158 C. B. HAHDENBEKG. 



Thi<: Imago. 



Only tlie male is winged. It is a dull grey motli, witli a 

 sprinkling of black liairs over the wings^ thicker at the basal 

 half, so that the outer part of the wings looks transparent. 

 The moth is small, expanding only some 20 mm., and is of 

 rather slow flight. We have seen it flying just at dusk, but 

 it is not attracted to the light (PI. XIII, fig. 7). 



The female is of the usual Psycliid type, wingless. As 

 the female appears to be unknown, a description of the only 

 specimen bred is given. 



Adult Female. — Female apterous, vermiform. Length 

 17 mm. ; width and depth 4h mm. at 6th abdominal segment, 

 tapering gradually from there cephalad, more abruptly 

 caudad. Body wall transparent, its colour maize yellow [TV). 

 The head is chitinous, as mIso the first thoracic segment on its 

 dorsal and lateral aspect; the following two thoracic segments 

 and the anterior half of the first abdominal segment are 

 chitinised on their dorsal aspect only. These chitinised parts 

 are Mars yellow (III) shading into amber brown (III). Head 

 small, conical, broadly rounded in front, directed ventro- 

 caudad, with small eye-spots and a median orifice. Pro- 

 thoracic spiracle large, prominent, those on the other 

 segments hardly distinguishable. 



Legs vestigial, represented by a thin, bifurcate, transverse 

 plats on each of the thoracic segments (text-fig. 7, a, b). The 

 legs show a considerable variation in the amount of their 

 development. While in some specimens they are represented 

 only by membranous appendages, in other cases they show 

 a fair amount of chitinisation ; the}^ are fused in the median 

 line to a much smaller extent, are no longer flat, show a 

 certain thickness, and the coxal parts can be distinguished 

 from a distal portion. In no instances, however, could the 

 presence of terminal claws be ascertained. 



Body wall transparent, so much so that the eggs contained 

 in the body are distinctly visible and the nerve ganglia can 

 be plainly seen on the ventral aspect. Abdominal segment 7 



