NORTH AMERICAN HOMOPTERA. 



299 



dusky tips, aud tarsi dusky; posterior pair dusky throughout. Prothorax with 

 lateral tubercles. Antennse 5-jointed; joint iii long, longer than iv plus the 

 basal part of v ; terminal part of v quite long, with several very small pores ; v 

 imbricated; cornicles short, cylindrical concolorous with body; cauda well 

 developed, pilose. 



i;(/(7 5 mm. long. Oval, shining black, though green when first laid. De- 

 posited on the twigs about the buds. 



Aphis coriiifoliae. 



On Nov. 1, 1892, I found numbers of this species on the leaves 

 and branches of the common Red Osier Dogwood {Cornus doloni- 

 fera). The forms present were the winged viviparous females (re- 

 turn migrants), winged males, oviparous females and eggs. Each 

 of these forms corresponded precisely with the descriptions of similar 

 forms taken in Illinois in 1887 recorded in the first of this series of 

 contributions.* The conditions were also the same as regards the 

 establishing the colonies of the oviparous females by the winged re- 

 turn migrants and the flying in of the males. No indications were 

 seen of the development of either of these winged forms on Cormis, 

 and I have no doubt that the species passes the Summer on some 

 other plant. 



Aphis inali Linn. 



Observations on the Autumn history of this species in New Hamp- 

 shire showed a condition of things exactly similar to what I have 

 found in Michigan, Illinois and Ohio during the last ten years. 

 Early in September the previously unoccupied apple leaves begin to 

 be colonized by winged return migrants that give birth to the ovi- 

 parous females. Later the males fly in. The eggs are deposited on 

 the twigs and buds. 



Oviparous Female.— Body 1.4 mm. long; 0.7 mm. wide; antennte. 0.6 mm. long. 

 Commonest color of fully matured specimens chromium green (Eidg. x, 12), but 

 some specimens light apple green (Eidg. x, 20, but lighter) aud more rarely a 

 brown form occurs. In the green specimens the antennae and legs are dusky, 

 especially toward their tips ; and there is a more or less distinct yellowish brown 

 patch at the base of the cornicles. Cornicles rather short, slightly flanged at 

 tip; darker than body. Third joint of antennaj a little more than twice as long 

 as fourth; basal part of fifth distinctly shorter than fourth ; apical part of fifth 

 distinctly longer than third. Eostrum reaching as far as anterior margin of 

 posterior coxae ; dusky at tip. Style short, dusky. 



Described from many living specimens ovipositing on twigs of 

 Fyrus malus at Hanover, N. H., Nov. 7, 1892. 



Winged Viviparous Female. Return Migrant.— Body 2 mm. long; head to tip 

 of folded wings, 4.2 mm. ; antenna?, 1.2 mm.; wing expanse, 1 mm. Head and 

 thorax black, with connecting membrane greenish; abdomen apple-green or oil- 

 green, usually latter, with marginal rows of black spots on dorsum. In older 

 specimens that have nearly finished bearing young, the abdomen may become 



* Psyche, vol. v, pp. 123-125. 



TBANS. AM. ENT. SOC. XX. NOVEMBEK, 1893. 



