146 
Psyche 
[Sept. 
one lot of which two pupae were associated. The pupae 
died before maturity, but possess the characters of the 
adult sufficiently well to permit identification. A cast 
larval skin of one is identical with larvae which he col- 
lected. This material of americanus was first correctly 
identified in 1945 by Henry K. Townes. More than 50 
years ago the late H. G. Hubbard collected a single nearly 
fully grown larva of Lomamyia which could not then be 
identified. A similar, though fully developed, larva 
taken in 1941 by R. J. Kowal likewise could not be named 
until the key to this identification puzzle was secured 
through study of first-stage larvae hatched by Mr. Barber 
in 1919 from eggs laid by a captive Lomamyia. 2 F. M. 
Carpenter of Harvard University made some most help- 
ful suggestions, when he learned of the study in progress, 
and I am also grateful for the photograph of Nallachius 
wings (fig. 1) which he kindly offered to make. Finally, 
I would express my appreciation to George E. Wallace 
of the Carnegie Museum for the loan of adult specimens 
of Nallachius americanus and the privilege of retaining 
two of them for the United States National Museum. 
In this paper I have included a few notes on the distri- 
bution and variation of Nallachius americanus, though 
my primary object is to compare the immature stages of 
Nallachius and Lomamyia morphologically and to discuss 
the relationship of the Dilaridse and Berothidas to other 
families in the light of present information. 
Hilarid^e 
The genus Nallachius Navas 
Nallachius Navas, 1909, Mem. Real Acad. Cienc. Artes 
Barcelona, vol 7, pp. 627, 666. Genotype : Pilar pres - 
toni McL., 1880, designated by Navas (1914). 
Carpenter’s revision (1940) and subsequent additions 
(1942, 1947) should be consulted for information on the 
taxonomy and distribution of the Nearctic Dilaridse and 
2 The specific identity of this female is uncertain. It was determined as 
L. flavicornis (Walk.) by A. N. Caudell in 1919, but determinations current 
at that time are rendered untrustworthy by the description of several species 
then unrecognized. The specimen was utilized for morphological study and 
is not now available. 
