224 



NEW YORK STATE MUSEUM 



Trisliormomyia johnsoni Felt 



1907 Felt, E. P. New Species of Cecidomyiidae II, p. 18-19 (Hormomyia) 



1908 N. Y. State Mus. Bui. 124, p. 299-300, 388 (Hormomyia) 



This species was taken at Aubumdale, Mass., May 28, 1906 by 

 Prof. C. W. Johnson. 



Male. Length 5 mm. Antennae extending to the fourth abdom- 

 inal segment, sparsely haired, dark brown; fourteen segments, the 



fifth (fig. 47) with stems one and one- 

 fourth and three-fourths times their 

 diameters; terminal segment produced, 

 the distal portion of the stem with a 

 small subglobular enlargement. Cir- 

 cumfila, especially on the distal enlarge- 

 ment, very irregular. Palpi; the first 

 segment short, subrectangular, the second 

 about as long as the third, the third more 

 than twice the length of the second, more 

 slender. Face, dark reddish brown. Mes- 

 onotum dark brown, the submedian lines 

 narrow, fuscous yellowish. Scutelltim 

 brown, reddish apically and laterally, 

 postscutellum dark brown, reddish apic- 

 ally. Abdomen sparsely haired, shining 

 black. Genitalia reddish brown, the term- 

 inal clasp segment distally, black. Wings 

 (pi. 14, fig. 3) hyaline, costa reddish 

 brown, the third vein just beyond the 

 apex. Halteres pale reddish yellow ba- 

 sally, slightly fuscous apically. Legs a 

 variable fuscous yellowish, the distal tarsal 

 segments darker. Genitalia; basal clasp 

 segment long, slender, a quadrate lobe at 

 the basal third; terminal clasp segment long, stout; dorsal plate short, 

 broad, deeply and broadly incised, the lobes broadly rounded; ventral 

 plate spatulate apically, broadly rounded laterally, truncate distally. 

 Type Cecid. 821. 



Trishormomyia crataegifolia Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 160 (Hormomyia) 



1908 N. Y. State Mus. Bui. 124, p. 388 (Hormomyia) 



1908 Jarvis, T. D. Ent. Soc. Ont., 38th Rep't, p. 86 (Hormomyia) 



1909 Felt, E. P. Ent. Soc. Ont., 39th Rep't, p. 45 (Hormomyia) 

 1909 Jarvis, T. D. Ent. Soc. Ont., 39th Rep't, p. 83 (Hormomyia) 

 191 5 Felt, E. P. N. Y. State Mus. Bui. 175, pi. 3, fig. 8 (Hormomyia) 

 1918 N. Y. State Mus. Bui 200, p. 136 (Hormomyia) 



This species was reared in early April 1907 from deep-red larvae 

 which deserted cockscomb galls on Crataegus leaves the preceding 



Fig. 47 Trishormomyia 

 johnsoni, sixth antennal seg- 

 ment of male, only one seta 

 sketched in (enlarged, orig- 

 inal) 



