Volume II contains the insects, which are treated by the following

authors: _Hymenoptera_, J. H. Comstock and L. O. Howard; _Coleoptera_, George Dimmock; _Lepidoptera_, H'y Edwards and C. H. Fernald; _Diptera_, S. W. Williston; _Orthoptera_, C. V. Riley; _Hemiptera_, P. R. Uhler; _Neuroptera_, A. S. Packard; _Arachnida_, J. H. Emerton.

J. H. COMSTOCK.--An Introduction to Entomology. Published by the author. Ithaca, N. Y. 2 parts. Part I, 1888.

ALPHEUS HYATT AND J. M. ARMS.--Guides for Science Teaching, No. III. Insecta. Bos. Soc. Nat. Hist. D. C. Heath & Co., Boston, 1890.

GENERAL WORKS ON CLASSIFICATION.

HYMENOPTERA.

E. T. CRESSON.--Synopsis of the Families and Genera of the Hymenoptera of America, north of Mexico, together with a Catalogue of the described Species and Bibliography. Transactions Am. Entom. Society, Supplementary volume. 2 parts. Philadelphia, 1887.

COLEOPTERA.

JOHN L. LE CONTE AND GEORGE H. HORN.--Classification of the Coleoptera of North America. Prepared for the Smithsonian Institution. Washington, Smithsonian Institution, 1883.

This is the most recent and the only complete classification of North American Coleoptera. It contains also Appendix II, a "list of bibliographical references to memoirs, in which more or less complete synopses of the families, genera, and species of the Coleoptera of the United States have been published."

J. T. LACORDAIRE.--Histoire naturelle des Insectes. Genera des Coleopteres, ou expose methodique et critique de tous les genres proposes jusqu'ici dans cet ordre d'insectes. [Completed by J. Chapuis.] Paris, France, 1854-1876. 12 vols, and 1 vol. plates.

[Out of print.]WILLIAM LE BARON.--Outlines of Entomology, published in connection with the author's Annual Reports upon injurious insects. Part first. Including the Order of Coleoptera. Fourth Annual Report on the Noxious and Beneficial Insects of the State of Illinois. Sep. Edit. Springfield, 1874.

LEPIDOPTERA.

G. A. W. HERRICH-SCHAEFFER.--Sammlung neuer oder wenig bekannter aussereuropaeischer Schmetterlinge. Vol. I. Regensburg, 1850-'58; Vol. II, Pt. 1, 1869.

Contains a classification of the Lepidoptera, which forms the basis of our present arrangement.

JOHN G. MORRIS.--Synopsis of the described Lepidoptera of North America.