6 
Three articles have been published as bulletins of the 
Laboratory: one by Professor Weed on a plant louse 
species, one by Professor Gillette on new gall flies in the 
Laboratory collections, and one by myself on insect 
bacteria. We have now in press in this series, and nearly 
ready for distribution, a full descriptive monograph of 
the reptiles and amphibians of the State (173 pages and 
seven plates), by Professor Garman, and a similiarly ex- 
haustive account of the Illinois species of one of the 
families of true bugs (Membracida), by Dr. F. W. Goding. 
Besides these regular publications we have prepared 
and printed, in connection with the distribution of col- 
lections to be referred to later, two lists, one of dupli- 
cate insects in the collection of the Laboratory (nine- 
teen pages), and one a list of economic species for public 
schools (thirteen pages). 
The following is a list of papers by the Laboratory 
force, published during the two years, the work for 
which has been done at the Laboratory. 
Forbes, 8. A.—Synopsis of Recent Work with Arsenical Insecti- 
cides. (Trans. Ill. State Hort. Soc., 1889, p. 310.) 
On a Bacterial Insect Disease. (North American Practitioner, 
1891, p. 401; Am. Monthly Micr. Journ., 1891, p. 246.) — 
Bacteria Normal to Digestive Organs of Hemiptera. (Bull. 
Tll. State Lab. Nat. Hist., iv, page 1.) 
On Some Lake Superior Entomostraca. (Rep. U. 8. Fish 
Comm., 1887, p. 701.) 
Preliminary Report upon the Invertebrate Animals inhabit- 
ing Lakes Geneva and Mendota, Wisconsin, with an Ac- 
count of the Fish Epidemic in Lake Mendota in 1884. 
(Bull. U. S. Fish Comm., viii, p. 473.) 
A Summary History of the Corn-Root Aphis. (Insect Life, 
iii, p. 233.) 
On the Life History of the White Grubs. (Insect Life jiii., 
p. 239.) 
Report of Progress in Economic Entomology. (Proc. 4th Ann. 
Convention Ass’n Am. Agr. Colleges and Exper. Stations ; 
in Misc. Bull. No. 3, U. S. Dept. Agr., Office Exper. Sta- 
tions, p. 29.) 
The Hessian Fly. (Bull. Univ. Agr. Exper. Station, No. 
2, p. 377.) 
