1862.] 803 



Lachnus caryae, Harris. 



I posses.s a *S (?) specimen of this fine, large species taken some years 

 since on the pig-nut hickory, and I have this autumn noticed numerous 

 apterous 9 9 on the same tree, which lived many days and laid their eggs 

 in confinement, but died without assuming wings. The abdomen of all 

 of them, when alive, was as Harris describes it, cinereous with four rows 

 of transverse black spots; in the dried specimen these generally disappear, 

 the whole abdomen becoming an obscure fuscous, and they are not noticed 

 in Dr. Fitch's description. The eggs are .06 — .08 long, nearly thrice as 

 long as wide, cylindrical, rounded at the end, and of a shining mahogany 

 color. 



I have also this autumn noticed numerous apterous 9 9 , apparently of 

 the same species, both on the oak and on the bass-wood ; and from the 

 oak I have obtained two winged % % , and from the bass-wood four, all in 

 company with apterous 9 9 • Singularly enough, the only specimen that 

 varies from the description is the one found on the hickory, which has 

 black not reddish-brown femora, except the anterior femur which is red- 

 dish-brown at base. Harris says that this species has no terminal stylet. 

 The % of course has none, but the apterous 9 has a short one, which is 

 sometimes visible even in the dried specimen. I suspect that the 9 is 

 normally apterous, as the specimens that I kept confined lived till after 

 Oct. 9th. 



ERIOSOMA Leach, =Myzoxylus i?fo^,=Schizoneura Ilartig. 



Eriosoma lanigcra Hausmanu (apple) Harris, Inj. Ins. p. 193, Fitch, 

 N. Y. Rep. II, §17 and N. Y. Cat. Hom. p. 67.—^. cary^v Fitch, (hick- 

 ory) N. Y. Rep. II, §161.—^. quprc! Fitch, (oak) ibid. §306.— j^. tes- 

 sellatn Fitch, (alnus rubra) N. Y. Cat. Hom. p. 68. — E. imhricator Fitch, 

 (beech) ibid. 5 species. 



There is considerable confusion in authors as to the characters of this 

 genus. Harris, quoting from Hausmann and Knapp, says that the adult 

 Eriosoma lanujcra, (apple-tree woolly-blight,) the type of the genus, never 

 acquires wings; (Inj. Ins. p. 194.) Westwood, in his Synopsis and in his 

 Introduction, assigns to it wings. Again, Westwood in his Synopsis says 

 "fore wings with simple oblique discoidal nerves," whereas Fitch says 

 that " Schizoneura" Hartig, or in English "forked-vein," is synonymous 

 with Eriosoma, (N. Y. Rep. I, p. 7, note,) and in his description of E. 

 querci he speaks of the fork of the third discoidal. Mr. A. Agassiz in- 



