l6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



In addition to the works mentioned above, the reader is 

 referred to the following publications issued by institutions and 

 societies. These are not usually available at book stores, but can 

 sometimes be procured from second-hand dealers, and may be 

 found in the larger libraries. The first two are bibliographies, 

 and contain a great many references to important papers on the 

 Hymenoptera. 



A list of Works on North American Entomology. N. Banks. U. S. 

 Department Agriculture, Bureau of Entomology, Bull. No. 8i. 120 

 pages. Washington, 1910. 



Bibliography of the More Important Contributions to American Eco- 

 nomic Entomology. S. Henshaw and N. Banks. 8 Parts. 1318 

 pages. Washington, 1889-1905. 



A Study of Insect Parasitism. L. O. Howard. U. S. Department 

 Agriculture, Bureau of Entomology, Technical Series, Bull. No. 15. 

 57 pages, 24 figures. Washington. , 



The Economic Status of Insects as a Class. L. O. Howard. Science, 

 Vol. 9 (N. S.), pages 233-247, 1899. 



Life Zones and Crop Zones of the United States. C. H. Merriam. 

 U. S. Department Agriculture, Biological Survey, Bull. No. 10. 559 

 pages, map. Washington, 1898. 



Index to the Known Fossil Insects of the World, including Myriapods 

 and Arachnids. S. H. Scudder. U. S. Geological Survey, Bull. 

 No. 71. 744 pages. Washington, 1891. 



Synopsis of the Families and Genera of the Hymenoptera of America, 

 North of Mexico. E. T. Cresson. vi -f 350 pages. American 

 Entomological Society, Philadelphia, 1887. 



Synopsis of American Wasps. Henri de Saussure. xxxv + 385 pages, 

 4 plates. Smithsonian Institution, Washington, 1875. 



A Monograph of the North American Proctotrypidae. W. H. Ash- 

 mead. U. S. National Museum, Bull. No. 45. 472 pages, 18 

 plates. Washington, 1893. 



Qassification of the Ichneumon Flies or the Superfamily Ichneumo- 

 noidea. W. H. Ashmead. Proc. U. S. National Museum, Vol. 23. 

 viii + 220 pages. Washington, 1900. 



Insects Collected from the Flowers of Fruit Trees and Plants. W. E. 

 Britton and Henry L. Viereck. Report of Connecticut Agricul- 

 tural Experiment Station, pages 207-224. New Haven, Conn., 1905. 



Directions for Collecting and Preserving Insects. U. S. National 

 Museum, Bull. No. 67. xiii + 135 pages. Washington, 1909. 



