158 THK CANADIAN ENTOMOLOGIST. 



Described from twenty-one specimens bred from the galls. 



Males — Three to three and one-half mm. in length, black, feet more 

 reddish in colour than in the females, bases of the coxiB black, antennae 

 black throughout ; otherwise like the females. 



Described from forty-two bred specimens. 



There is one male among those reared that has the rufous marking of 

 the female on head, antennae and thorax. 



This species resembles very closely Rhodites nmltispinosa, Gill, but 

 the galls are very different. 



R. NEGLECTA, 71. Sp . 



The gall is an abrupt, corky enlargement of a small stem, and con- 

 tains numerous larval cells. The gall measures 15 mm. in breadth by 

 18 mm. in length, and is very smooth on the exterior. 



Described from a single gall taken at Manitou, Colorado, May 8, 1892. 

 The flies emerged on the 17th of the same month. 



I have long known what I suppose to be the same gall in Michigan 

 and Iowa, but never before succeeded in getting the gall-makers from 

 them. 



Gall-fly. — Female — Head black, except a little rufous upon the vertex 

 and clypeus ; face rather coarsely rugose, vertex and occiput finely 

 rugose ; antennae entirely black and 14-jointed. Thorax entirely black, 

 parapsidal grooves well defined and broadened anteriorly, median groove 

 traceable but a short distance from the scutellum. Surface of the meso- 

 thorax shining, but under a low power of the microscope is seen to have 

 a fine network of impressed lines and numerous shallow punctures over 

 the entire surface ; from each puncture arises a small yellowish hair. 

 Scutellum black, slightly rufous on middle of disk, coarsely rugose about 

 margin, less coarsely on the central raised portion. Pleurse and meso- 

 thorax black and coarsely to finely rugose, most finely on the central por- 

 tion of the^mesopleurae beneath the forewings. Abdomen black, except 

 sides of second segment near the base, the seventh segment and the 

 anterior portion of the venter. All the surface of the abdomen is covered 

 with a network of microscopic impressed lines. Wings slightly smoky, 

 radial area not at all closed along the costal margin. Feet rufous, except 

 coxae, which are blackish. Length, 23^ to 3 mm. 



Described from two bred females. 



