BIOLOGY OF THE TERMITES OF THE EASTERN UNITED STATES. 83 
glass slides submerged in alcohol or immersed in water in a chamber 
made by gluing glass slides to thin slips of rectangular cover glass 
with heated balsam. In this water-tight compartment the speci- 
mens can be placed in vertical or horizontal positions. Ether is 
used to clear out the cell, which is filled with boiled water, thus 
avoiding the formation of air bubbles. If the specimens are placed 
head downward, movements of the antenne, due to vibration, can 
be avoided. Cells of various sizes are used, or one large cell can be 
utilized by placing thin slips of cover glass back of the specimens to 
hold them firmly in position. By clamping the cell to the lens 
holder of a dissecting microscope placed horizontally, focusing can 
be conveniently accomplished by adjustments of the screw. 
The best results are obtained by etherizing recently killed specimens 
that have not been placed in alcohol. A 72 millimeter focal length 
lens brings out the characters to the best advantage, if the enlarge- 
ment is 6 to 8 diameters. 
Many of the photographs were taken by Mr. H.S. Barber and some 
by Mr. H. B. Kirk at the eastern field station. Most of them, how- 
ever, were made by the photographic laboratory of the United 
States Department of Agriculture. 
BIBLIOGRAPHY .@ 
This bibliography consists mainly of publications on our native 
termites or closely allied species; some little-known publications are 
included. Hagen, up to 1860, Froggatt, Holmgren, Escherich, and 
Feytaud give extensive bibliographies. 
AnpREws, E. A., and Mrppieton, A. R. Rhythmic activity in termite communities. 
Johns Hopkins Univ. Circ., n. s., 1911, no. 2 (whole no. 232), p. 26-34, illus., 
February, 1911. 
ATKINSON, G. F. Some Carolina insects. Ist Rpt. So. Car. Exp. Sta. for 1888, 
p. 19-56, 1889. 
Banks, N. Two new termites. Ent. News, v. 17, no. 9, p. 336-337, illus., Novem- 
ber, 1906. Cryptotermes cavifrons, from Florida, and Termopsis laticeps, from 
Arizona, described. 
Brvie, G. White ants—termites eroding glass. Nature, v. 26, no. 675, p. 549, October 
5, 1882. 
Bucktey, 8. B. Description of two new species of termites from Texas. Proc. Ent. 
Soc. Phila., v. 1, p. 212-215, May, 1862 (1863). Hamitermes ( Termes) tubiformans, 
from Texas, p. 212, and EHutermes cinereus, from Texas, described. 
Casry, T. L. A new genus of termitophilous Staphylinide. Ann. N. Y. Acad. 
Sci., v. 4, p. 384-387, March, 1889. 
CoryYELL, J. R. The termite pest of the old world. Sci. Amer., v. 59, no. 10, p. 151, 
September 8, 1888, illus. 
Derry, D. E. Damage done to skulls and bones by termites. Nature, v. 86, no. 
2164, p. 245-246, April 20, 1911. 
Drxon, W. A. Protection from ‘‘white ants” and other pests. Nature, v. 85, no. 
2148, p. 271, December 29, 1910. 

a The references in the bibliography, as well as those in the footnotes, have been 
verified by the librarian of the Bureau of Entomology, Miss Mabel Colcord. 
