal 
ctenidia present only on posterior tarsi, with a row of 17 on Ti and 
one each on T2 and T3 (Ti = basal tarsal segment). Hypandrium 
weakly sclerotized, its margin rounded except slightly flattened at 
the apex; this flattened apex slightly more heavily sclerotized than 
Text figure 1. Psilopsocus nebulosus n. sp., $, photomicrograph of right 
forewing. 
