104 bulletin: museum of comparative zoology. 



Opiinae. 



There is a single poorly preserved specimen, No. 2294 M. C. Z. 

 (No. 12,796, S. H. Scudder Coll.) which appears to belong to this 

 group, but I cannot be positive. The marginal cell is very long and 

 broad, reaching to the extreme tip of the wing, and the insect has the 

 habitus of a Cardiochiles. 



Braconinae. 



But one genus, Bracon in the widest sense, has been found fossil. 

 It is recorded from many localities, both in Amber and in rock forma- 

 tions. A list of these will be found in the catalogue accompanying the 

 present paper. From Florissant, I have three species, one of them 

 represented by a considerable number of specimens. 



Bracon Fabricius. 



Key to the Florissant species of Bracon. 



1. Wings hyaline 2. 



Wings infuscated, length about 4 mm., second cubital cell twice 

 as long as high at apex B. cockerelli, sp. now 



2. Length 8.5 mm., second cubital cell long, nearly twice as long as 



high at apex B. abstractns, sp. now 



Length 12 mm.; second cubital cell but little longer than high; 

 trapezoidal B. resurrectus, sp. now 



Bracon cockerelli, sp. now 



Female. Length 4 mm. Black or very dark, with the abdomen reddish, 

 sometimes with indistinct darker, transverse bands. Wings infuscated, brown. 

 Antennae black, 32-jointed, tapered beyond the middle to a slender tip; most 

 of the flagellar joints about quadrate, the basal three or four joints of the flagel- 

 lum from one-fourth to one-half longer than thick. Head and thorax shining, 

 highly polished, impunctate. Abdomen subglobose or ovate both in lateral 

 and dorsal view, about as long as the head and thorax together, acutely rounded 

 at the tip. Ovipositor exserted, as long as the thorax and abdomen together. 

 Legs moderately stout, yellowish or pale reddish brown, the tips of the tibiae 

 and the tarsi (posterior legs?) darker, piceous. Wings very strongly infus- 

 cated and violaceous in some specimens. Stigma rather large and broadly 



