THE CANADIA.N ENTOMOLOGIST. 



205 



ON THE CABBAGE-SHAPED GALL OF CECIDOMYIA SALICIS- 

 BRASSICOIDES, AND ITS OCCUPANTS. 



BY C. H. TYLER TOWNSEND, BROWNSVILLE, TEXAS. 



On July 9, 1892, I found in the Grand Canon, Arizona, on the 

 Hance trail, near the Colorado River, numbers of the green galls of this 

 species on the narrow-leafed Salix sp. (probably S. longifolia). Three 

 that were picked on this date measure 19 to 20 mm. in length, and 11 

 mm. in width on widest portion near base. They preserve their light 

 green colour, except for their whitish, thick pubescence. Some last 

 year's galls were also found in the canon on the willows near the stone 

 cabin. They measure 16 to 17 mm. in length, and 10 to 1 1 mm. in 

 width. They are more spread out apically ; therefore not conical in 

 outline, and are reddish-brown in colour, probably from being weathered. 



Three galls of this species, from West Cliff, Colorado, sent me by 

 Mr. T. D. A. Cockerell, measure only 13 to 14 mm. in length, by 8 to 

 95^ mm. in greatest width, near base. They are well cone-shaped, but 

 reddish-brown in colour save for the grayish external pubescence. These 

 are mentioned by Mr. Cockerell in Entoin., 1890, p. 280. . 



Green galls of this cecid were found near Las Cruces, August 21, 

 1892, in great numbers on Saiix longifolia along the aceqiiia madre in 

 the Alam.eda. They were little more than one-half inch long at this date, 

 and were borne in numerous dense clusters of a dozen or more each. 

 On Nov. 13 and 14, 1892, over 200 of these galls were picked from the 

 willows in the above locality. Many of the clusters were on twigs that 

 had died, showing that the galls kill the new growth to a considerable 

 extent. Some were found on topmost twigs of the willow 10 feet high, 

 while others were within 3 or 4 feet of the ground and frequently in 

 masses. One thick bunch contained 21 galls. Eight of the smaller 

 sizes and seven of the larger, selected from these 200 galls, measure as 

 follows : — 



Larger 

 Galls. 



