Some Illinois Microgasters. 7 



emerged specimens of a new species of Apanteles, for which the 

 above name is proposed. When the cocoons were collected, the 

 Apanteles larvge had not yet changed to pupic. 



This seems to be a common parasite of the Ornix named, 

 as it was very abundant in the Normal nursery; and I have 

 found it almost everywhere in the State where its host has 

 been observed. 



Cocoon, — Length, 3 mm. Width, 1 ram. Oblong cy- 

 lindrical; smooth, white, with a darker appearing central band 

 about .5 mm. wide. The darker appearance of this band is 

 caused, not by any difference in the color of the silk, but because 

 the cocoon is there very much thinner than at the ends. To 

 each end is attached a cord of fine silken threads, which are 

 also fastened to the sides of the leaf-mine, thus suspending the 

 cocoon after the manner of a hammock. 



Imago. — Length 2 to 2.5 mm. 6, ?. Black; palpi white; 

 labrum and mandibles piceo-testaceous. Legs of female 

 light red except base of posterior coxae, apical half of posterior 

 tibia?, and posterior tarsi, which are dusky. First pair of legs 

 of male light red, except coxae and apical joint, which are black- 

 ish; second pair with more or less black on coxae, femora, and 

 tibiae; posterior pair fuscous, with proximal portions of femora 

 and tibiae lighter, and coxae black. Sides and ventral portions 

 of anterior segments of the abdomen with more or less testa- 

 ceous coloring, especially in the males. Wings hyaline; tegu- 

 lae piceous; veins testaceous; stigma darker. Antennas pice- 

 ous; slightly longer than the body. Scutum of mesothorax 

 with rather distant shallow punctures, shining; scutellura also 

 shining, with a few very shallow punctures, Scutellum of me- 

 tathorax large, quadrate, reticulated, without median carina. 

 Terga of first two abdominal segments and l)ase of tergum of 

 third segment finely reticulate; remainder smooth and shining. 

 Tergum of basal segment narrowing posteriorly, with mem- 

 branous testaceous borders. Ovipositor one third as long as 

 abdomen. Radial vein arising beyond the middle of the 

 stigma. 



Described from twelve specimens (8 5, 4 ?), bred from 

 Ornix geminatella, Pack. 



