3 
common Thrips or strawberry “ midget,” the injuries and life 
history of the little-known corn root worm, the spring and 
summer history of the Hessian fly, and the life histories of the 
common white grubs and wireworms. Other subjects of in- 
terest studied are injuries to fruit trees by the European bark 
beetle, the damage to wheat, oats, and other grains by the grain 
Aphis, the life history of the swamp bill bug, the species and 
life histories of a considerable number of gall gnats, and the 
breeding, identification, and description of common aquatic 
larve from temporary pools in spring. Especially important 
progress has been made in our knowledge of the history and 
habits of some of the commonest and most destructive insects 
of the farm, including the white grubs, the Hessian fly, and 
the corn root louse. 
The entomological collection has been greatly enlarged, 
especially in Diptera, and a large number of determinations in 
all orders have been made. The named collection is now con- 
tained in 160 double boxes, and numbers about 5,000 species, 
each being represented, as a rule, by four selected specimens. 
The pinned and determined duplicate insects on hand — largely 
in process of distribution to public schools —amount to 42,600 
specimens. The alcoholic insects, including large numbers of 
larve, are contained in about 10,200 bottles and vials. 
Seven hundred and forty-four copies of the zvdlogical vol- 
ume—the first on the ornithology of the state—have been 
issued up to the present time (Dec. 31, 1890), 732 of them 
gratuitously, 656 in [Illinois and 76 outside of the state, and 12 
have been sold at cost ($3.50 a volume). There remain of the 
edition printed 256 copies, 200 of which we have reserved for 
future use. 
There have been printed since my last statement two of 
my reports as State Entomologist, that for the years 1885 and 
1886 —long delayed in the hands of the printer — having 
finally been issued in 1889, and the report for 1887 and 1888, 
in 1890. Each of these reports contains seven articles; the 
first 103 pages and the second 226 pages. 
In the Bulletin of the Laboratory six articles have been 
issued in the last two years, one on the animals of the Missis- 
- sippi bottoms, by Prof. H. Garman; two by myself, describing 
