1947] 
Dilaridce 
101 
between the members of the tribes Dilarini and Nallachiini. 
The former are relatively large, with a wing expanse of 
20 mm. or more, whereas the Nallachiini have a wing 
expanse of less than 10 mm. Furthermore, the wings and 
antennae of the Dilarini show much less sexual dimor- 
phism than they do in the Nallachiini. But these are dif- 
ferences in degree and will undoubtedly break down as 
more species are known. I believe that a more satisfac- 
tory and distinctly phylogenetic division of the family 
might be attained on the structure of the male genital 
armature and of the media and cubitus of the wings, as in 
other families of the Neuroptera (Hemerobioidea and 
Raphidioidea ; see Carpenter, 1935, 1940). Some evidence 
for this has already been obtained and will be presented 
in a later paper on the Dilaridae. 
Genus Nallachius Navas 
Nallachius Navas, 1909, Mem. Real. Acad. Cienc. Art. 
Barcelona, 7(17) : 665; Navas, 1914, Gen. Insectorum, 
156: 11. 
Male: antennae with long pectinations (usually 9-12). 
Fore wing distinctly triangular, coastal space of moder- 
ate width, traversed by numerous branched or unbranched 
veinlets; subcostal space narrow, with from 2-7 short 
veinlets ; Rs usually with 4-5 main branches ; MA always 
anastomosed proximally with Rs. Hind wing about two- 
thirds as long as the fore wing; Rs usually with one main 
branch less than in the fore wing. Genital armature 
consisting of a transverse proximal plate, two pairs of 
slender processes extending posteriorly from the plate, 
and a median aedeagus. 
Female: antennae filiform, as in other female Dilarids. 
Fore wing : more slender than that of the male, but with 
essentially the same venation. Hind wing: about two- 
thirds the length of the fore wing. Venation as in the 
male. 
Genotype : Filar prestoni McLachlan. 
Navas’ diagnosis of this genus is not entirely satisfac- 
tory. His statement that the subcostal space of the fore 
wings contains almost no veinlets, in contrast to the 
