lyOg ENTOMOLOGICAL SOCIETY. 45 



inhabiting- herbaceous plants usually appearing in rather early spring, while 

 certain of the forms occurring in woody tissues do not emerge till June. 



Representatives of the genus Dasyneura exhibit a marked preference for 

 leaf folds, leaf buds or loose leaf bud galls. Dasyneura anemone, Felt, 

 occurs in a loose apical bud of Anemone canadensis, while D. clematidts. 

 Felt, inhabits an oval stem gall. The genus Rhabdophaga, as we understand 

 it, exhibits a marked partiality for the willow, breeding for the most part 

 in bud galls or woody tissues. Some eighteen species are known to inhabit 

 this plant. 



The Oligotrophiariae is best represented by the genus Rhopalomyia, 

 which latter displays a very marked preference for solidago, fifteen species 

 occurring on this plant and subsisting at the expense of the flowers, the 

 leaves, the stems, or even on portions of the underground root stocks. The 

 f?pecies are easily reared and, so far as we have been able to determine, each 

 is responsible for a peculiar type of gall. Six species of Ma.yetiola have been 

 reared from willow, M. u-alshii, Felt, producing an apical rosette gall, M. 

 rigidm, 0. S., forming a characteristic apical beak gall, while the other 

 species occur in woody tissues. 



The Asphondyliariae is a very well marked group exhibiting consider- 

 able similarity in habit. The typical genus Asphondylia may well be repre- 

 sented bv the common A. inonacha, 0. S., a STiecies which breeds in both 

 solidago and aster. It has been reared from apparently unaffected blossoms 

 of plants belonging to both genera. It occurs in small rosette galls on the 

 narrow-leaved solidago, Euthamia lanceolata, and has been reared from 

 ^hat we have designated as the adherent leaf gall on Solidago canadensis 

 and S. serotina. This latter gall is simply an oval cell formed by two leaves 

 adhering at the margin of the cavity. Most of the species of Asphondylia 

 occur in bud galls, and it is probable that some forms are injurious. The 

 allied Schizomyia likewise breeds in bud galls or may be responsible for 

 modifications of the same such as the hard, nut-like, polythalamous gall of 

 Schizomyia pomum, Walsh, much better known as Cecidomyia vitis-pomum, . 

 A large, oval or fusiform petiole or tendril gall \a made by S. petiohcola. 

 Felt. The genus Cincticornia is also included in this group and breeds, so 

 far as known, in leaf galls. Cincticornia carycc. Felt, was reared from a 

 conical leaf gall on hickory, while C piluloc, Walsh, better known under the 

 name of Cecidomyia, inhabits the common reddish, ovate hard leaf gall on 

 oak. 



The Diplosarise includes a large number of forms most easily recognized 

 by the two swellings on each antennal segment in the male. Practically 

 nothing is known concerning the life history of the larger, heavier forms of 

 Hormomyia, though some of the smaller, lighter forms have been reared, 

 such as H. caryrc, 0. S., and H. hoJotrichn, 0. S., both better known under 

 the name of Cecidomyia. H. craUvgi folia, Felt, has been reared from a cocks- 

 comb gall on Crataegus leaves. Cecidomyia resinicola,0. S., is interesting 

 because the larvae occur in pitch masses. Many speeies belonging to this 

 group may be bred from buds or leaves and a few, as mentioned in the pre- 

 ceding economic discussion, from seeds. We have reared a number of 

 species of Mycodiplosis and particularly of Lestodiplosis from various leaf 

 galls. The habits of these species .are not sufficiently well known so that 

 we feel certain that in every instance we have secured the form responsible 

 for the deformity. There is still need of much life history work in this 

 group before certain puzzles as to relationships and food habits can be sat- 

 isfactorily solved. 



