414 * JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



species appears to be lost and it is doubtful if the species collected by 

 Thomas in Illinois is the same as that described by Fitch in New 

 York. 



'^L. strobi Fitch: 1st Kept. Ins. N. Y. (1855), p. 256; Weed, Bull. 

 Agr. Expt. Sta. Ohio, Tech. Ser., Vol. 1, No. 2 (1890), p. 116, figs. 

 This species has never been reported from Illinois except in Hunter's 

 Catalogue. 



^ Sipha flava Forbes: Davis, Tech. Ser. Bur. Ent., U. S. Dept. Agr., 

 No. 12, Pt. VIII (1909), p. 156. Common in Central Illinois on 

 various grasses, corn, wheat, sorghum, and broom corn. On the 

 latter two it often becomes destructive. First reported by Forbes. • 



* Brachycolus tritici Gillette Mss. I found this species common on 

 grass at Aurora, Illinois, Sept. 24, 1908. Specimens were sent to 

 Prof. C. P. Gillette, who replied that he had recently taken the species 

 and had described it in manuscript under the above name. 



^ Melanoxantherium smithice Monl.: Bull. U. S. Geol. and Geog. 

 Surv. No. 5 (1879), p. 32; Weed, Psyche, Vol. V (1889), p. 132. A 

 species which often becomes excessively abundant on the branches 

 of willow in the fall. In parks and other much frequented places 

 these insects are a serious nuisance because of the blood-red stain 

 caused when the soft-bodied aphids are crushed, this stain discoloring 

 and ruining the clothing. First reported by Monell. 



Chaitophorus aceris Linn.: Common on hard and Norway maples 

 in Northern Illinois and apparently becoming more common every 

 year. Although not a serious pest at present, it is likely to become 

 one within a few years. It is found on the maples throughout the year, 

 the sexual forms (winged male and wingless oviparous female) occurring 

 in September and October. The dimorphs were not observed, which, 

 however, may be accounted for by the fact that I was not able to 

 make continuous observations the past year (1909). After comparing 

 with sketches of the abdominal markings, as well as a specimen of 

 each of the winged and wingless viviparous females of Ch. aceris, 

 received from Doctor Del Guercio of Italy, I am inclined to consider 

 our species distinct from the European aceris, but further study is 

 necessary.^ First reported by Gillette. 



^ Ch. candicans Thos. : Mentioned by Thomas but never described, 

 hence nomina nuda. 



^ Ch. negundinis Thos.: Oestlund, Bull. Geol. and Nat. Hist. Surv. 



I In going over the species of Chaitophorus, with a view of monographing the 

 genus, the writer has found many difficulties, necessitating studies continued through- 

 out the year to determine the constancy of the color patterns and measurements. 

 This is especially true of the poplar Chaitophorus of which we likely have several 

 und escribed species. 



