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51 
APHIDID A. 
Beng. D. WALSH.—On the genera of Aphid found in the United 
States. <Proc. Ent. Soc. Phil., Vol. 1, 186163, pp. 294-310. 
Cyrus THOMAS.—Notes of the Plaut-lice found in the United States. 
<Trans. Ill. Hortic. Soc., 1877, pp. 137-212. 
A review of the family, including the Psyllidw ; reproduces tke descriptions 
of earlier authors, and adds descriptions of new species. 
Cyrus THOMAS.—A list of the species of the tribe Aphidini, family 
Aphid, found in the United States, which have been heretofore 
named, with descriptions of some new species. <lIllinois State 
Laboratory of Nat. History, Bulletin No. 2, 1878, pp. 3-16. 
Cu. V. RILEY AND J. MONELL.—Notes on the Aphidide of the United 
States, with descriptions of species occurring West of the Missis- 
sippi. <Bull. U.S. Geol. and Geogr. Survey of the Terr., Vol. V, 
No. 1, 1879, pp. 1-32, 2 pl. 
Riley gives the biology and description of several Pemphiginz ; Monell, de- 
scriptions, with occasional tables, of a number of Aphidinz. 
Cyrus THOMAS.—Eighth Report of the State Entomologist on the 
noxious and beneficial insects of the State of Illinois. Third Annual 
Report, by Cyrus Thomas, Springfield, 1879. 
The report treats wholly on the Aphididz of the United States and is an en- 
largement of the author’s paper in the Trans. Ill. Hortic. Soc., 1877. 
Go. B. BuckToN.—Monograph of the British Aphides. 4 vols. Ray 
Society, London, 1875-83. 
This is the latest European work on this family, containing tables for the de- 
termination of the genera. 
O. W. OESTLUND.—Synopsis of the Aphididze of Minnesota. <Bull. 
No. 4 Geol. and Nat. Hist. Survey of Minn., Saint Paul, 1887. 
COCCID #. 
V. SIGNORET.—Essai sur les Cochenilles. <Ann. Soc. Ent. de France, 
1868-76. 
J. H. ComstTock.—-Report on Scale Insects. <Annual Report of the 
Commissioner of Agriculture for the year 1880, Washington, 1881, 
pp. 276-349, plates. 
J. H. Comstock.—Second Report on Scale Insects, including a mono- 
graph of the sub-family Diaspine of the family Coccide and alist, 
with notes, of the other species of Scale Insects found in North 
America. <Second Report of the Cornell University Experiment 
Station, 188283, Ithaca, N. Y., 1883, pp. 47-143, Plates I-IV. 
