102 
Psyche 
[June 
several veinlets in Pilar , etc., is not true ; even in the type 
of prestoni there are seven subcostal veinlets. Nallachius 
is undoubtedly a valid genus, however. It differs from 
Pilar and the other Old World genera by the triangular 
fore wings of the male, the long antennal pectinations of 
the male, the smaller number of cross-veins in the fore 
wings, the reduced hind wings of both sexes, the sexual 
dimorphism of the wings, and especially the male genital 
armature. It is impossible to give a more precise generic 
diagnosis at this time because of the few species known in 
the genus. In addition to prestoni the genus includes 
americanus McL., pulchellus Banks, bruchi Navas, loxanus 
Figure 1. Nallachius prestoni (McL.). Drawing of fore wing of the 
type ( £ ) in the British Museum (made by D. E. Kimmins). Lettering 
(original) : Rs, radial sector; MA, anterior media; MP, posterior media; 
CuA, anterior cubitus. 
Navas, and reductus, n. sp., described below; and of these 
only americanus and pulchellus are known (in the litera- 
ture) by both sexes. Furthermore, in the course of mak- 
ing this study, I have noted that the fore wings of ameri- 
canus (and presumably also of loxanus ) differ from those 
of the other species mentioned by having the posterior 
branch of MP anastomosed with CuA for a short interval. 
This is a very striking and unusual characteristic to find 
in the Neuroptera, and may turn out to be of generic 
significance, when the venation of loxanus is known for 
certain. 
The male genital structures show only slight differences 
in the several known species of the genus. In all proba- 
bility they will not be as useful in specific taxonomy as 
venational details. 
