U. S. I). A., U. E. Tech. Ser. 2r., Pt. IT. Issued Novemter 12. 1914. 



TAPEJIS ON ArHIDID K. 



THE YELLOW CLOVER APHIS. 



{('(illipleriiH Irifolii Moiiell.)' 



15y J. J. Davis, 

 EnlownUuiictil A.msttinf, Cereal and Forage Inserl Inresligalions. 



INTRODUCTION. 



Tlie yellow clover apliis, or pluut louse {Callipterus trifolii Monell), 

 is common and oftentimes abundant tlirougliout tlie eastern Jiall" of 

 the United States, although it ]ias never been considered a pest in 

 tJiis country and consequently little of its Hfe history and lia})its lias 

 l)een studied. The autlior takes tliis opportunity of gratefully 

 acknowledging the assistance of Air. Alfred F. Satterthwait and Dr. 

 Henry Fox, both of the Bureau of Entouiology, who continued tiie 

 experiments during the writer's absence. 



SYNONYMY. 



Callipterus trifolii was fu-st described by Mr. J. T. Monell (1882) ^ 

 from specimens collected at Washington, D. C, and forwarded to 

 liim by Mr. Theodore Pergande. Buckton (1899) described this 

 s{)ecies under the name ChaitopJ writs macvlatus from sjiecimens col- 

 lected in India on lucern, or what is known in America as alfalfa 

 {Medicago sativa). Dr. Bashambar Das, of the Government college, 

 Lahore, India, lias very kindly sent us specimens of maculatus 

 Buckton, collected on the type host })lant {Medicago sativa), and a 

 careful examiiiation lias shown no characters distinguishing it from 

 Moiiell's trifolii. Dr. Das writes that to Jiis knowledge tJie species 

 lias not been collected on Trifolivm in India. 



What will ])robably prove to be identical witli the species under 

 discussion was described by Kaltenbach ^ in 1846 as Aphis ononidis. 

 We have not as yet had an opportunity to examine tJie Euroi)ean 

 material relating to this sj)ecies, however, and thus prefer to leave 

 this question undecided until a comparison can be made. Should it 

 prove identical, it will naturally jiavo priority over both trifolii and 

 maculatus. 



• Synonym: Chaitophorus maculatus Buckton. 



'•' Dates in paronlhesis refer to Bihliofiraphy. p. 40. 



» Kaltenbaeh, J. II. EntomologLsfhe Zeitung, Stettin, JahrKiinj; 7, pp. 17;M74, June. lS4ti. 



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