December, '10] DAVIS: Illinois aphidid.e 495 



^R. solaniThos.: 8th Rep. State Ent. Illinois (1880), p. 73. Have 

 never taken this species, but an examination of the types in the State 

 Laboratory of Natural History proves it to be a distinct and good 

 species. First reported by Thomas. 



*R. sonchi Oestl. : 14th Ann. Rep. Geol. and Nat. Hist. Surv. Minn. 

 (1886), p. 34. Found on Sonchus rather commonly in northern 

 Illinois. 



*R. violce Perg.: Can. Ent. Vol. 32 (1900), p. 30. I found this 

 species quite common on cultivated violets in a greenhouse at Peoria, 

 111., September 24, 1910, the first and only record we have of its occur- 

 rence in Illinois. 



'^M. achijrantes Monl.: Bull. U. S. Geol. and Geog. Surv., Vol. V, 

 No. 1 (1879), p. 18. Pergande^ questionably places [this species 

 as a synonym of M. mahaleb and Gillette- has considered it the same 

 as M. persiccB. I am unacquainted with the species. First reported 

 by Forbes and Hart. 



M. cerasi Fabr.: Weed, Bull. Ohio Agr. Exp. Sta., Tech. Ser. Vol. 

 I, No. 2 (1890), p. Ill; Gillette, Jour. Econ. Ent. Vol. I (1908), p. 

 362, col. figs. First reported by Thomas. 



M. eloeagni Del Guer.: Gillette, Can. Ent*, Vol. XL (1908), p. 17, 

 figs. {M. braggii); Davis, Annals. Ent. Soc. Amer., Vol. I (1908), p. 

 251, figs. A common species attacking ornamental Russian olive 

 {Elceagnus augustifolia) and Shepherdia argentea, and although often 

 becoming quite abundant, seldom injures the plants attacked. First 

 reported by the writer. 



M. persic(B Sulz. ( = Rhop. dianthi Schr.): Gillette, Jour. Econ. 

 Ent., Vol. I (1908), p. 359, col. figs. A very common and often per- 

 nicious pest in gardens and greenhouses, those plants which I have 

 found it damaging most being cultivated snap dragon, carnation and 

 ornamental pepper in greenhouses; and cabbage, spinach, and egg 

 plant in the vegetable garden. I have examined what are probably 

 the types of Thomas' Rhop. tidipce, and they prove to be persicce Sulz. 

 First reported by Thomas. 



*M. plantagineus Pass. : I have taken this species on the common 

 plantains {Plantago rugelii and P. major) on several occasions at 

 L^rbana, LeRoy, and Aurora. It lives on the base of the leaf stalks, 

 on the under surface and near the ground, the aphid colonies often 

 being covered with a "tent" of earth and debris constructed by the 

 ants in attendance, usually the common field ant {Lasius n. ameri- 

 canus). Its habits are very much like those of the clover aphis {A. 

 hakeri). Doctor Mordwilko, to whom specimens were sent, has 



iBulI. U. S. Dept. Agr., Div. Ent. No. 7 (1897), p. 52. 

 jBuU. Colo. Agr. Exp. Sta. No. 133 (1908), p. 32. 



