ENTOMOLOGY. 145 



noticed, probably owing to dronglit, but after a short time the disease 

 appeared following- showers, and killed practically all of the bugs. 

 There were sent to 1,941 farmers in 4C counties of the State 14,877 

 boxes of infected chinch bugs. In addition other distributions of 

 chinch bugs were made. A number of the distributions of fungus 

 failed of the best elfect on account of dry weather preventing the 

 growth of the fungus, but in many cases the disease spread rapidly 

 and checked the ravages of the bugs, though not always until after the 

 rains had occurred. 



A map is given showing the distribution of chinch bugs in the State 

 in 1887, 1894, and 1895, as well as the location of pine and deciduous 

 forest areas and prairies. Eemarksaremadeon some fraudulent insec- 

 ticides, particularly one containing equal parts of ginger and salt. 



Notes are given on the fungus Tsaria tomicii, found attacking bark 

 beetles of the genus Tomicus, and bacterial diseases of the 2-strip8d 

 locust {Melanoplus bivittatus), of a cabbage butterfly {Picris protoMoe), 

 and of the tent caterpillar. It was found impossible to introduce into 

 the State the grasshopper disease, which was raging violently among 

 grasshoppers iu Colorado, but the cabbage- worm disease proved of easy 

 propagation and killed all the caterpillars in the fields where it was 

 introduced. Tlie tent caterpillars disappeared before pure cultures 

 made from the single diseased individual were ready for inoculation, 

 but as with the other diseases attempts toward infecting will be made 

 this year. 



Notes are given on a grasshopper invasion of the State in the neigh- 

 borhood of Duluth, where these insects in increasing numbers have 

 been damaging vegetation for the past 2 or 3 years. Formerly the 

 injurious grasshoppers were the Rocky Mountain locust {MeJanoplus 

 spretns), but the species concerned in this invasion were the lesser 

 migratory locust (M. atlanh) and the pellucid locust {Cammda pellu- 

 cida). Illustrated descriptions are given of these 2 species, and 

 their life history is outlined. Early fall plowing of all the land in 

 which eggs have been deposited is recommended as the best preventive 

 method, and for a remedy against an invasion of adults the use of 

 hopperdozers has been found most efficient. Hopperdozers were used 

 over a space of from 36 to 40 square miles, where the grasshoppers were 

 most abundant, with great success. Poisoned baits of bran mash and 

 Paris green also killed large numbers. Illustrated notes are given on 

 several parasitic enemies of grasshoppers, especially the red mite 

 {Tromhidium locustarum), tachina flies, flesh fly {Sarcophaga carnaria), 

 bee fly {Hystcechus oreas), and blister beetles {EpiGauta spp.). 



The history, life history, and remedial treatment for the potato beetle 

 {Dorypliora decemlineata) are given. There are 3 annual broods iu 

 Minnesota, of which the last hibernates in the adult state. Paris green, 

 applied either dry or preferably mixed with water (1 lb. to 150 gal.) 

 has proved the best and a most eflicient remedy. Brief notes are also 



