SEEPHOID AND CHALCIDOID PAKASITES OF THE HESSIAN FLY 121 



by Aldrich to refer to O. frit. Other published records from North 

 America, as already mentioned, comprise that by Ashmead from 

 Phloeosinus dentatus (Say), those by Crawford and Frost from 

 Agromyza angulata Loew, that by Luginbill and Urbahns from 

 Cerodonta dorsalis Loew, the one by Seamans from Cerodonta 

 femoralw Meigen, and the one by Gr is wold from Phytomyza 

 delphiniae Frost. Of these records, the one from Phloeosinus 

 dentatus, a scolytid, is perhaps open to some doubt. The others are 

 probably correct. 



In addition to these published records, material in the National 

 Museum collection shows the following rearing records: From 

 Agromyza citreifrons Malloch at Wooster, Ohio, by J. S. Houser, 

 July 25, 1916; from Agromyza pusilla Meigen by C. C. Wilson at 

 Sacramento, Calif., August 20, 1924; from Agromyza coquilletti 

 Malloch in wheat leaf at Elk Point, S.Dak., October 1913 ; and from 

 Phytophaga destructor (Say) at Clearwater, Kans., by E. G. Kelly, 

 May 1915, at Randolph, Iowa, by E. G. Kelly, date not indicated, 

 at Wellington, Kans., by E. G. Kelly, date not indicated, and at 

 Centralia, 111., by W. B. Cartwright, July 19, 1921. Several other 

 specimens in the collection are said to have been reared from wheat, 

 but without identification of the host. 



DISTRIBUTION 



So far as the records show, this species in Europe is present only 

 in the British Isles. That its distribution is actually confined to 

 this limited area, however, is very unlikely. Schander and Meyer 17 

 record Halticoptera suilius (Walker) as a parasite of Oscinella frit 

 in Germany and it is possible that this may be H. aeneus. Halti- 

 coptera petiolata Thomson is also mentioned as a parasite of 0. frit 

 in Russia by Meyer 18 and this too may prove to be H. aeneus. 



In North America specimens of H. aenea in the National Museum 

 collection show the following distribution: New York, Pennsyl- 

 vania, Maryland, District of Columbia, Virginia, South Carolina, 

 Florida, West Virginia, Ohio, Indiana, Illinois, Wisconsin, Iowa, 

 Missouri, Louisiana, Mississippi, Texas, Kansas, South Dakota, 

 North Dakota, Montana, Colorado, Arizona, and California. Thus 

 it will be seen that the species occurs from the Atlantic to the Pacific 

 and from Wisconsin and North Dakota to the Gulf of Mexico. No 

 doubt it will be found in many other States of the United States 

 and probably in Canada. 



IMPORTANCE 



This species is an important parasite of the frit fly, but it appar- 

 ently attacks the hessian fly only incidentally. The few records from 

 that host indicate that it is of very little importance in its control. 



Family APHELINIDAE 



TUMIDISCAPUS FLAVUS Girault 



(Fig. 27) 



Tumidiscapus flavus Girault, Jour. N.Y. Bat. Soc 19 : 182, 1911 ; Mercet, 

 Mus. Nac. Cien. Nat. [Spain] Trab. no. 10, p. Ill, 1912; Gahan, U.S.Natl. Mus. 

 Proc. 55 : 405, fig. 3, 1919. 



" Schander and Meyer, Arch. Naturgesch. (AM. A) 90 (12) : 48, 1924. 

 18 Meyer, Rpt. Appl. Ent. Leningrad 4 : 242, 1929. 



