46 Psyche [Sept. -Dec. 
structure of the genitalia are the points used to separate the 
adjacent subdivisions. 
The species evidently closely resembles Philonicus saxorum 
James, but the wing-veins are much darker, the second sub- 
marginal cell distally is less bell-shaped, the first posterior cell 
is less constricted at the middle, and the fourth posterior cell is 
not pedunculate at its base. I have compared the fossil with 
over fifty species of the Asilus complex before me, which are 
distributed among fourteen of its twenty subgenera. From some 
of the groups, e.g., Asilus s.str., Pampomerus , Tolmerus , etc., 
the fossil can be at once isolated because of the nature of its 
vestiture and its neuration. Of the species before me it com- 
pares most favorably with Iieligmoneura. The apparently red 
legs, the nature of their pubescence and bristles, and the hyaline 
wings are quite like the European H. flavipes Meigen. But the 
fossil shows a difference in having black bristles, longer front 
metatarsi and more arched second posterior cell. The Florissant 
specimen is probably a female for the bristles of the front fem- 
ora are stronger than in the male of Heligmoneura , and there is 
none of the shaggy hairs underneath the front femora. 
In size the fossil resembles our common Tolmerus notatus, 
but its bristles are much less evident and its legs are shorter. 
Although it does not belong to this division of Asilus it will be 
convenient to compare with notatus , inasmuch as Professors 
Cockerell and James have compared other fossil Asilidse with 
this wide-spread recent form. The tip of the marginal cell is as 
in notatus , and therefore blunter than in peritulus or amelan- 
chieris ; the second submarginal cell is considerably shorter than 
in either notatus or Cockerell’s species; the second posterior cell 
bulges as in peritulus ; the anterior crossvein is as in notatus , 
but slightly beyond middle of the discal cell; the fourth pos- 
terior cell is as in notatus and amelanchieris . 
The type bears the accession series number 38131, and is from 
the R. D. Lacoe collection of the National Museum. This beau- 
tiful fossil shows intermingled with the parts of the fly the 
remains of a beetle in part well preserved. From the robust 
body, strong clavate femora, broadened tarsi and the pitting 
and squamae of the legs and body it appears that the beetle is a 
weevil, similar to Phymatodes. It is not unlikely that the Asilus 
was overwhelmed just after securing the weevil as its prey. 
