THE CANADIAN ENTOMOLOGIST 305 



NEW SPECIES OF RHODITES FROM OREGON. 



BY WILLIAM BEUTENMULLER. NEW YORK. 



Rhodites oregonensis, sp. no v. 



Female. — Head black, coarsely rugoso-punctate and finely 

 pubescent. Antennae 14-jointed, black. Thorax jet black, shin- 

 ing, minutely rugose with larger punctures, pubescent. Parapsidal 

 grooves continuous, very distinct, and moderately widely apart 

 at the scutellum. Median groove distinct, gradually becoming 

 finer forwardly, especially between the anterior parallel lines, and 

 practically lost at the collar. Anterior .parallel lines fine and 

 close to the median groove. Lateral groove very fine and scarcely 

 defined. Pleurae finely rugose with a large, smooth, polished area. 

 Scutellum subopaque, black, finely and evenly rugose, basal 

 fovea wanting. Abdomen rufous, terminal segment blackish, 

 microscopically punctate on the dorsal half of the last four seg- 

 ments, lower half and basal segments smooth. The punctured 

 segments are clothed with yellowish decumbent hairs at their 

 bases laterally, ventral sheath black, plough-shaped and extend- 

 ing beyond the last segment. Dorsum and venter rather sharply 

 keeled with the sides moderately rounded. Legs rufous, tarsi 

 dark brown-black. Wings yellowish, hyaline, veins dark brown 

 and stout, transverse veins, slightly infuscated. Radial area 

 closed, cubitus not continuous. Areolet large. Length 4.50 mm. 



Gall. — (Plate, IX, Figs. 1-6). On the tip of the twigs or in 

 the seed-pods of Rosa nutkana. Monothalamous. Red, smooth, 

 elongate or subspindle-shaped with the apex rather sharply pointed 

 and broader at the base, sometimes with the apex more or less 

 rounded. It is an elongated malformation of a bud. Larval 

 chamber large and situated at the base of the gall. (Figs. 1-4). 

 When in the seed-pod the gall is somewhat like the kernel of a wheat 

 or oat, and is densely covered with short, hairy filaments. The 

 entire seed-pod, as a general rule, is completely filled with galls, 

 closely packed together, sometimes causing the pod to burst open 

 when the galls therein reach maturity. (Figs. 5-6.) 



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



It is a very distinct species allied to Rhodites rosce, nodulosus 

 and verna. There are no differences between the flies I bred from 



September, 1918 



