330 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



p. 49; Weed, Psyche Vol. 5 (1889), p. 127. A very common species 

 in Illinois, it being especially noticeable on cultivated lettuce, Lactuca 

 scar tola, cultivated garden aster, Aster drummondi, and Ambrosia 

 irifida. First reported by Thomas. 



M. sanhorni Gil.: Can. Ent. Vol. XXXX (1908), p. 65, figs.; 

 Sanborn, Kans. Univ. Sci. Bull. (1904), p. 73, figs. (M. chrysanthemi.) 

 One of the most common and destructive pests of chrysanthemum, 

 both in greenhouses and out-of-doors. First reported by the ^vriter. 



*M. solanifolii Ashm.: Patch, Bull. Me. Agr. Exp. Sta. No. 147 

 (1907), p. 251, figs. Although not commonly and generally a pest of 

 the potato in Illinois, I have occasionally found it exceptionally and 

 injuriously abundant. 



^M. tanaceti Linn.: Although Thomas mentions this species in 

 the Eighth Illinois report, there is no indication that he actually 

 found it. 



*M. tilm Mon.: Bull. U. S. Geol. and Geog. Surv. Vol. V (1879), 

 p. 20. I have taken this rare species on two occasions on the under 

 sides of linden leaves in the Chicago parks. 



M. trifoUi Perg.: Bull. Div. Ent. U. S. Dept. Agr. No. 44 (1904), 

 p. 21, figs. First reported by Forbes. 



ilf . ulmarice Schr. (pisi Kalt.) : Sanderson, Can. Ent. Vol. 33 

 (1901), p. 31. Common in Illinois on red clover (Trifolium pratense), 

 white sweet-clover {Melilotus alba), sweet peas and garden peas, it 

 being especially destructive to the two last mentioned. First reported 

 by Thomas. 



m. verhence Thos.: Bull. 111. State Lab. Nat. Hist. Vol. I, art. 

 2, p. 8. This species has not been reported since the original collec- 

 tion. First reported by Thomas. 



W. viticola Thos.: 8th Rep. State Ent. 111. (1880), p. 55. A 

 common grape louse, often exceecUngly abundant. First reported by 

 Thomas. See discussion under Aphis illinoiensis. 



Addenda. 



*Rhopalosiphu'm pace Gillette. — Can. Ent. Vol. XL. (1908). p. 61, 

 Figs. 10. Wingless adults, immature and pupae were found abundant 

 on blue grass {Poa pratensis) at Aurora, 111., November 14, 1910. 

 Found in sheltered places, under conditions almost identical with 

 those reported by Professor Gillette, {loc. cit.) 



Hyadaphis pastinacce Linn. — Since writing on this species (see page 

 493 of the Journal, Vol. 3) Prof. O. W. Oestlund has kindly ex- 

 amined his Siphocoryne archangeliccr and in a letter of December 19, 

 1910, he says that it has the dorsal tubercles and is doubtless the 

 same as H. salicis Monl. He further states, "What I take to be a 



