406 A. #. Verrill—The Bermuda Islands. 818 
Heteropsocus dispar Ver., sp. nov. Figures 192, 192a, 1920. 
This elegant little species was found in all stages of development 
and in large numbers in the black, dry, decayed contents of an old 
calabash fruit. The male has both pairs of wings longer than the 
body, well developed and subequal, but the female has the fore 
wings shorter than the abdomen and the under wings are lacking. — 
The dark brown markings on the fore wings are very conspicuous, 
in the female forming a leaf-like or fern-like pattern, the dark brown 
Figure 192.—Heteropsocus dispar V.; x20; a, adult male; 6, male nymph; ec, 
adult female; d, nymph of female; from drawings by A. H. V. 
color continuous centrally, but lobulated along each side, the lobes 
alternating with clear marginal areas; veins few, not reticulated ; 
veins and margins of the wings are fringed with rather long hairs; 
end of wings evenly rounded ; antennz dark, very long and slender, 
equal to or exceeding the body, with 22-24 joints, the two basal ones 
much thicker than the others; legs long, brown ; tarsi three-jointed, 
1926 194 
Figure 192b.—Heteropsocus dispar,x8; a, male; 6, b’, adult females; e, e’, 
nymphs. Phot. by A. H. V. Figure 194.—Book-louse, much enlarged ; 
after Comstock. 
the proximal joints long, the others short, subequal; claws two, very 
small. Head large, broad, rounded in front and wide posteriorly; 
eyes large and prominent, black; palpi clavate ; body thick, dark 
brown or blackish, the thorax paler ; abdomen often black. Length 
of largest females, about 1™™. 
The nymphs are similar, but the body is lighter brown; the head 
is rather narrower and the eyes less prominent. The male nymphs 
