December, '10] DAVIS: ILLINOIS aphidid.e 487 



I sent him and that they were perfectly identical with the insect he saw, when he 

 published for it Scopolis Cypeosis. With doubt he referred it to Aphis vittis Scop- 

 oli, P. Ent. Soc. vol. 1. There is no specific identity between this and the foreign 

 insects as appears from the above description made from a thorough examination 

 of hundreds of living insects, and as it is found in various parts of the state I would 

 propose for it the specific name, illinoisensis." 



*A. impatientis Thos.: 8th Rept. State Ent. 111. (1880), p. 98. 

 First reported by Thomas and not since reported in literature except 

 in catalogues. I am unacquainted with the species. 



*A. lonicerce Monl.: Bull. U. S. Geol. and Geog. Surv., Vol. V, 

 No. 1 (1879), p. 26; Oestlund, Bull. Geol. and Nat. Hist. Surv., Minn., 

 No. 4 (1887), p. 55. This interesting and peculiar aphid I have 

 taken but once, namely at Oak Park, 111., July 16, 1910, on Lonicera 

 sp. At this time only wingless were found, and they were extremely 

 abundant on the tender terminal shoots and leaves, more commonly 

 on the former. The newer leaves have the sides curled upwards 

 forming a pseudogall within which the aphids were also found. The 

 colonies and individual aphids are covered with a heavy pulverulence. 

 When the Lonicera shrub was examined a second time (23 Aug., 

 1910), only three immature individuals were found. The species 

 is neither a typical Aphis nor Chaitophorus (in which latter genus 

 Thomas placed it), but it unquestionably fits better in the former 

 genus. Camera lucida drawings of the antennae, hind tibia and 

 tarsus cornicle, style and head of the wingless viviparous female 

 are given in Plates 31-32, figures 6, 7, 8, 9 and 10, respectively. 



^^A. lutescens Monl.: Bull. U. S. Geol. and Geog. Surv., Vol. V 

 (1879), p. 23. I have taken this species twice in the vicinity of 

 Chicago, on Asclepias. First reported by Monell. 



A. maidis Fitch: Davis, Tech. Bull. Bur. Ent., U. S. D. A., No. 

 12, pt. VIII (1909), p. 144. Common on various weeds and grasses 

 as well as on corn, broom corn, and sorghum, throughout the state. 

 On the three cultivated plants mentioned it is often injurious, par- 

 ticularly so on broom corn where it discolors the broom, thus damag- 

 ing the quahty of brush. First reported by Thomas. 



'A. maidi-radicis Forbes: 18th Rept. St. Ent. 111. (1894), p. 58, 

 figs.; Davis loc. cit. p. 123. One of the most destructive corn pests 

 in Illinois; also of prime importance as an aster insect, having been 

 found kiUing thousands of plants in single fields of asters in the vicin- 

 ity of Chicago. First reported by Walsh. 



*A. medicaginis Koch: Thomas, 8th Rept. St. Ent. 111. (1880), 

 p. 101. This has proven a very important enemy of the black locust, 

 which is grown extensively in the Chicago parks as shrubbery. The 

 lice cluster on the tender terminal shoots and may become so abun- 



Illinois one of the type localities. 



