410 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 3 



Mo. (1872), p. 30, figs. Common but of little economic importance in 

 Illinois. First reported by Walsh. 



^ Chermes pinifolice Fitch: Patch, Bull. Maine Agr. Expt. Sta. 

 No. 173 (1910), p. 277, 9 figs. Thomas named this species abieti- 

 colens, quoting the brief and unsatisfactory description of the gall as 

 given by Packard and reproduced Packard's figure. Packard found 

 the species in Maine and there is no reason to believe that Thomas 

 found it in Illinois, as Hunter has supposed in his catalogue. 



C. pinicorticis Fitch: Storment, 20th Kept. St. Ent. 111. (1897), 

 Appendix, pp. III-XXVI, figs. First reported by Walsh. 



^Geoica squamosa Hart: 18th Kept. St. Ent. 111. (1894), p. 98, 

 5 figs. Common on grass roots and occasionally on corn roots, but 

 never, to my knowledge, in sufficient numbers to be injurious. First 

 reported by Forbes. 



* Hamamelistes spinosus Shimer; Pergande, Tech. Bull. Div. Ent., 

 U. S. Dept. Agr., No. 9, p. 25, 12 figs. I have found this species very 

 common on cultivated witch-hazel at Chicago, and wild witch-hazel 

 growing in a timber at Kankakee. Of little economic importance. 

 First reported by Shimer. 



* Pemphigus aceris Monk: Can. Ent., Vol. XIV (1882), p. 16. First 

 reported by Monell. 



* P. hetce Doane: Bull. 42, Wash. Agr. Expt. Sta. (1900), p. 3, 

 1 fig. Last September (1909) I collected wingless individuals of what 

 I then determined as Tychea hrevicornis Hart on the roots of Bidens 

 vulgata at Oak Park, 111. At that time only wingless forms were 

 found. Later in the fall (Oct. 9), winged specimens were found on the 

 roots of the same group of plants, a species I have determined as P. 

 hetce after comparison with specimens received from Professor Gillette. 

 The observations, although scanty, would seem to indicate the possi- 

 ble synonymy of the two species. 



* P. corrugatans Sirr. (?): la. Acad. Sci., f. 1893, Vol. I, pt. IV 

 (1894), p. 129. What I have been calling Pemphigus pyri? was 

 found at Le Roy, 111., July 7, 1907, corrugating the leaves of Cratcegus 

 sp. The pseudo galls and winged viviparous females agree fairly 

 well with the description given by Sirrine for P. corrugatans, excepting 

 the relative lengths of the antennal segments IV and V. In my Le Roy 

 specimens segment IV is invariably slightly longer than V, while in the 

 description of corrugatans, Sirrine gives Segment IV, .13 mm. and V, 

 .17 mm. long. 



* P.formicarius Walsh: Proc. Ent. Soc. Phila., Vol. I (1862), p. 308. 

 This is an unknown species, it not having been reported since Walsh's 

 original description. First reported by Walsh from Rock Island, 111. 



* P. formicetorum Walsh: loc. cit. p. 308. Nothing known of this 



