THE CANADIAN ENTOMOLOGIST. l59 



Male — Except feet, entirely black; length, 2^ mm. ; otherwise like 

 females. 



Described from one bred specimen. 



R. FULGENS, n. sp. 



Gall unknown. 



Gall-flies. — All females, measuring from 2^ to 4 mm. in length; 

 general colour, rufous. Head, dark rufous, beneath the eyes and back of 

 the eyes at the sides of the vertex washed with blackish ; in small indi- 

 viduals the head is darker in colour, in some entirely black, with the excep- 

 tion of a narrow streak in the middle of the face ; there is also, in every 

 case but one, some rufous colouring upon the gen^e. Lower face rather 

 coarsely rugose, vertex and occiput finely rugose, ocelli and compound 

 eyes whitish, in one case red, in no case black ; antennae 14-jointed, the 

 first three joints rufous, the remainder black. Thorax, rufous quite dark 

 in the small individuals, parapsidal and median grooves well defined, all 

 extending to the collar ; ridges outside the parapsidal grooves and between 

 these and the median groove smooth and shining and sparsely punctured. 

 Under a power of 60 diameters these smooth polished portions are seen 

 to have the .fine network of impressed lines which is so constant in this 

 genus. Scutellum coarsely rugose towards the border, where it is blackish, 

 more finely rufous on the raised central portion ; no fovens, but the usual 

 transverse groove. Metathorax, a patch on mesopleura beneath the wings, 

 and sternum black ; in small specimens the whole mesopleura is black, 

 except a shining rufous spot beneath the wings, entire pleurge finely to 

 coarsely rugose. Abdomen rufous, somewhat blackish on dorsum and 

 venter, all the segments covered with the network of impressed lines, but 

 they are too fine to be seen with a low pov/er on the sides of the second 

 segment. Wings slightly and evenly smoky, nervures slender, with no 

 cloudiness surrounding them, brown in colour, the heaviest not being 

 black, areolet medium, radical cell not at all closed along the costal 

 margin. Feet, including coxte, entirely rufous, in the smallest and darkest 

 individuals the coxae somewhat blackish at base. 



Described from 1 7 flies sent me by Prof. J. M. Aldrich, from S. Dakota, 

 and 1 1 flies bred in this laboratory. The galls in both cases have been 

 lost or confused with others. The flies are at once separated from 

 R. vmltispinosa, R. aref actus, and what I suppose to be Riley's R. ticber- 

 culator, which they much resemble, by the polished mesothorax and the 

 greatly developed median groove. 



