482 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



A LIST OF THE APHIDID^ OF ILLINOIS, WITH NOTES 

 ON SOME OF THE SPECIES 



By John J. Davis, Office of the State Entomologist, Urbana, Illinois. 



(Continued from ]). 419) 



In the first part of this paper (Jour. Econ. Ent., Vol. Ill, Oct., 1910, 

 p. 410) Pemphigus corrugatans Sirrine was questionably listed from 

 Illinois. I have since had an opportunity, through the courtesy of 

 Mr. J. T. Monell, to examine cotypes of P. corrugatans in Monell's 

 collection and find that my Le Roy specimens are not that species. 

 Plate 31, figures 1 and 2 are camera lucida drawings of the wing and 

 antenna from the cotypes mentioned above. The label on the slide 

 examined is as follows, — "454^* cotypes Pemphigus corrugatans. 

 Winged adults, pupa, and larvae of II? From curled colored leaves 

 of Crataegus coccinea var. I. A. C. 6-26-93. In balsam. F. A. S." 

 Plate 31, figures 3 and 4 were drawn from winged viviparous females 

 of a Pemphigus corrugating the leaves of Crataegus sp. at LeRoy, 

 111., July 7, 1907. This latter may be Fitch's P. pyri. 



'^ Aphis apocyyii Koch: Thomas 8th Rept. St. Ent. 111. (1880), 

 p. 94. The Apocynum aphis characterized by Thomas is probably 

 not Koch's apocyni and it is still to be proven that the European 

 species occurs in America. First reported by Thomas. 



*A. asclepiadis Fitch: Oestlund, Bull. Geol., and Nat. Hist. Surv. 

 Minn. No. 4 (1887), p. 60. A very common species on Asclepias. 



A. atriplicis Linn.: Hayhurst, Annals Ent. Soc. Amer., Vol. II 

 (1909), p. 88, figs. Common on Chenopodium album throughout the 

 state, especially common in southern Illinois. First reported by 

 Monell. 



A. avence Fab.: Pergande, Bull. Div. Ent., U. S. D. A., No. 44 

 (1904), p. 5, figs. A common wheat aphis but rarely destructively 

 abundant. First reported by Forbes. 



A. bakeri Cowen: Gillette, Jour. Econ. Ent., Vol. I (1908), p. 364, 

 figs.; Davis, Annals Ent. Soc. Amer., Vol. I (1908), p. 259, figs. A 

 common species throughout the state on red clover. First reported 

 by the writer. 



A. brassic(B Linn.: Weed, Insect Life, Vol. Ill (1890), p. 289, 1 fig.; 

 Sanborn, Kans. Uni. Sci. Bull., Vol. Ill (1904), p. 54, 1 fig. Our 

 most generally destructive aphis of the vegetable gardens, and a 

 most difficultly controlled one in the commercial gardens, the" ex- 

 penses of fighting the aphis soon using up the small profit which is to 

 be made. First reported by Thomas(?). 



*A.6remSand.: 13th Ann. Rept. Del. Agr. Expt. Sta. 1901 (1902), 



