306 THE CANADIAN ENTOMOLOGIST 



the twig galls from those in the seed-pods. The galls were sent 

 to me in February, 1917, and the flies began to emerge indoors 

 from February 28th until late in March. I also received galls in 

 July collected by Mr. Thompson, who deserves credit for dis- 

 covering this interesting new species as well as the three follow'ing 

 species. 



Rhodites ashmeadi, sp. nov. 



Female. — Head black, finely and evenly granulate. Antennae 

 black, 14-jointed. Thorax black, very slightly shining, minutely 

 granulate, with larger punctures. Parapsidal grooves fine and 

 sharply defined, running almost parallel from the collar to the 

 scutellum where they suddenly curved inwardly but are rather 

 'widely apart at this point. Median groove fine, and running 

 from the scutellum to about the ends of the anterior parallel lines 

 and are obliterated anteriorly. Anterior parallel lines very fine 

 and scarcely e\ident, and widely separated. Lateral grooves 

 exceedingly fine. Scutellum opaque, very finely and evenly 

 rugose, granulated not more so than the thorax, basal fovea want- 

 ing. Pleura; black, finely granulated with a smooth, polished 

 area. Abdomen rufous, terminal segments and dorsum darker, 

 terminal segments, punctate, and with short, yellowish, decumbent 

 hairs, and more sharply keeled than the basal segments. Ventral 

 spine not extending beyond the last segment. Wings dusky 

 hyaline, radial cell yellowish brown and a small cloud beyond. 

 Radial area closed. Cubitus continuous. Areolet distinct. Length 

 3-3.50 mm. 



Gall. — (Plate IX, Figs. 7-10). On the stems of Rosa mitkana. 

 Polythalamous. A hard, fusiform swelling of the twig varying 

 from 12-30 mm. in length, and from 4-7 mm. in width. It is 

 hard and woody like the stem and has numerous cells inside. 

 (Fig. 7.) Externally it is red and smooth like the stem. 



Habitat.— CorvaWis, Oregon. (B. G. Thompson). 



The galls were received from Mr. B. G. Thompson early in 

 February, 1917, and the flies emerged from the latter part of this 

 month until April 7th, 1917. Named in honor of the late Dr. 

 W. H. Ashmead, who helped me so much in my studies of the 

 Cynipidae. 



