















aximum ray of light. This consists of a glass vial 20 to 30 mm, in diameter, in 
foe open end of which a cone of thin celluloid is fitted, The glass vial is then 
itted into the opening in the cage. The three types of traps were sent to GC, F. 
furner who is conducting Hessian fly experiments at Nashville, Illinois. Mr. 
vrner tried them out and obtained Hessian fly in the traps as follows: 
Celluloid cylinders with vial trap - Avg. 15 per trap. 
Metal collar and cons with vial -~ Ave. 6 per trap. 
Glass vial with celluloid cone trap- Avg. 24 per trap. 
b Similar results were obtained by us in the case of gnats issuing from light 
oof cages and all of the results indicate clearly that the glass vial with cellu- 
loid cone trap which offers a maximum amount of light and at the same time has 
out @ swall opening at the entrance gives far better results than the metai traps 
hich permit orly a small ray of light entering the cage. It might also be stated 
that the celluloid cone trap is the simplest end most inexpensive of the three 
types tested. For some purposes a glass tube open at both ends will prove more 
convenient than the glass vials, the outer end to be closed with fine cheesecloth 
or a cork stopper. (John J. Davis.) 
LIBRARY - 
Miss Mabel Colcord, Librarian, 
NEW BOOKS. 
ma, o. C. Migration of insects to Rebecca Shoal light station and the 
Tortugas Islands, with specific reference +o mosquitoes and flies. 
Extracted from Publication No. 252 of the Carnegie Institution of 
Washington, 1918, p. 193-212. 
Barrows, 4. L. An unusual extention of the distribution of the shipworm in 
San Francisco Bay, California. Berkeley, 1917. p. 27-43 (Univ. 
of California publications in zoology v. 18, no. 2 ) 
‘Barton, W. H. and Stewart, W. P. Boll weevil as farm manager. Clemson 
College, So. Carolina. Exten. Div. in cooperation with the U. 8. Dept. 
Agr. Farmers’ reading course Bul. Bie. Site 
Belgivum-Mini store des colonies-Service de l'Agriculture, Etudes de biologie 
agricole. No. 3. Mayne, R. Insectes et autres animaux attaquant 
le cacaoyer au Congo Belge. London, 1917. 80p.illus., 5 pl. 
‘British museum (Natural history) Economic series no. 4.7, London, 1916-1917. 
No. 4 Edwards, F. W. Mosquitoes and their relation to dissase. 
19p. 1936 
No. 5 Cummings, B. F. The bed-bug. 20p,. 1917 
No. 6 Hurst, Stanley Species of Arachnida and Myriopoda )Scorpions, 
spiders, mites, ticks and centipedes ) injurious to man. 60p. 
1917 
No. 7 Kirkpatrick, H. The biology of waterworks. 58p. 1917. 
