8 Illinois State Laboratory of Natural History. 



Apanteles ckambi, sp. n. 



On the 13th of Jane, 1886, 1 found in a breeding cage con- 

 taining larvae of the root web worm, Cramhus zeellus, Fernald, 

 collected in the vicinity of Champaign, a Crambus cocoon con- 

 taining a dead larva and several Microgaster cocoons. From 

 the latter there emerged between June 19 and 22 several speci- 

 mens of a well-marked species of Apanteles, for which the above 

 name is proposed. Specimens exactly similar were bred during 

 July from larvae of Crambus exsiccatus infesting lawns at 

 Champaign. Doubtless this insect will aid materially in check- 

 ing the ravages of these species of Crambus which are so dif- 

 ficult to subdue by artificial means. 



Cocoon. — Length, 3 mm. White, thin, loosely fastened 

 together within the cocoon of the host. 



Imago. — Length, 2 mm. $, ?. Black; palpi white; man- 

 dibles testaceous; ventrum of abdomen, together with the ter- 

 gum of the third abdominal segment testaceous, lighter anteri- 

 orly. Terga of segments posterior to third, piceo-testaceous. 

 Legs light red, except claws of front and middle pair, and tips 

 of femora, together with the tarsi of posterior pair, which are 

 piceo-testaceous, and posterior coxae, which are black, tipped 

 with red. Wings hyaline; tegulae and proximal portion 

 of costa testaceous; stigma and apical portion of costa 

 darker, nearly piceous; veins whitish. Antennae piceous; 

 those of female shorter than the body, of male slightly longer. 

 Mesothorax closely punctured, shining. Scutellum of meta- 

 tliorax reticulate. Terga of two first abdominal segments lon- 

 gitudinally rngulose, remainder smooth and sliiuing. Ovipositor 

 concealed. JIadius arises slightly beyond the middle of the 

 stigma. 



Described from many specimens, bred from larviv of Cram- 

 bus zeellus^ Fernald, and C. exsiccatus, Zeller. 



{Distributed Aur/ust 3, 1887.] 



