August, '10] FELT: GALL MIDGES 347 



GALL MIDGES OF ASTER, CARYA, QUERCUS 

 AND SALIX 



By E. P. Felt, Albany, N. Y. 



The following tabulation of the species reared from the above 

 named plants will prove of service in identifying the midges occurring 

 thereupon. It is extremely interesting to compare the 18 species 

 occurring upon aster with the 35^ found living at the expense of 

 solidago. It is probable that these lists represent conditions with a 

 fair degree of accuracy, since the data in both instances has been 

 obtained verj^ largely by collections on asters and solidagos in the 

 vicinity of Albany, X. Y., and also at Magnolia, Mass. The tabulation 

 of hickory species shows that many of the midge galls occurring upon 

 this plant are produced by Caryomyia, a peculiar and extremely 

 interesting genus which appears to be restricted to this food plant. 

 The same is true in large measure of Quercus and Cincticornia, this 

 latter Cecidomyiid genus probably being confined to the oaks. 



The ^^illow, with its dominance in certain localities and numer- 

 ous species, is also extremely interesting, since it affords sustenance 

 to about 46 species of gall midges, some 5 living upon the leaves, 13 

 producing bud galls of various kinds, w^hieh. in turn, are inhabited 

 by 7 other species, mostly inquilines. There are. in addition, 21 

 species infesting the t\ngs, a number of these occurring in the slen- 

 der, very slightly enlarged twigs and hardly producing a gall. A 

 few excavate galleries in the wood, while the majority work in the 

 subcortical tissues. The willow is a marked favorite mth Rhabdo- 

 phaga, members of this genus producing conspicuous bud and twig 

 galls. Several species of Mayetiola are also found and in one in- 

 stance at least species belonging to two genera w^ere reared from the 

 same twig. 



Aster 



Flower or Bud Galls 



Aborted head on Aster patens. Adult, length 4 to 5 mm., dark brown, 

 easily recognized by the broadly, white-banded tarsi. 



AspJiondylia monacha 0. S. 



Dwarfed or stunted flower heads on Aster paniculata. Female, 

 length, 2.5 mm., reddish brown; 19 antennal segments, the fifth with 



•1909, Felt, E. P. Gall Midges of the Goldenrod, Ottawa Naturalist, 22: 

 245-49. 



