8 PAPERS ON APHIDID.E. 



Described from five spocimoiis. Typos inoiinlod on five balsam 

 slides, in the collection of the Bureau of Entomoloj^y, V. S. Dej)art- 

 ment of Agriculture. La Fayette, Ind., 1910. 



Genus TOXOPTERA Koch. 



Seven species of the genus Toxoptera have been described, the one 

 described in this paper being the eighth. All, with the exce])tion of 

 this last and T. caricis Fullaway, occur in Euro])e, while only three 

 (T. graminum, T. aurantii, and T. muhlenhergisc) are known to 

 America. T. caricis was doscribotl from s])e('imens collected in 

 Hawaii. The following table may be of service to other workers: 



* KEY TO THE GENUS. 



I. General colur of apterous viviy)ar()us t'omalo.s black or dark rusty. 



a. Apterous females dark rusty; margin of aixlomen bearing tuberculate hairs; 



wing veins pale fuscous, stigma white scirpi Passerini. 



On Scirpus spccicrum and S. lacuatna. 

 aa. Apterous females black; margin of abdomen not bearing tuberculatehairs. 

 b. Sixth antennal segment of winged female equal to one-sixth the terminal 

 filament; wing veins and stigma fuscous; fork of cubital vein arising 

 before the point where the stigmal vein originates. 



aurantii Boyer de Fonscolombe. 

 On orange, citron, and Camellia. 

 Syn. T. auranlix Koch. 



T. camdlix Kaltenbach. 

 Ceylonia theaccola Buckton. 

 hb. Sixth antennal segment of winged female equal to one-fifth the terminal 

 filament; wing veins and stigma not fuscous, pale yellowish; fork of cubital 

 vein arising opposite or beyond the origin of the stigmal vein. 



clematidis Del Guercio. 

 On ornamental Clematis. 



II. General color green, yellow, or brownish yellow. 



a. Body of wingless viviparous female dark green, variegated with shining black. 



Stigma green variegata Del Guercio. 



On Rhamnus alaternus. 

 aa. Body uniformly green, yellow, or brownish yellow. 

 b. Style bkick, at least in the winged vivij)ar()us female. 



c. Body of wingless viviparous female uniformly dark green; style black. 



alaterna Del Guercio. 

 On Rhamnus alaternus. 

 cc. Body of wingless viviparous female brownish yellow, paler at the margins; 

 style darker than body color; cornicles veiy large, extending beyond tip 



of style, much constricted at base and apex caricis Fullaway. 



On Carcx sp. 

 hb. Style green, yellow, or but slightly dusky. 



d. Cornicles uniformly pale greenish or yellowish green; iisually a small 

 yellowish area on Ihe abdomen at base of each cornicle; the media 

 (third discoidal) branching at about three-fifths the distance from 

 the base of the vein to the tip of the wing; antennal segments III 

 and "VI filament " subequal. i\fales wingless. . .muhlenbergisn n. sp. 

 On Muhlenbergia'ap. 

 dd. Cornicles blackish at tip; the media (third discoidal) branching at 

 about one-half, or less, the distance from the base of the vein to the 

 tip of the wing; antennal segment "VI filament" noticeably longer 



than III. Males winged graminum Rondani. 



On wheat, oats, rye, barley, and various grasses. 



