90 bulletin: museum of comparative zoology. 



large, broadly triangular, emitting the radius somewhat beyond the middle. 



Costal margin thickened at the insertion of the basal nervure ; first and second 



sections of the radius meeting at 

 an oblique angle; both straight, 

 the second three times the 

 length of the first. Areolet 

 rather small, oblique, in the 

 form of an elongate, inverted 

 trapezoid; median and subme- 

 dian cells of equal length. 



Fig. 72. — Demophorus antiquus, sp. nov. _ ,,_ „_-■»- ^, r-, 



Type. Type.— No.2287,M.C.Z. ; 



Florissant, Col. (No. 13,869, 

 S. H. Scudder Coll.). Also No. 2288, M. C. Z., Florissant Col. (No. 

 11,699, S. H. Scudder Coll.). 



This seems to belong to Thomson's genus Demophorus, known 

 hitherto by two recent species from Europe. The thickened hind 

 femora suggest a possible relationship with Pristomerus and its allies, 

 but I can detect no teeth on them, upon which character the recognition 

 of these genera principally depends. 



ALYSIIDAE. 



Up to the present time this family has not been recognized in the 

 fossil state, but the present collections contain two species which 

 undoubtedly belong here. 



Although easily distinguished by their peculiarly attached mandibles 

 from the Braconidae, particularly the subfamily Aphidiinae which they 

 resemble in venation, members of the family are not easily recog- 

 nizable in the fossil state. This is due to the fact that the form and 

 insertion of the mandibles are usually very difficult to make out unless 

 the preservation of the specimens is unusually good. Both of the new 

 species belong to the genus Alysia sensu lato. 



Alt si a Latreille. 



Key to the Florissant species of Alysia. 



1. First section of the radius less than one-half as long as the second; 



third section straight A. petrina, sp. nov. 



First section of the radius considerably more than one-half as 

 long as the second; third section distinctly arcuate. 



A. exigua, sp. nov. 



