166 The Ottawa Naturalist [Feb. 



in apparently fungous affected galls on the leaves of aster and 

 goldenrod. 



.4. carbonijera Felt. Gall oval, dark brown or jet black, 

 \ inch long, on the somewhat thickened leaves of Solidago 

 lanceolata. This is the undescribed Cecidomyia carbonijera of 

 Osten Sacken; also listed as Lasioptera and Baldratia. 



A. aster ijoliae Beutm. Gall about \ inch in diameter, 

 an oval, yellowish white and dark margined, apparently fungous 

 affected blister on the leaf of Aster later iflorus. Described as 

 Lasioptera; listed also as Choristoneura Helena and Baldratia 

 fuscoanulata. 



A. agrostis O.S. A cone-shaped abortion of a stem accom- 

 panied by an approximation and dwarfing of the leaves of 

 Muhlenbergia. Described as Cecidomyia, also as Lasioptera 

 muhlenbergiae Marten . 



TRIBE DASYNEURIARIAE. 



A large assemblage of species easily separated from the 

 preceding tribe by the almost uniform absence of scales on 

 costa, and the third vein always well separated therefrom. 

 The antennae are cylindric, never binodose in the male, while 

 the claws are invariably toothed. Antennal segments from 12 

 to over 20. Palpi uni-to quadriarticulate. Many of the species 

 live in stem or bud galls. 



Rhabdophaga Westw. 



This genus is represented by a great number of large, 

 usually reddish brown forms with 14 or more antennal segments; 

 the flagellate ones of the male stemmed. This group intergrades 

 with Dasyneura, the more typical members being separated 

 therefrom by the usually tapering, nearly straight third vein 

 uniting with the costa very near to or at the wing apex. Rhab- 

 dophaga displays a marked preference for willow, living mostly 

 in subcortical tissues or apical bud galls. 



R. triticoides Walsh. Gall an irregular stem enlargement 

 \ to 14 inches long and about \ inch in diameter, resembling 

 somewhat a head of wheat. Described as Cecidomyia. Synonym : 

 C. hordeoides Walsh. 



R. nodula Walsh. Gall a nodular swelling, visually encir- 

 cling the base of the smaller branches and with a diameter of 

 about } an inch. Described as Cecidomyia. 



R. salicis Schrk. Gall an irregular swelling on basket 

 willow. An introduced species. 



R. batatas Walsh. Gall a very irregular, polythalamous en- 

 largement on the shoots of the low swamp willow. It varies 

 greatly in size and somewhat in shape. Described as Cecidom- 

 yia. 



