1961 ] 
Mockford — Psilopsocus 
4 I 
the rest of the hypandrium and bearing a row of tiny cilia (fig. 2.). 
Phallic frame (fig. 2.) a simple ring, slightly oblong, rather uniform 
in width except somewhat thickened apically and for a short distance 
along each side. Within the frame are a pair of membranous lobes. 
Paraproct (fig. 8.) with the usual field of trichobothria extending 
obliquely downward from its antero-dorsal angle. Posterior margin 
of the paraproct extended as a lobe tipped with a pointed process. 
Color (in alcohol) : compound eyes black. General body color dull 
ivory marked with medium to pale brown. Labrum, antennae, ocellar 
interval, and terminal two segments of maxillary palpi medium brown. 
Clypeal striations, cloudy spots around compound eyes and antennal 
bases, and a band bordering epicranial suture pale brown. Thorax 
irregularly mottled with large pale brown areas including most of 
the pleura and large areas of the tergal lobes. Brown areas of meso- 
thoracic tergal lobes darkest at their borders, pale in their centers. 
Legs dull ivory except medium brown on each coxa, distal end of 
each femur, distal end of each tibia, and all of each tarsus. Forewing 
hyaline, marked with extensive pale brown cloudy bands and spots 
as in text figure i. Abdomen ringed with irregular pale brown cloudy 
bands. Terminal segments medium brown. 
Allotype ?. Measurements (see table I). 
Morphology: IO/D = 1.56, PO = 0.72. Tarsal ctenidia present 
only on posterior tarsi with a row of 18 on Ti and one each on T2 
and T3. Subgenital plate (fig. 1.) with basal pigmented area in 
the form of two widely diverging arms. Median process of subgenital 
plate broad basally, abruptly narrowing to a slender tongue about 
half-way toward its tip; the broad basal portion bearing two large 
setae and the slender apical portion bearing many setae of various 
sizes. Sclerites of the 9th abdominal sternite (fig. 4.) in the form 
Table I. Length (in mm.) of various characters of 
Psilopsocus nebulosus 
Character 
$ 
$ 
5 
$ 
$ 
Entire body 
2.87 
2.82 
2.61 
3.03 
3-67 
Forewing 
4.44 
4.40 
4.44 
4.59 
4.65 
Hind tibia 
1.39 
1.43 
1.43 
1.57 
1.43 
Hind tarsus, Ti* 
0.465 
0.440 
0.476 
0.476 
0.405 
Hind tarsus, T2 
O.071 
0.071 
0.059 
0.071 
0.059 
Hind tarsus, T3 
0.1 19 
0.1 19 
0.131 
0.131 
0.1 19 
First posterior tarsal segment. 
