June, '11] DAVIS : Illinois aphidid^ 327 



which Thomas seems to have confused in his description of Siphono- 

 phora asclepiadis Fitch. ^ 



•^M. calendula} Monl.: Bull. Geol. and Geog. Surv. Vol. V, No. 1 

 (1879), p. 21. Mr. Monell {loc. cit.) determined specimens collected 

 in Illinois as questionably this species. I am unacquainted with it. 



M. cerealis Kalt. : Pergande, Bull. Div. Ent. U. S. Dept. Agr. No. 

 44 (1904), p. 18. I have been unable to separate this species from 

 granaria, and although I believe the two synonymous, leave them 

 distinct for the present. First reported by Pergande. 



M. circumfleximi Buck. ( = ? Myzusvincce Gil.): Buckton, Mono- 

 graph of British Aphides, Vol. I (1876), p. 130, col. figs.; Gillette, Can. 

 Ent. Vol. XL (1908), p. 19, figs. What I consider this species is found 

 in greenhouses in Illinois, and is often destructively abundant on 

 dahlia, easter lily, Vinca, and maiden-hair fern {Adiantum). First 

 reported by the writer. 



*M. cratcegi Monl.: Bull. U. S. Geol. and Geog. Surv. Vol. V 

 (1879), p. 20. I found this species common on the under surface of 

 the leaves of Cratcegus in the Chicago parks. It was not, however, 

 sufficiently common to be injurious. I believe this species has not 

 been reported since the original description by Monell. Prof. W. T. 

 Clarke, in his "List of California Aphididce"'^ fists Aphis cratcegi 

 Monl. from California. He doubtless had another species as Monell's 

 cratcegi is a true Macrosiphum. The antenna of the wingless vivi- 

 parous female is shown in PL 10, fig. 6. 



*ilf. curcuhitce Thos.: 8th Rep. State Ent. 111. (1880), p. 67. Very 

 common and sometimes destructive to squash vines. Usually, how- 

 ever, they do not become injuriously abundant until in the fall when 

 the plants are fully matured, and fruit nearly ripe. First reported by 

 Thomas. 



M. cynoshati Oestl. : Davis, Annals, Ent. Soc. America, Vol. II 

 (1909), p. 38, figs. Colonizes on tender terminal twigs and leaves of 

 the common ornamental currant (Ribes aureum), often seriously 

 stunting the growth. First reported by the writer. 



*M. erigeroneyisis Thos. : Sanborn, Kans. Univ. Sci. Bull. Vol. 

 Ill (1904), p. 76, figs. Common on Erigeron canadense throughout 

 the state. First reported by Thomas. 



'^M. fragarice Koch. var. immacidata Riley: Rural World, Decem- 

 ber 11, 1875. This variety was described by Doctor Riley in the 

 Rural World, characterizing it as different from fragarice Koch by the 

 absence of black lateral abdominal spots in the winged female, and in 



1 8th Rept. State Ent. Illinois, 1880, p. 58. 



2 Can. Ent. Vol. XXXV (1903), p. 250. 



