40 
Psyche 
[March 
Holotype: Museum of Comparative Zoology, No. 4921; 
collected by F. M. Carpenter and C. T. Parsons in the 
Evacuation Creek Formation, Green River Shales, about 
ten miles west of Evacuation Creek and the town of Wat- 
son, Utah. The fossil is very well preserved, showing 
antennae, legs, and all four wings ; one pair of wings 
(fore and hind) rest together along the abdomen, but 
the other two extend below the body and are separated. 
The bases of the wings are partially concealed by the body 
of the insect and the veins there are not clearly preserved. 
The absence of copuloli and paraprocts shows that the speci- 
men is a female. 
Figure 2. Photograph of Bittacus egestionis, n. sp., from the Eocene 
of Utah. Length of fore wing, 8 mm. 
Aside from generic differences this species differs from 
P. eocenicus by its more robust facies and smaller size. 
Its venation is typical of that of Bittacus, but the species 
is smaller than any other known in the family, so far as 
I am aware. In my account of the Baltic amber Mecoptera 3 , 
I pointed out that one of the amber species, Bittacus 
