REPORT OF THE STATE ENTOMOLOGIST 1918 227 
Trishormomyia helianthi Brodie 
1894 Brodie, William. Biol. Rev. of Ont., 1: 44-46 (Cecidomyia) 
1909 Jarvis, T. D. Ent. Soc. Ont., 39th Rep’t, p. 83 (Cecidomyia) 
1913 Felt, E.P. Can. Ent., 40:418 (Hormomyia) 
1918 N: Y. State Mus. Bul. 200, p. 206, 207 (Hormomyia) 
This species produces on Helianthus more or less cylindrical 
flask-shaped galls (fig. 49, pl. r1, fig. 2) having a length of 10 to 25 
mm and a diameter of from 1.5 to 5 mm. There may be one to ten 
galls in an axile, firmly attached to the stem by an expanded base 
and projecting in various directions, usually upwards, often at right 

Fig. 49 Trishormomyia helianthi, 
tubular galls on Helianthus (author’s 
illustration) 
angles to the stem, and occasionally downward. They occur on the 
upper third of the stems of H. decapetalus and H. divari- 
catus. They are also found on H. annuus. The gall has been 
collected about Toronto, Canada, Evanston, IIl., and Salt Lake City, 
Utah. It is local at Evanston, Ill, occurring in September (L. H. 
Weld). 
Trishormomyia bulla Felt 
1867 Walsh, B.D. Ent. Soc. Phila. Proc., 6:226 (Cecidomyia) 
1894 Brodie, William. Biol. Rev. of Ont., 1:74 (Cecidomyia) 
1909 Jarvis, T. D. Ent. Soc. Ont., 39th Rep’t, p. 83 (Cecidomyia) 
1912 Cosens, A. Can. Inst. Trans., 9:317 (Cecidomyia) 
1914 Felt, E. P. Can. Ent., 46:286-87 (Hormomyia) 
1918 ————__ N.Y. State Mus. Bul. 200, p..206 (Hormomyia) 
This species produces subglobular yellowish galls (plewnhpligens) 
about the size of large peas on Helianthus leaves, the deformities 
being about equally prominent on both surfaces and irregularly 
located, however, usually near the midrib. The gall has been 
recorded from Ontario, Canada, and Evanston, Ill. It occurs com- 
monly in July on plants in a deep rich soil at North Evanston, Ill. 
15 
