490 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 5 



Winged viviparous female. — Head and thorax black. Abdomen dark reddish 

 brown with the posterior end darkening to blackish. Abdomen with a row of three 

 small but conspicuous white pulverulent spots on each side of the median and ante- 

 rior to the cornicles; also many other white pulverulent dots on the abdomen, 

 but they are rather inconspicuous and easily rubbed off. Antennae black; not reach- 

 ing the base of the cornicles; relative lengths of antennal segments as in wingless;: 

 segment III with about 14 circular sensoria, more or less in a row, and the usual 

 ones at distal ends of V and base VI. Legs with the femur blackish excepting basal 

 end, tibia whitish or pale brownish with the distal one third or one half blackish,, 

 tarsus black. Wing veins dark, stigma blackish. Style black. Cornicles black, 

 cylindrical, and reaching to the base of the style. 



*A. prunifolice Fitch: 1st Report Insects N. Y. (1855), p. 122. I 

 have taken this species but once, namely on plum at Niles Center^ 

 111., June 18, 1908. 



*A. sorbi Kalt.: Sanderson, 13th Rep. Del. Agr. Exp. Sta., 1901 

 (1902), p. 149, 4 figs. A rather uncommon species, which I have 

 taken only in northern Illinois. 



'A. quercifolicB Walsh: Proc. Ent. Soc. Phil. Vol. I (1862), p. 298. 

 I am unacquainted with this species. First reported by Walsh. 



A. rufomaculata Wils.: Ent. News, Vol. XIX (1908), p. 261. A 

 serious pest of the greenhouse chrysanthemum. First reported by 

 the writer. 



*A. sambucifolice Fitch: Sanborn, Kans. Univ. Sci. Bull. Vol. Ill, 

 No. 1 (1904), p. 52, 2 figs. A very common species attacking the, 

 ornamental elder in the Chicago parks, but is not a serious pest. 

 The sexual forms, the small winged males, and the wingless oviparous 

 females, appear in September and October in northern Illinois, usually 

 becoming mature the latter part of September. 



^A. salicicola Thos.: 8th Rep. State Ent. 111. (1880), p. 63 (Siphon- 

 ophora). A common willow aphis in Illinois. First reported by 

 Thomas. 



'A. setarice Thos.: 8th Rep. State Ent. 111. (1880), p. 56; Oestlund 

 Bull. Geol. and Nat. Hist. Surv. Minn. No. 4 (1887), p. 67. A very 

 common species, occurring throughout the state. First reported by 

 Thomas. 



*A. spircBella Schout. ?? In the Journal of Economic Entomol- 

 ogy for October, 1910 (p. 404), Professor Gillette has noted this 

 species as occurring in America. It has been very abundant and de- 

 structive on Spircea vanhouttei and S. salicifolia in many parts of 

 Illinois and after a careful study and comparison with the original 

 description of spirceella^ I consider it distinct but will leave it as 

 above until specimens of the European species can be obtained (my 

 efforts in this connection have thus far been useless) for comparison. 

 The most noteworthy differences are in the antennal lengths which 



» Zoologisches Anzeiger, Vol. 25 (1902), pp. 656-657. 



