164 
and there in spring of 1889, but by the end of summer chinch- 
bugs had practically all disappeared, crops of infested region be¬ 
ing the best known there for many years. Speaks of possible 
economic use of the spontaneous diseases of chinch-bugs. 
Forbes, S. A.—On a Bacterial Disease of the Larger Corn-Root 
Worm ( Diabrotica 12-punctata, Oliv.). (Seventeenth Rep. 
State Ent. Ill., pp. xi and 71.) 
Mentions bacterial disease which turns the larva red. Particu¬ 
lars of symptoms given, and of progressive attack and post-mortem 
appearances. Successful cultures reported, with description of 
characters of growth on liquid and solid media. Colors media 
first orange-red and then blood-red. 
Forbes, S. A.—On the Common White Grubs (Lachnosterna and 
Cyclocephala). (Seventeenth Rep. State Ent. Ill., p. 45.) 
Reports death of great numbers of white grubs in field and 
laboratory, apparently from bacterial disease. 
Forbes, S. A.—Notes on the Diseases of the Chinch-bug. (Sev¬ 
enteenth Rep. State Ent. Ill., p. 74.) 
Comprehensive article, containing summary of previous work on 
this subject by the writer, with reference to work of Lugger, 
Snow, and Webster. Doubtfully successful cultures of Micrococ¬ 
cus [Bacillus j insectorum , Burr ill. Various culture and infection 
experiments with Sporotrichum . globuliferum. Description of the 
fungus, with list of species infected with it. Analytical list and 
summary of articles on the subject published in 1882-91. 
Forbes, S. A.—On a Bacterial Insect Disease. (N. Am. Practi¬ 
tioner, 1891, p. 401; Am. Monthly Micr. Journ., 1891, p. 
246.) 
Describes supposed disease of chinch-bug characterized by pres¬ 
ence of bacteria in coeca of alimentary canal. This canal described 
at length, together with affection of coecal cells in which Micrococ¬ 
cus insectorum is fouud. Apparent effects on the chinch-bug. 
Description of methods of isolation and of culture experiments. 
Garman, H.— [Diseases of Pieris rapce believed to be non-trans- 
ferable to other species.] (Insect Life, v. 3, Nos. 7 and 
8, April, 1891, p. 333.) 
States that in a field at Lexington, Ky., where Pieris rapce and 
P. protodice were about equally common, although seventy-five per 
cent, of rapce were affected, not a case of a diseased protodice 
was noted. He says, “with the dead larvae of P. rapce abundant 
in the cabbage, and their fluids constantly spread over the leaves 
by dews and rains, a better test, on a larger scale, of the com¬ 
municability of this disease could scarcely have been devised.” 
Laboratory experiments with it to the same effect. Thinks that 
experiments for the destruction of the boll-worm should not be 
made with bacteria of disease of P. rapce . Suggests as more 
promising, diseases which affect the forest tent caterpillar or the 
striped cutworm. 
