123 



of the cysts was very satisfactory. Practically all larvae were killed by 

 a wash consisting of 1 lb. derris, 4 oz. soap, and 1 U.S. gal. water 

 applied with a brush to the backs of the infested cattle. 



Wallace (F. N.) & others. Report of the Division of Entomology. — 



3rd Ann. Rept. Indiana Dept. Conservation, 1920-21, Indiana- 

 polis, 1922, pp. 37-57. [Received 10th April 1922.] 



Remedial measures for houses infested with fleas include mopping 

 the floors with a 5 per cent, solution of a cresol preparation. Basements 

 should be sprayed with cresol solution, and a vacuum cleaner run over 

 all the floors, as this picks up eggs, larvae and adults. If the house can 

 be closed for 24 hours, naphthaline flakes, at the rate of 5 lb. to a room, 

 should be scattered over the floors. Dogs may be washed in a 3 per 

 cent, solution (4 tablespoonfuls to 1 U.S. gal. water) of cresol. 

 Cats should be dusted with pyrethrum powder.. 



The most practical remedy for bed-bugs is gasoline. Seams and 

 buttons on mattresses should be carefully treated, and all cracks and 

 crevices of the bedstead flooded. Cracks in the floor, etc. should be 

 flooded with gasohne at intervals of a week, and after two or three 

 weeks this should give complete control. 



CooLEY (R. A.). Fourth Biennial Report of the Montana State Board of 

 Entomology, 1%1Q-2Q.— Helena, January 1921, pp. 1-17. 

 [Received 11th April 1922.] 



During 1919 and 1920 efforts have been devoted almost exclusively 

 to the control of Dermacentor venustns. Banks (spotted fever tick) 

 in Western Montana. The procedure now in force is the destruction 

 of the ground squirrel, which harbours the immature stages of the tick, 

 and the prevention of adult ticks from feeding on domestic animals. 

 Tables are given showing the prevalence of spotted fever in Montana. 



Further investigations are now needed to ascertain the origin in 

 nature or ultimate source of this disease. Under laboratory conditions, 

 besides the guinea-pig and the Belgian hare, other animals susceptible 

 to the disease are Citellus columhianus (ground squirrel), Callospcrmo- 

 philns lateralis cinerascens (rock or side-striped squirrel), Eutamias 

 liiteiventris (chipmunk), Neotoma cinerea (mountain or wood rat), 

 Puioriits arizonensis (weasel), Lepiis bairdi (snowshoe rabbit), Sylvilagns 

 nuttalU (cottontail rabbit), and the prairie dog of Eastern Montana. 

 It is of the utmost importance to ascertain the responsibihty of these 

 and other mammals as reservoirs of the disease. 



Reference is made to the discovery of the causal agent of this disease, 

 Dermacentroxenns rickettsi, Wolbach [R.A.E., B, x, 27]. 



Parker (R R). Report of Tick Control Operations in the Bitter Root 

 Valley during the Seasons of 1919 and 1920.— i//i Bienn. Rept. 

 Montana State Bd. Ent., 1919-20, Helena, January 1921, pp. 

 18-44. [Received 11th April 1922.] 



The control of Dermacentor venustns (Rocky Mountain spotted 

 fever tick) is difficult owing to the comphcated life-cycle and host- 

 relationship of the tick, as well as the climatic and economic conditions 

 in which it occurs. From 2,000-7,000 eggs are deposited by each 

 female under rocks and litter during the spring and early summer. 

 The larvae feed only on the blood of rodents from one to several 

 days ; they then drop off and pass the remainder of that year and 

 the following winter resting, appearing as nymphs the next spring. 



