302 [December 



prothorax. Prothorax and thorax with a narrow lateral vitta commencing at the 

 eyes, passing just inside the base of the wings, and converging on the scutel. and 

 another dorsal one, black. Abdomen with about seven dorsal black fascise at the 

 tips of the joints, the basal and several of the terminal ones often interrupted or 

 obsolete, occasionally only three present. Honey-tubes fuscous, scarcely as long 

 as the tarsi. Legs_yellow, femora with an anterior black vitta, abbreviated at tip, 

 and a terminal and subterminal black fascia above; tibise and tarsi black. Wings 

 hyaline, stigma generally yellowish; subcostal and three discoidals coal-black, 

 very robust, subequal, except at the origin of the third discoidal where the subcos- 

 tal is fine and paler, and the third discoidal hyaline for a short space; costal vein 

 black, less robust, tapering to the base of the stigma, whence it becomes subobso- 

 lete. Hind wings with all the veins slender, subhyaline. Length .07 — .09 inch; 

 to tip of wings .15 — .17 inch, expanse .30 — .35 inch. 



The stigma is three times as long as wide, moderately acute at each end. 



DiiFers from Aphis betu/xcolens Fitch not only generically, but in the two 



costal veins being black, not "sulphur-yellow", and from all aphidians 



known to me in the costals and 3 discoidals being subequal in robustness. 



In one wing of one specimen the 2nd discoidal has a short branch on its 



basal side. Described from 25 recent specimens. Occurred abundantly, 



in company with its larva, on the leaves of a species of birch (betula 



nigra) in August. The dried farva resembles the imago, except that the 



markings of the body are more or less obsolete, and is not gregarious. 



CALLIPTERUS Koch. 



CaJIipfcrus carycUus Fitch, (hickory) N. Y. Rep. I, p. 165 and II, §167. 

 — C. punctateUus Fitch, (hickory) ibid., and II, §168. — C. maculrllas 

 Fitch, (hickory) ibid. I, p. 166 and II, §169. — C. fumlpcnnellus Fitch, 

 (hickory) ibid., and II, §170. — C. marginellns Fitch, (hickory) ibid., and 

 II, §171. — C. mucidus Fitch, (apple) ibid. II, §20. — C castancne Fitch, 

 (chestnut) ibid. II, §199. 7 species. 



LACHNUS Illiger. 



Lachnus carjjx Harris, (pig-nut hickory) Inj. Ins. p. 190 and Fitch, 

 N. Y. Rep. II, §162.— /v. strohi Fitch, (pine) N. Y. Rep. §256 (:=erio- 

 soma strobi, N. Y. Cat. Homopt. p. 69.). — L. hiririfix Fitch, (larch) N. 

 Y. Rep. II, §288. — L. abiefis Fitch, (abies nigra) N. Y. Cat. Horn. p. 67, 

 winged insect unknown. — L. quenifoUpe Fitch, (white oak) ibid. — L. sa/i- 

 cellis [ita] Fitch, (willow) ibid. — L. afnifoh'x Fitch, (alder) ibid. — L. id- 



mi Linn, (elm) ibid. — L. popult Linn, (populus grandidentata) ibid. 



9 species. 



