764 EXPERIMENT STATION RECORD. [Vol.38 



all tii:» described Hemiptera, to and including the Chermidae, recorded from or 

 known to occur in America north of the southern boundary of the United States. 

 For the Heteroptera the Reuter classification of 1912 has been followed very 

 closely, but the author has found it desirable to reduce a number of the families 

 to subfamily rank. The international code has been foUow^ed in the determina- 

 tion of genotypes. A total of 3,198 accepted species are listed, of which 263 

 have been added since the publication of the author's check list in June, 1916 

 (E. S. R., 36, p. 550). The numbers given in the check list are retained and 

 additional species interpolated in fractional form. 



Additions and corrections are appended, together with a list of works cited 

 and indexes to the genera and higher group names and species. 



The review is by H. M. Parshley. 



Idiocerus scurra, a poplar leaf -hopper, E. L. Dickebson and H. B. Weiss 

 (Jour. N. Y. Ent. Soc, 25 {1911), No. 4, pp. 218-22^ pi. i).— This is a report 

 of morphological and biological studies of /. scurra (I. gemmisimulans), a 

 poplar leaf hopper introduced into this country from Europe which is becoming 

 more abundant and widely distributed in New Jersey, having been noted in 

 several cases occurring on poplars growing along city streets. 



Oonatocerus ovicenatus has been previously recorded as parasitizing its eggs 

 (E. S. R., 34, p. 657), and the authors have observed O. maga ovipositing in the 

 tissue directly over I. scurra eggs. 



The genus Ophiderma (Membracidae: Homoptera), E. H. Gibson and Emma 

 Wells (Jour. N. Y. Ent. Soc., 25 {1917), No. ^, pp. 199-20S).— The authors 

 recognize ten species of this genus as occurring in the United States, of which 

 two are described as new to science. 



The genus Harmostes, E. H. Gibson {Ent. News, 28 {1917), No. 10, pp. 4S9- 

 450). — A key is given for the separation of 16 species of this coreid genus, 

 eight of which occur north of Mexico, one being described as new. 



On the Chinese gall (Aphidi'dje), A. C. Baicer {Ent. News, 28 {1917), No. 9, 

 pp. 385S93, pi. 1). — The literature relating to galls produced by aphids on 

 Rhu^ semialata, which for many centuries have been an important article of 

 commerce in China, is brought together and the species compared with its well- 

 known relatives in this country. The galls produced by this aphid are eruployed 

 in dyeing and tanning, as well as in native medicines, and the export of these 

 galls in recent years has amounted to a million dollars annually. A list of 

 references appended consists of 35 titles. 



The corn root aphis and methods of controlling it, J. J. Davis {U. S. 

 Dept. Agr., Farmers' Bui. 891 {1917), pp. 12, figs. 6).— A practical summary 

 of information in which the life history of this plant louse and its association 

 with the cornfield ant {Lasius niger americanus) are graphically illustrated. 

 Control measures include crop rotation, early and deep spring plowing followed 

 by several deep diskings, the use of a substance offensive to the ants to be 

 applied with a chemical fertilizer to prevent their colonizing the aphids on 

 corn roots, and the maintenance of soil fertility through the use of barnyard 

 manure or other fertilizer as an aid in producing stronger plants. 



Control of the melon aphis, F. H. Chittenden {XJ. S. Dept. Agr., Farmer^ 

 Bill. 914 {1918), pp. 16, figs. 9). — A popular account of this pest with direc- 

 tions for its control. The use of 40 per cent nicotin sulphate, 3 fluid ounces; 

 water, 25 gal. ; and laundry soap, 1 lb., is said to have given the best results 

 thus far. The importance of using plenty of spray, 200 gal. to the acre, ap- 

 plied at high pressure, if possible, is emphasized. 



Cattle lice and how to eradicate them, M. Imes {U. S. Dept. Agr., Farmers' 

 Bui. 909 {1918), pp. 26, figs. 14). — A popular summary of information relative 

 to suctorial and biting lice, their life history and habits, and methods of 



