18 PAPERS ON APHIDIDiE, 



GENERK^ POSITION. 



WJietlior ()!• not Kaltenbacli's ononidis is specifically syiioiiymous 

 witli trifolii, it can still bo definitely placed in tlie same genus. Aphis 

 ononidis was described first by Kaltenbacli, and the species lias since 

 been placed in tlie genus Chaitophorus by Koch, Myzocallis by 

 Passerini, and Therioaphis by Walker. As Wilson^ has pointed out, 

 Therioaphis seems liardly suflRciently (Hstinct to bo placed as a 

 separate genus. Buckton described the species maculatus, which is 

 now consitlcred a synonym of trifolii, in the genus Chaitophorus , but 

 it is universally considered as not a member of this genus. Tiie 

 species trifolii was placed in the genus Callipterus by Monell, who 

 described the species, and it lias since been placed in the genus 

 Myzocallis by some autliors. This species can not be placed in 

 Mordwilko's generic table,^ but can be run down in Wilson's table ^ 

 to the genus Callipterus, although in tlie list of species Wilson places 

 trifolii Monell inider the genus Myzocallis. Likewise in studying 

 Wilson's synopsis of charactei-s of tlie genera this species can best 

 be placed in the genus Callipterus. All of the characters given for 

 tlie genus Callipterus agree reasonably well for trifolii, while this is 

 not the case with the characters given for the genus Myzocallis. 



We must tlierefore conclude that trifolii should be placed in Cal- 

 lipterus, although it is recognized as an intermediate species and not 

 a typical member of the genus. 



DISTRIBUTION. 



IN AMERICA. 



In America Callipterus trifolii is generally distributed throughout 

 the eastern half of the United States, except possibly in the extreme 

 southern portions. The species was originally described from Wash- 

 ington, D. C, and has since been reported in literature from Iowa 

 (Osborn and Sirrine) ; Delaware (Sanderson); Illinois, Minnesota, 

 Kansas, North Dakota, Virginia, Missouri, and New York (Davis); 

 Michigan and New York ( (lillotte) ; New Jersey ( Smith) ; Indiana 

 (Morrison); and Nebraska (Williams). In addition to these States 

 Mr. R. A. Vickery has taken it in North Carolina, Mr. George G. 

 Ainslie in South Carolina, Tennessee, and Kentucky, and Messrs. 

 E. O. G. KeUy and Paul Hayhurst in Maryland. Prof. F. M. Web- 

 ster found it in Indiana as early as 1887, our first record of its capture 

 after the original collections were made in 1880. The accompanying 



I Wilson, II. F. Can. Ent., vol. 42, no. 8, pp. 253-259, Aug., 1910. 



■' Mordwilko, A. Ann. Kept. Zool. Mus. Imperial Acad. Sci., vol. V.i, pp. 3.J3-3S4, Sept. 17, \<M)H. 



» Lot. cit. 



