105 



cattle. They should be usetl at the same temperature as the lime- 

 sulphur dip, and flowers of sulphur may be added to them at the 

 rate of 16 lb. to every 100 gals, of diluted dip. 



If a petroleum dip is used the vat should be filled with water to 

 within 12 or 18 inches of the dip line ; to this crude oil is added until 

 it reaches the dip line ; these dips are used cold and the cattle should 

 be protected from the sun for several days after they have been applied. 



Dyar (H. G.) & Knab (F.). New Species of Tropical American 

 Mosquitoes (Diptera, Culieidae). — Inseciitor Inscitiae Menstruus, 

 Washington, D.C., vii, no. 1-3, January-March 1919, pp. 1-9. 



The species dealt with are : — Wyeomyia jyrolejndis, sp. n., and 

 W. fauna, sp. n., from the Panama Canal Zone ; Subetliinus moerbista, 

 sp. n., from British Guiana ; Lestiocampa viomlesi, sp. n., from 

 Guatemala ; Culex bonneae, sp. n., bred from larvae found in water 

 barrels, puddles and tree-holes in Dutch Guiana ; C. {Microcnlex) 

 chri/selatus, sp. n., bred from larvae in epiphytic Bromeliaceae in 

 Dutch Guiana ; C. (Melanoconion) ocossu, sp. n. , fromBritish Guiana and 

 possibly identical with C. {M.) aikenii {Gnophodeomyia i}iornata,T]ieo.), 

 the larvae being abundant all the year round in freshwater canals 

 in company with those of Aedomyia squamipennis, and the adult, 

 which is a blood-sucker, sometimes visiting houses at night ; and 

 Aedes thaxteri, sp. n., bred from larvae in bracts of Heliconia from 

 Grenada. 



Dyar (H, G.). A Note on Lesticocampa, and a New Species (Diptera, 

 Culieidae). — Insecutor Inscitiae Menstruus, Washington, B.C., 

 vii, no. 1-3, January-March 1919, pp. 9-11. 



Lesticocampa trichopus, sp. n., is described from Brazil. 



Dyar (H. G.). Westward Extension of the Canadian Mosquito Fauna 

 (Diptera, Culieidae).- — Insecutor Inscitiae Menstruus, Washington, 

 B.C., vii, no. 1-3, January-March 1919, pp. 11-39. 



Typically Canadian mosquitos are :~Aedes punctor, Kirby, the 

 eastern limits of which are known, but the westward extension of which 

 in the Rocky Mountains has not yet been determined ; A. lazarensis, 

 Felt & Young, an aberrant form of which occurs in the Rocky 

 Mountains, almost to the exclusion of the normal form ; A. pioniqjs, 

 sp. n., the large, dark-coloured larvae of which have been found in 

 small mossy pools in a spruce swamp ; A. diantaeus, H., D. & K., 

 described from New Hampshire, the larvae occurring in mossy pools 

 in a spruce swamp ; A. decticus, H. , D. & K. , a species extending slightly 

 beyond the Canadian region, having been taken in New York and 

 Minnesota ; A. prodotes, Dyar, the Rocky Mountain form of the 

 preceding species, the larva being unknown ; A. intrudens, sp. n., 

 the only species of the genus of which the adults persistently enter 

 houses, and which ranges throughout and slightly beyond the Canadian 

 fauna, having been recorded from Massachusetts ; A. excrucians, Wlk.. 

 a species occurring throughout the Canadian area and extending 



