SERPHOID AND CHALCIDOID PARASITES OF THE HESSIAN FLY 145 



REVIEW OF LITERATURE 



This species has not been mentioned in the literature since the 

 original description. It was described from specimens reared at Elk 

 Point, S.Dak.. by C. N. Ainslie from Mordellistena sp. 



HOSTS AND LIFE HISTORY 



Besides the original record from Mordellistena sp., there are 

 specimens in the collection reared from an unidentified coleopterous 

 larva at Renwick near Ithaca, N.Y.. by Emma Avins. in Ma}' 1922, 

 and two specimens said to have been reared from Phytophaga 

 destructor by C. N. Ainslie at Dickinson, N.Dak., under Webster no. 

 23393. 



Nothing is known regarding the life history of the species. 



DISTRIBUTION 



Three localities in which this species have been taken have been 

 already mentioned, viz Ithaca, N.Y., Elk Point, S.Dak., and Dickin- 

 son, N.Dak. The only other record is of four specimens taken by 

 A. F. Satterthwait at Hinsdale, 111., October 10, 1929, on Helianthus 

 tuberosus, and recorded under Webster Grove no. 293085. These 

 localities indicate that the species may be distributed over most of 

 the northern part of the United States. 



IMPORTANCE 



Since but two specimens have thus far been reared from the hessian 

 fly, the species is evidently of no importance in controlling that 

 insect. 



OTHER SPECIES RECORDED IN LITERATURE AS 

 PARASITIZING THE HESSIAN FLY 



Several records in the literature of species parasitizing the hessian 

 fly, or possibly parasitizing that host, are believed to be either incor- 

 rect or in need of confirmation. One of these records refers to- a 

 species of Pteromalidae, one to a species of Scelionidae, another to 

 a species which has been placed doubtfully in Calliceratidae, and still 

 another to a species of Alysiidae. 



COELOPISTHIA FORBESII (Dalla Torre) 



Pteromalus pallipes Forbes, 111. State Ent. Rpt. 14: 46, pi. 4, fig. 1, 1885 

 (name preoccupied by pallipes Spinola) : Osborn, U.S.Dept.Agr., Bur. Ent. Bui. 

 (n.s.) 16:28, 33. 1S98. 



Pteromalus forbesii Dalla Torre, Catalogus liymenopterorum .... v. 5, p. 125, 

 1898 (for pallipes Forbes, not pallipes Spinola). 



No description of this pteromalid is given here because it is 

 almost certainly not a parasite of Phytophaga destructor, although 

 so recorded by Forbes. 



Forbes' types have been seen by the writer, and they are appar- 

 ently congeneric with species at present placed in the genus Coelo- 

 pisthia. A series of specimens in the collection which seem to agree 

 in every way with Forbes' types is said to have been reared from 



6685°— 33 10 



