116 THE SPRING GRAIX-APHI? OR " GREEX BUG." 



ducted about 200 experiments in order to gain some definite informa- 

 tion on this point. Their mode of procedure was to search out differ- 

 ent species of parasitized aphidids in the fields, rear the adult para- 

 sites, and breed them into Toxoptera graminum; then, if possible, 

 breeding them again into the original host. One attempt, rf unsuc- 

 cessful, was not considered sufficient, several trials being made. 

 While conducting these experiments, other species of parasites were 

 found that would breed into Toxoptera also. These will be dealt 

 with in their proper places. In all of these breedings, both parent 

 and offspring were kept separate and preserved for future study. 



It was found that Aphidius testaceipes would breed interchangeably 

 from Toxoptera into Aphis setaride, Aphis maidis, Aphis middletoni 

 Thos.. 1 Aphis gossupii. and a species of Chaitophorus. This is the same 

 as the list published by the senior author in the Annals of the Ento- 

 mological Society of America, 2 with the exception that Chaitophorus 

 is added and Aphis brassicse has been expunged from the list, as it 

 has been learned that the species of parasite that would interchange 

 with Toxoptera graminum and A. brass icx is another species of Aplii- 

 dius. 



Besides the above list of interchangeable breedings, Aphidius 

 testaceipes has been reared from Aphis Oenothera; at Salisbury, N". C, 

 by Mr. R. A. Vickery ; from A. medicaginis at "Wellington, Kans., by 

 Messrs. Kelly and Urbahns; from A. rumicis at Clemson, S. C, by 

 Mr. G. G. Ainslie; from Macrosipkum viticola at Wellington, Kans., 

 by Mr. Kelly; from M. granaria at Spartanburg, S. C, by Mr. 

 G. G. Ainslie; from Melanoxantherium sp. at Leavenworth, Kans., 

 by Mr. Kelly; from Macrosipkum sp. on black gum (Xyssa sylvatica) 

 at Salisbury, S. C. by Mr. Vickery: from Aphis accuse, at Salisbury, 

 X. C, by Mr. Vickery: at Leavenworth, Kans., by Mr. Kelly, and at 

 Washington, D. C. by Mr. C. X. Ainslie; and from Aphis medicaginis 

 by Mr. J. T. Monell, at St. Louis, Mo. Aphidius testaceipes has also 

 been reared from several unidentified species of aphidids, as follows: 

 From an aphidid on Ampehpsis sp. by Mr. C. X. Ainslie; from an 

 aphidid on CapseUa sp. at Wellington, Kans., by Mr. C. X. Ainslie : from 

 an aphidid on Koch ia scoparia at Rochester, Minn., by Mr. C. X. Ainslie ; 

 from an aphidid on locust at Wellington, Kans., by Mr. Kelly; from 

 an aphidid on plum at Salisbury. N. ft, by Mr. Vickery; from an 

 aphidid on pigweed {Chenopod ) hi Olmstead County, Minn., 



by Mr. C. X. Ainslie. 



Further addition to this fist of hosts may be made by citing the 

 hosts of some of the synonyms of Aphidius testaceipes. 3 We will deal 



i Aphis middletoni can not be satisfactorily separated from Aphis maidi-radicis and when found on any 

 other plant except Erigeron it has usually been identified as Aphis maidi-radicis. (See Bui. So, Bur. 

 Ent., U. S. Dept Agr., pp. 112-114. Contributions to a Knowledge of the Corn Root-Aphis, by R. A. 

 Vickery .) 



* Ann. Ent. Soc. Amer., vol. 2, No. 2, pp. 67-87, June, 1909. 



1 See Proc. U. S. Nat. Mus., vol. 11, pp. 665-669, 1888. 



