OF WASHINGTON, VOLUME XII, 11)10. 183 



Trioxys ovalis Provancher. 



Neuropenes ovalis Provancher, Add. Faun. Canad. Hym., 1886, 



p. 153. 



Ashraead has already indicated (Proc. U. S. Nat. Mus., 

 1901, p. 179) that Neuropenes Prov. is a synonym of Trioxys 

 Hal. A study of the types of Neuropenes ovalis upon which 

 Provancher founded the genus confirms Ashmead's statement. 

 The wing venation corresponds to Trioxys, and a female type 

 which is in poor condition has apparently the two horns on 

 the tip of the abdomen characteristic of Trioxys. 



Trioxys aceris Haliday. 



Trioxys aceris Haliday, Entom. Magaz., I, 1833, p. 490. 

 This species was described by Haliday from an aphis infest- 

 ing Acerpseudoplatanus. During the past spring the maples, 

 especially Acer platanoides, about College Park were over- 

 run with aphids which were authoritatively identified as 

 Chaitophorus aceris Linn., a species indigenous to Europe. 

 The aphids were remarkably free from parasites of any kind 

 and it was only after considerable search that a few trees were 

 found on the campus of the Maryland Agricultural College 

 which bore the swollen and shining bodies of aphids attached 

 to the leaves, marking them as the residing place of some 

 pupating aphidiine. Probably a hundred of these dead aphids 

 were collected, but for some unknown reason only one specimen 

 of the parasite was reared. This was a female unmistakably 

 belonging in the genus Trioxvs, and after comparing it with 

 Haliday 's original description as well as T. A. Marshall's 

 redescription of Trioxys aceris, I am convinced that it is of 

 that species. This rearing is chiefly interesting because it is 

 the first instance, to my knowledge, of the occurrence of the 

 species in America. 



Lysiphlebus testaceipes Cresson. 



Trioxys testaceipes Cresson, Kept. U. S. Dept. Agri., 1879, p. 208. 

 Aphidius citraphis Ashmead, Orange Insects, 1880, p. 71. 

 Aphidaria basilaris Provancher, Add. Faune Canad. Hymen., 



1888, p. 396. 

 Lysiphlebus piceiventris Ashmead, Proc. U. S. Nat. Mus., 1888, 



p. 604. 

 Lysiphlebus eragrostaphidis Ashmead, Proc. U. S. Nat. Mus., 



1888, p. 665. 

 Lysiphlebus coquilletii Ashmead, Proc. U. S. Nat. Mus., 1888, p. 



665. 

 Lysiphlebus abntilaphidis Ashmead, Proc. U. S. Nat. Mus., 



1888, p. 667. 

 Lysiphlebus baccarhaphidis Ashmead, Proc. U. S. Nat. Mus., 



1888, p. 668. 



