Vol. 64 
PSYCHE 
No. 2 
June, 1957 
TERTIARY FLIES FROM COLORADO 
AND THE BALTIC AMBER 1 
By Frank M. Hull 
University of Mississippi 
I wish to thank Dr. Frank M. Carpenter of Harvard 
University for the opportunity to study the following two 
species of most interesting fossil flies. The asilid from 
the Miocene shales of Colorado is particularly interesting 
because of the information that it alfords as to the narrow 
extent of change in Recent related flies. The syrphid in 
Baltic amber represents the third species belonging to its 
genus and is unusually well preserved. Both are from 
the collections of the Museum of Comparative Zoology. 
Senoprosopis romeri, new species 
Plate 2 
A slender asilid with elongate, attenuate abdomen, ex- 
tending considerably beyond the wing, and belonging to 
the subfamily Asilinae. All of the femora are moderately 
stout without being swollen. Bristles on the legs prominent, 
short and stout. Length 25 mm. 
Head: The head is well preserved, except for the 
antenna. Face quite short, more prominent below due to 
the recession of the eye. The whole face is very gently 
convex. Occiput prominent, no details of pile or bristles 
are present on the head. Thorax : The mesonotum is 
moderately high and arched, equally convex in front and 
behind. There are clear indications of scanty, scattered, 
moderately long, appressed, bristly setae which appear on 
the notopleuron area and with equally short elements on 
1 Published with the aid of a grant from the Museum of Comparative 
Zoology at Harvard College. 
37 
SMITHSONIAN 
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