Uo. I. ] American Blight. 53 



with her young. These insects are capable of bearing extreme cold, 

 and it would appear that where they hibernate in the open bark, their 

 downy covering increases much in quantity. 



SCHIZONEURA LANIGERA, 



{Aphis), Hausmann, Illiger's Mag. Insekt,, i, 1S02, p. 440 ; Banks, 

 Hortic. Soe. Trans.^ ii, p. 162, til; Kirby & Spence, Introd. Ent., 

 6 eel., 1828, i, p. 29, 200 ; ii, p. 225 ; iii, p. 182 : Hints on Orchards, 

 Salisbury, 1816, p. 39 : Andouin, Ann. Soc. Ent. Fr., iv, p. 9. App. : 

 Goureau, Bull. Soc. Ent. Fr. (2 s.) x. 1852, p. Ixxix. 



(Schizoneura) Hartig, Germar's zeitschr. Ent., iii, 1841, p. 367 i 

 Kaltenbach, Mou. Pflanzen, i, p. 169 : "Walker, Cat. Horn., iv, p. 1048 : 

 Biickton, Aphides, iii, p. 89, t. 105, 106 : Saunders, Insects injurious to 

 Fruits, 1883, p. 13, 27, f. 1, 13, 14. 



[Eriosoma) . Ruricola (Curtis), Gardener's Chronicle, iv^ Feb. 1844, 

 p. 116, f. 1—3: Glover, Rep. Dep. Agric, Unit. States, 1877, p. 38, 

 f. 41. 



Mali, Coccus, Bingley, Anini. Biogr., iii, 1803, p. 200: {Eriosoma), 

 Samouelle, Compend., i, 1819, p. 16: Mosley, Gardener's Chronicle, 

 i, p. 828 : {Myzoxylus), Blot, Mem. Soc. Linn. Calvados, i, 1824, p. 

 114; id., Mem. Soc. Agric. Caen, 1830, p. 58: Am. and Serv., Hist. 

 Nat. Ins. Hem., 1844, p. 612 : Tougard, Ann. Soc. Hortic. Paris, xiv, 

 p. 341. 



Pyri [Eriosoma), Fitch, The Senate, 30, 1851, p. 68 : {Schizonenra) ; 

 Walker, Cat. Horn., iv, p. 1052 ; Suppl., p. 302 : {Pemphigus), Yiich, 

 Fourth Rep. N. Y. State Cab. N. H., 1851, p. 68: Walsh, Proc. Ent. 

 Soc. Philad., i, 1866; id., Practical Entomologist, 1866: Glover, 

 Rep. Dept. Agric. Unit. States 1879, p. 38 : Riley, Bull, Unit. States 

 Ent. Cora., vi, 1881, p. 59. 



Trunk and branch'inhahiting form. — Hausmann describes the form of 

 the first generation as having the body oval and strongly domed : head, 

 eyes, anteunse, rostrum and legs blackish ; thorax and abdomen deep 

 houey colour, shining, the latter covered with woolly whitish down. The 

 form of the second generation is winged, somewhat smaller and narrower 

 than that of the first generation, and a second form of the second gene- 

 ration differs in size and its lighter colour. M, Goureau, quoted by 

 Thomas, describes the stages thus : — 



" Apterous individuals— khont oue-tenth of an inch long; reddish brown and 

 covered above with a white, cottony secretion ; antennae short and pale yellow ; legs 

 yellowish; knees brown; without honey-tubes, but with a circular cicatrix in place 

 of them. 



" Winged individuals.-~'Antenr\se) shorter than the head and thorax, and 

 varying in colour from brown to black ; head and thorax black, a brownish ring at 



