182 The Ottawa Naturalist. [March 



Oligotrophia Latr. 



Antennal segments 13 to 20, the flagellate ones stemmed in 

 the male, sessile in the female; palpi presumably triarticulate. 



0. betulae Winn. The larva occurs in inflated seeds of 

 white birch. An introduced species, previously referred to 

 Cecidomyia. 



Rhopalomyia Rubs. 



Antennal segments 12 to over 20, the flagellate ones stemmed 

 in the male, usually subsessile in the female; palpi uni- or 

 biarticulate. Members of this genus display a marked prefer- 

 ence for flower or bud galls, a large proportion of the species 

 occurring upon solidago. 



R. hirtipes O.S. The orange larvae occur in somewhat 

 nut dike apical galls on stunted solidago shoots, or more commonly 

 as smooth, brownish, subterranean swellings evidently develop- 

 ing from root stock buds and varying in size from \ to 1 \ inches 

 in diameter. Described as Cecidomyia. 



R. solidaginis Loew. A large apical rosette gall on solidago. 

 Described as Cecidomyia. 



R. racemicola O.S. Gall a greenish or reddish, subglobular, 

 bud-like enlargement about . 1 of an inch in diameter on solidago. 

 Described as Cecidomyia. 



R. anthophila O.S. Gall nearly cylindric, green, densely 

 pubescent, about \ of an inch long on solidago. Described as 

 Cecidomyia. 



R. antennariae Whir. Gall a corm-shaped apical bud de- 

 formity about of an inch in diameter on Antennaria. Described 

 as Cecidomyia. 



R. tridentatae Rubs. Produces an apical bud gall on Artem- 

 isia tridentata. 



R. alticola Ckll. Gall a subglobular, grayish, woolly en- 

 largement; diameter \ to \ inch, on Artemisia. Described as 

 Cecidomyia . 



R. gutierreziae Ckll. Gall a pale green, fusiform or suboval 

 swelling in the flower heads of Gutierrezia. Length \ inch, 

 diameter \ inch. 



R. bigeloviae Ckll. Reared from a hollow stem gall on 

 Bigelowia. Described as Cecidomyia. 



R. chrysopsidis Lw. The gall is apical, light brown, irregular, 

 woolly, about f of an inch in diameter and occurs on Chrysopsis 

 mariana. Described as Cecidomyia. 



TRIBE ASPHONDYLIARIAE. 



This tribe comprises mostlv large, heavy-bodied insects 

 easily recognized by the long, cylindric, sessile antennal segments 



