16 Bulletin 2: Springfield Museum. 



the blade tissues. The thickened sac-like veins are really the galls, 

 opening by slits above. Pubescent. On leaves of hazelnut, Corylus 

 americana. One specimen. September. 



Cecidomyia? squamulicola, n. s. Hazel catkin gall. Fig. 14. 



A gall which deforms the base of the sterile catkins, increasing the 

 size of the scale, so the diameter of the catkin is twice or thrice the normal. 

 Not uncommon on hazelnut, Corylus americana. September. 



Betula lenta. 



Hamamelistes spinosus Shimer. 



See account of this species under Hamamelis virginiana, further on. 



Betula lutea. 

 Eriophyes betulae n. s. Bud gall of birch. Fig. 15. 



Without scientific name, Hagen, Can. ent., 1885, v. 17, p. "25. 



Eriophyes, sp., Jarvis, 37th ami. rept. Ent. sqc. Ontario 1906, p. 59, pi. A, tig. 6. 



An abnormal growth of the buds, the terminal growth being checked, 

 forming considerable masses of undeveloped buds. On yellow birch, 

 Betula lutea. Common. 



Alnus rugosa. 

 Dasyneura serrulatae Osten Sacken. Alder bud-gall. Fig. 16. 



Cecidomyia serrulatae Osten Sacken, in Loew's Mon. dipt. X. A., 1st:.', pt. 1, p. 198. 



Beutemmiller, Bull. Amer. mus. nat. hist., 1892, v. 1, p. 264, pi. 13, fig. -I: 



Ins. galls vicin. X. V., 1904, p. '21, fig. 

 Jarvis, 37th aim. rept. Ent. soc. Ontario, 1906, p. 68. 

 Dasyneura serrulatae Felt, ■.'.'id rept. ins. N. Y. f. 1907, 1908, p. 336, ^">l . 



A deformation of the terminal bud. Rounded, very pubescent, brown, 

 10-15 mm. in diameter. Not common. On Alnus rugosa. Galls collected 

 in October, kept on moist earth, gave a fly the following April. 



FAGACEAE. 

 Pagus americana. 

 Eriophyes? ferruginea Farlow. Beech mite-gall. 



Erineum ferrugineum Farlow, Hagen, Can. cut.. 1885, v. 17. p. 26. 

 Without scientific name. Garman, Psyche, 1892, v. 6, p. 246. 

 Eriophyes, sp., Jarvis, 37th aim. rept. Ent. soe. Ontario 1906, p. 62. 



The upper side of the leaf is discolored and somewhat depressed above 

 the clusters of granules which on the under side are very numerous. The 

 mites feed among these granules. At first white, "frosty," later brown. 

 On beech, Fagus americana. 



Castanea dentata. 



Eriophyes dentaiae n. s. Chestnut leaf gall. Fig. 17. 



Eriophyes, sp., Jan i^. 38th aim. rept. Ent. soc. Ontario, 1907, p. '.»•'!. 



A small, rough, monothalamous gall on the leaf. Woody, circular, 

 projecting more above, 2-:'. mm. in diameter, usually surrounded by a 

 light ling. Larval cell held in place by radiating libers. Usually several 

 on a leaf of chestnut, Castanea denta la . 



