no. 2358. NEW SPECIES OF FOSSIL INSECTS— COCKERELL. 



31 



preserved, the head darkest; wings slightly dusky, not spotted, 

 venation apparently normal for the genus, anterior cross-vein not 

 far from base of discal cell; proboscis rigid, longer than depth of 

 head ; oral region showing many short dark bristles and one long one; 

 legs unusually stout, especially the hind femora and tibiae; hind legs 

 quite thickly beset with short hairs. 



Eocene. "Cathedral Bluffs south of Little Tommies Draw at point 

 where samples were taken" (Winchester 17-5; U. S. G. S.) Colorado. 

 The very small size and thick legs are 

 peculiar, but thelivingi?. compta Coquil- 

 lett is as small, and the legs in the dif- 

 ferent species of RJiamplwmyia (see, for 

 instance, those in Baltic amber) show 

 much diversity. It therefore seems best 

 not to propose a new generic name. 

 There is a rather strong resemblance to 

 to the fossil MicropTiorus defunctus Handlirsch, from British America 

 (Tulameen Kiver), but our insect is smaller, with the hind femora 

 very much more robust. 



A detached wing, a little over 3 mm. long, is from Koan Mountain, 

 Colorado (Scudder; U. S. G. S. 52). So far as can be seen, it agrees 

 with R. enena. It shows the well-developed anal lobe, broadly 

 rounded and not projecting backward. 



Hohtype.—C&t. No. 66921, U.S.N.M. 



<*=d 



Fig. l.— Rijamphomtia enena. A . tart of 



"WING. B. END OF ABDOMF.N. C. ANTENNA. 



Family ASILIDAE. 



ASILUS PALAEOLESTES, new species. 



Female. — Length, nearly 14 mm.; black, the wings hyaline, with 

 dark veins; abdomen robust; legs spinose as in living forms. Veins 



bounding end of second basal 

 cell and base of fourth posterior 

 forming a cross, as in Asilus 

 (Tolmerus) notatus Wiedemann; 

 discal cross-vein oblique, its 

 lower end 1,280 n beyond level 

 of base of fourth posterior cell, 

 480 fj. before basal corner of 

 third posterior, and 1,090 n be- 

 fore end of discal cell. 



Eocene; White River, Colorado. (U. S. G. S. 391.) So far as can 

 be seen, this insect is entirely of a modern type. 

 Hototype — Oat. No. 66922, U.S.N.M. 



Fig. 2.— Asilus talaeoi-estes. Details of wing. 



