Kill] Food Habits of American Gall Midges ."><> 



The subtribe trifili comprises the remainder of the genera 

 in the family. The genus Bremia Rond., representated by sev- 

 eral American species, is probably phytophagous. Aphidoletes 

 Kieff. contains several American species, a few of which at least 

 are known to prey upon Aphididae. It is possible that our 

 American species of Lobodiplosis Felt, Coquillettomyia Felt, 

 and Karschomyia Felt have habits similar to those of 

 the allied Mycodiplosis Rubs., the majority of the species of 

 which appear to subsist upon fungi, though one, M. acarivora 

 Felt preys upon Tetranychus. Youngomyia Felt displays a 

 preference for the buds of various plants. Species of Clino- 

 diplosis Kieff. have been reared from leaf galls on scrub oak, 

 .Spiraea, Carya, and from roots of Cattleya. It is probable that 

 the species occurring on hickory leaves is an inquiline. The 

 genus Caryomyia Felt comprises a number of homogeneous 

 forms producing a considerable variety of galls on hickory 

 leaves. We have yet to obtain undoubted evidence that mem- 

 bers of this genus live upon any other plant. Prodiplosis 

 floricola Felt has been reared from enlarged blossoms of spiraea 

 and clematis. Arthrocnodax Rubs, is represented by several 

 American forms, A. apifila Felt occurring in bee hives and prob- 

 ably subsisting upon organic debris, though subsequent inves- 

 tigations may show it to be predaceous. Hormomyia H. Lw. 

 comprises a number of large forms usually found in the vicinity 

 of swamps and presumably living mostly on sedges or allied vege- 

 tation. Four species, hardly typical of the genus, namely H. 

 crataegifolia Felt, H. canadensis Felt, H. clarkei Felt and H. ver- 

 ruca Walsh have been reared from leaf galls respectively, on 

 Crataegus, Amelanchier, Spiraea and Salix. The European 

 Monarthropalpus buxi Lab., producing an oval swelling upon the 

 leaves of Box has been recently detected in this country. Giar- 

 domyia menthae Felt was reared from a pustule-like gall in the 

 axil of the leaf of Mentha canadensis. Lestodiplosis Kieff. 

 is represented by a large series of mostly spotted- winged 

 midges which have been reared from a considerable variety of 

 plants. The larvae of some at least, are known to be zoopha- 

 gous and it is probable that most of the reared American forms 

 prey upon the larvae of gall-making midges. The genus 

 Itonida Meign,. better known as Cecidomyia Meign., comprises 

 a large number of forms inhabiting for the most part, flower, 

 bud and leaf galls on the higher flowering plants, though I. 



