536 S. A. Rohwer — Three New Fossil Insects. 



segment wanting. Color perhaps rufous, no black markings 

 evident in the specimen. Wings hyaline, the venation pale 

 brown. The following measurements are in micromil- 

 limeters : — 



Length of the stigma _ 850 



Length of the second tran. cubitus _ _ _ 476 



Breadth of the stigma. ___ 1*70 



Length of the third cubital cell on the radius. _ _ 1820 



Length of the second cubital cell on the radius 935 



Length of the first cubital cell on the radius 255 



Length of the second cubital cell on the cubitus..,. .. 1105 



Length of the first cubital cell on the cubitus 1530 



Distance the tran. median is beyond the basal 289 



The first recurrent nervure beyond first tran. cubitus 325 



Habitat : — Tertiary shales of Florissant, Colorado. One 

 specimen collected by Prof. T. D. A. Cockerell at Station 9 (a 

 hill facing north about three-fourths of a mile southwest of the 

 town). The type in the University of Colorado. Many thanks 

 are due to Prof. Cockerell for assistance in the study of this 

 interesting fossil. This species is very distinct from Pro- 

 philanthus destructus CklL, the only other fossil Philanthid 

 known from Florissant, being readily distinguished by its 

 smaller size and the radial cell reaching the costa. In the posi- 

 tion of the second recurrent nervure P. saxigenus departs from 

 all other species of the genus Philanthus known to me, but 

 this is a matter of small importance. The grooves of the 

 mesonotum are very similar to those of Aphilanthops fridigus 

 (Cress.), but it cannot be an Aphilanthops on account of the 

 shape of the radial cell. Philanthus pulcher D. T. (pul- 

 ohellus Cress.), which has been taken at Florissant, is much 

 like P. saxigenus, but it is smaller and the venation is differ- 

 ent. Philanthus sanborni Cress. (Mass.) is very similar in 

 general habitus to saxigenus, and the specimen before me has 

 the second recurrent nearer to the second transverse cubitus 

 than in any other species I have seen. The relative length of the 

 second and third cubital cells is not reliable, and I do not think 

 the genus Epiphilanthus is a valid one. It might be used as 

 a group ; if so P. saxigenus should be placed in the group so 

 formed. 



