BIOLOGICAL STUDIES ON THREE APHIDID^. 139 



1S86. Hunt. Thomas F. — Partial economic bibliography of lutliaii corn insects. 

 Miscellaneous Essays on Economic Entomology by the State Entomolo- 

 gist and his Assistants. <Trans. Dept. Agr. 111., Springfielcl, Vol. 

 XXIII, pp. 117-118. Separate: Springfield, 111., 1886. 



Gives a bibliography, partially analytical, of Aphis maidis (root and aerial 

 forms ) . 



1886. Webster, F. M. — Insects affecting the corn crop. <35th Ann. Rep. lud. 



State Bd. Agr. for 1885, Indianapolis, Vol. XXVII, pp. 183-184. 



Bibliography of the corn aphis, Aphis maidis Fitch (root and aerial forms). 

 Notes and general discussion, including observations on the relation of corn 

 root-aphis and ants. 



1887. CoMSTOCK. J. H. — Relations of ants and aphids. <Amer, Nat., Philadel- 



phia, Pa., Vol. XXI, p. 382. 



Reference to the dependence of the corn root-aphis upon the ant. 



1887. Forbes, S. A. — Relations of ants and aphids. <Amer. Nat., Philadelphia, 



Pa., Vol. XXI, pp. 579-580. 



Eggs of Aphis maidis (?), root form, found in a nest of Lasius alienus. 

 Ants rear young aphides, before ground is planted to corn, upon the roots of 

 Setaria and Polygonum, transferring them afterwards to corn. 



*1887. Weed, C. M. — Insects affecting corn. <Weekly Press, Philadelphia, Pa., 

 September 21, 1887. 



Apliis maidis (?), root form, hibernates in the egg stage. 



1888. CoMSTOCK, J. H. — An introduction to entomology. <Ithaca, N. Y., pp. 



168-169. 



Mentions observations of Forbes with regard to the relations of ants and 

 corn root-aphides. 



18SS. Webster, F. M. — Report on the season's observations, and especially upon 

 corn insects. <Ann. Rep. U. S. Comm. Agr. for 1887, Washington, D. C, 

 pp. 148-149. 



Rhopalosiphiim maidis; considerable damage done by the root form in 

 Louisiana and Mississippi. Found it on roots of grass (Setaria ylauca). 

 Three species of ants attend these aphides, viz, Lasius fiavus, Formica 

 schaufussii, and F. fusca. Remedies : Proper fertilizers applied to the soil are 

 a general preventive. 



1888. Webster, F. M. — Relation of ants to the corn aphis. <Iusect Life, U. S. 

 Dept. Agr., Washington, D. C, Vol. I, pp. 152-153. 



Reply to an article by Professor Comstock in American Naturalist. Explains 

 in detail the part played by the ant in the distribution of the corn root-aphis 

 and the care of the eggs of the latter by the ant. 



1888. Weed, C. M. — On the occurrence of aptei'ous males among the Aphididse. 



<Amer. Nat., Philadelphia, Pa., Vol. XXII, p. 70. 

 Aphis iiinidis, root form, has apterous males. 



1889. Alwood, W. B. — The corn plant-louse. <The Southern Planter, Rich- 



mond, Va., August. 1889, pp. 11(:>-117. 



Article in response fo an inquiry from a farmer in that State (Virginia) 

 who had found the aerial and root forms of the corn aphis troubling his crops. 

 Gives ]if(> history, and suggi^sts remedy by destruction of fodder and stalks, 

 the plowing- up of all stubiile in the fall, and the putting of the field to small 

 grain next year. 



