8 Bulletin 2: Springfield Museum. 



Picea canadensis. 

 Adelges abietis Linn. Spruce gall. Fig. 1. 



Cherme8 abietis Linnaeus, Syst n:tt., 1767, v. 1, pt. 2, p. 738. 



Cholodkow9ky, Zool. unzeiger, 1894, jatarg. 17, p. 434 437; 1896, band 19, 



p. 37 -40. 

 Fernald, 9ih aim. rept. Hatch exp. sta., 1897, p. 85-86; 34th aim. rept. 



Mass. agr. coll f. 1896, [Mass.— Pub. doc, no. 31, 1896], 1897, p. 89- 



100, pi. 1-2 

 Gillette, Bull. 47, Col. agr. exp. sta., 1898. p. £6-37. 

 Lochhead, 30th ann. rept. Ent. soc. Ontario, 1899, p. 60-6!, fig. 8. 

 Gillette, Bull. 31, Div. ent., U. S. dept. agr., 1902, p. 52-53. 

 Jarvis, 37th ann. rept. Ent. soc. Ontario, ]y06, p. 63. 

 Adelges abietis, Pnckard, Bull. 7, U. S. ent. comm., 18S1, p. 235; 5th rept. U. S. ent- 



coirini., 1890, p. 853 

 Kieffer, Ann. Soc ent. France, 1902, v. 10, p. 377, 554. 



These galls are swellings of the base of the needles. Poly thai anions. 

 In July the galls- dry, the cavities open and the insects escape. On white 

 and black spruce, Picea canadensis and P. inariana. 



Picea inariana. 

 Adelges abietis Linn. See above. 



S A LI C ALES. 



SALICACEAE. 

 Populus. 

 Pemphigus populicaidis Fitch. Poplar stem-gall. 



Pemphigus populicaidis Fitch, 5th rept. ins. X. Y. for 1858, 1859, p. 845. 

 Walsh, Proc. Ent. soc. Phil., 1862, v. 1, p. 305. 

 Walsh and Riley, Amer. ent., 1869, v. 1, p. 57, 245. 

 LeBaron, 3d rept. ins. 111., 1873, p. 193. 

 Thomas, Trans. Dept. agr. 111. f. 1878, 1879, n. s., v. 8 (Thomas, 3d 



rept. ins. 111.), p. 149. 

 Henry, Amer. ent., 1880, v. 3 (s. 2, v. 1), p. 205-206, fig. 110. (The 



figure by Riley) 

 Oestlund, Bull. 4, Geol. and nat. hist. surv. Minn., 1S87, p. 21. 

 Packard, 5tl) rept. U. S. ent. comm., 1890, p. 471. 

 Cook, Ohio nat., 1903, v. 3, p. 425-426, fig. 57-58; 1904, v. 4, p. 118. 



124; 29th ann. rept. Dept. geol. and nat. res. Indiana f. 



1904, 1905, p. 849, fig. 41. 

 Jarvis, 87th ann. rept. Ent soc. Ontario, 1906, p. 64, pi. C, fig. 3. 



An irregularly spherical gall at union of blade and petiole. The open- 

 ing is closed by a twisting of the leaf. Common on several poplars. 

 The insects emerge when the gall dries somewhat and opens, usually 

 about the middle of the summer. 

 Pemphigus transversus Riley, Poplar petiole gall. 



Pemphigus populi-transversus Riley, Bull. U. S. geol. and geog. surv. terr., 1879, v. 5, p. 



15-16, pi. 2, fig. 5. 

 Oestlund, Bull. 4, Geol. and nat. hist. surv. Minn., 1887, p. 21. 

 Packard, 5th rept. U. S. ent. comm., 1890, p. 43-1. 

 Cook, Ohio nat., 1903, v. 3, p. 425426, fig. 65 56; 1904, v. 4, p. 



118, 124: 29th. ann. rept. Dept. geol. and nat. res. 



Indiana f. 1904, 1905, p. 850, fig. 42. 



This oval gall is formed midway of the petiole, on one side, with the 

 opening opposite the petiole and transverse. Not common. On poplar, 

 Populus. 



