December, '10] DAVIS: ILLINOIS aphidid.e 485 



Mr. Monell very kindly mounted some of the remains (from alco- 

 hol) of the specimens from which these notes were made, but they 

 are so shrunken as to be of little value in working out the characters. 



The species recently referred to by Professor Gillette as Aphis 

 cornifolice (Jour. Econ. Ent., Vol. Ill, Oct. 1910, p. 405) is not, in my 

 opinion the true cornifolice, but rather the helianthi of Monell. This 

 species has never been positively reported from Illinois, all records 

 of the occurrence of cornifolice in this state apparently referring to the 

 migrant form of helianthi. 



*A. cratcegifolice Fitch: Sanborn, Kans. Uni. Sci. Bull. Vol. Ill, 

 No. 1 (1904), p. 53, 1 fig. A common species on Cratcegns in the 

 Chicago parks. It curls the leaves and is often injuriously abundant. 



U. folsomii Davis: Ent. News, Vol. XIX (1908), p. 143, 1 pi. 

 Common at Urbana and Chicago attacking Virginia creeper. First 

 reported by the writer. 



A. forbesi Weed: Sanderson, 12th Ann. Rept. Del. Agr. Exper. 

 Sta. f., 1900 (1901), p. 143, 6 figs., 1 pi. Common throughout the 

 state, sometimes a serious pest. First reported by Forbes. 



A. gossypii Glov.: Pergande, Insect Life, Vol. 7 (1895), p. 309. 

 One of our most common and destructive aphids. In the western 

 part of the state in the melon fields, they do much damage annually. 

 In greenhouses they are often very injuriously abundant on cucum- 

 bers as well as on althaea. Hibiscus and Easter lily, especially in more 

 or less neglected houses. First reported by Forbes (as cucumeris). 



*^. houghtonensis Troop: Ent. News, Vol. XVII (1906), p. 59, 3 

 figs. This species was found very common, curling the leaves of 

 gooseberry shrubs growing wild at Aurora, 111., June 17 and 22, 1910. 

 The drawings by Mr, Heidemann in the article cited above represent 

 the general characters of the species exceedingly well. The antenna 

 of the winged viviparous female, showing the number and position 

 of the sensoria, is illustrated in PL 31, fig. 5. 



A. helianthi Monk: Bull. U. S. Geol. and Geog. Surv., Vol. V 

 (1879), p. 26; Weed, Psyche, Vol. V (1888), p. 123. This aphis is 

 very common on various species of Helianthus, especially H. grosse- 

 serratus, H. divaricatus, and H. annuus. The green aphis so common 

 on Cornus leaves in spring and fall is apparently the same species, 

 and not the A. cornifolice of Fitch as has been so commonly supposed. 

 See discussion above under cornifolice. Mr. Monell, who has spent 

 much time studying helianthi, both on Helianthus and on Cornus, is 

 also of the opinion that the green Aphis on Cornus is the spring and 

 fall form of A . helianthi. First reported by Weed (as cornifolice) . 



*A. illinoisensis Shimer: Prairie Farmer, Vol. 18, No. 20, Nov. 

 17, 1866, p. 316. Although not positively proven, it is my opinion 



