51 
APHIDIDAl. 
Benj. D. Walsh. — On the genera of Aphidse found in the United 
States. <Proc. Ent. Soc. Phil., Yol. 1, 1861-’63, pp. 294-310. 
Cyrus Thomas. — Notes of the Plaut lice found in the United States. 
CTrans. 111. Hortic. Soc., 1877, pp. 137-212. 
A review of the family, including the Psyllidm ; reproduces the descriptions 
of earlier authors, and adds descriptions of new species. 
Cyrus Thomas — A list of the species of the tribe Aphidini, family 
Aphidae, found in the United States, which have been heretofore 
named, with descriptions of some new species. <Illiuois State 
Laboratory of Nat. History, Bulletin No. 2, 1878, pp. 3-16. 
Ch. Y. Biley and J. Monell. — Notes on the Aphididte of the United 
States, with descriptions of species occurring West of the Missis- 
sippi. <Bull. U. S. Geol. and Geogr. Survey of the Terr., Yol. Y, 
No. 1, 1879, pp. 1-32, 2 pi. 
Riley gives the biology and description of several Pemphiginae ; Monell, de- 
scriptions, with occasional tables, of a number of Aphidinse. 
Cyrus Thomas. — Eighth Beport of the State Entomologist on the 
noxious and beneficial insects of the State of Illinois. Third Annual 
Beport, by Cyrus Thomas, Springfield, 1879. 
The report treats wholly on the Aphididse of the United States and is an en- 
largement of the author’s paper in the Trans. 111. Hortic. Soc., 1877. 
Geo. B. Buckton.— Monograph of the British Aphides. 4 vols. Bay 
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 Aphididte of Minnesota. <Bull. 
No. 4 Geol. and Nat. Hist. Survey of Minn., Saint Paul, 1887. 
coccida:. 
Y. SiGNORET. — Essai sur les Cochenilles. <Ann. Soc. Ent. de France, 
1868-’76. 
J. H. Comstock. — Beport on Scale Insects. < Annual Beport of the 
Commissioner of Agriculture for the year 1880, Washington, 1881, 
pp. 276-349, plates. 
• 
J. H. Comstock. — Second Beport on Scale Insects, including a mono- 
graph of the sub-family Diaspinse of the family Coccidm and a list, 
with notes, of the other species of Scale Insects found in North 
America. <Secoud Beport of the Cornell University Experiment 
Station, 1882-’83, Ithaca, N. Y., 1883, pp. 47-143, Plates I-IY. 
