2 INSECTS AFFECTING STORED PRODUCTS. 
that the subject possessed no interest. In refutation of these state- 
ments it may be said that at the time they were made, in 1893, very 
little was positively known of the life histories of even our commonest 
granary insects and that the species themselves were not well known. 
Since that time many new forms have been added to our list, and 
many new facts concerning their habits, injuries, distribution, etc., 
have developed — all of sufficient interest to consume a considerable 
portion of the writer's time and energy now and perhaps for some 
years to come. 
Inspection of the exhibits of cereal and other seeds at the World's 
Fair in Chicago, just mentioned, was the means by which many species,, 
hitherto unknown or of little understood habits and distribution, 
became known, and notes made on their occurrence there and in 
other localities have added much to our knowledge concerning them. 
Visits during subsequent years, made by the writer and by agents and 
assistants, to flour mills, bakeries, and warehouses, and to feed and 
other stores have added much more to our already acquired informa- 
tion, and the correspondence of the bureau has contributed other 
facts. 
The list which follows was prepared originally for the writer's per- 
sonal use in the work of investigating insects of this class, but as the 
comprehensive work contemplated, on insects that affect stored 
cereals, will not be completed for some time, it has been thought 
advisable for the benefit of others working along similar lines to pub- 
lish it now, in connection with and as an introduction to other papers, 
which will follow: 
INSECTS AFFECTING STORED CEREALS AND CEREAL PRODUCTS. 
CUCUJID.E. 
1. Silvanus surinamensis L Chittenden: Farmers' Bui. 45, U. S. Dept. 
Silvanus frumentarius Fab. Agr., p. 16, 1897. 
Saw-toothed grain beetle. Infests all cereals, dried fruits, etc. 
A general feeder. 
2. Silvanus bicornis Er Chittenden: Bui. 8, n. s., Div. Ent., U. S. 
Dept. Agr., pp. 10-11, 1897. 
Found in wheat granaries and dried figs. 
3. Silvanus mercator Fauv Bui. 8, n. s., Div. Ent. U. S. Dept. Agr. r 
. Merchant grain beetle. p. 12, 1897. 
Habits similar to S. surinamensis. 
4. Cathartus gemellatus Duv Farmers' Bui. 45, IT. S. Dept. Agr., p. 17,. 
Silvanus cassix auct. 1897. 
Square-necked grain beetle. Infests corn and wheat. 
5. Cathartus advena Waltl Farmers' Bui. 45, U. S. Dept. Agr., p. 17,. 
Silvanus advena Waltl. 1897. 
Foreign grain beetle. Attacks grain, meal, and flour; does not 
develop to any extent in material kept 
dry and clean. 
