228 



gave excellent results, and it was found that calcium arsenate may 

 be safely used with lime-sulphur if 3 to 4 lb. of hydrated lime are 

 added to every 40 gals, of liquid. The success of remedial measures 

 depends greatly on weather conditions. It is suggested that dusting 

 should be done in fine weather after 7 p.m. and before 8 a.m. 



Armstrong (W. W.). Dusting 80 Acres of Peaches. — Canad. Hortic, 

 Peterhoro, Ont., xliv, no. 1-2, January-February 1921, p. 5. 



Excellent results were obtained against peach curculio [Conoira- 

 chelus nenuphar'^] and other pests by dusting with 80 per cent, sulphur, 

 10 per cent, lead arsenate and 10 per cent. lime. The first application 

 was made in June ; 16 hours were required to cover 80 acres. A second 

 application was made about eight days later. The ultimate cost of 

 dusting as compared with spraying is about the same. 



LocHHEAD (W.). A Quarter Century of Lime-sulphur. — Canad. 

 Hortic, Peterhoro, Ont., xliv, no. 1-2, January-February 1921, 

 p. 6. 



The evolution of the use of lime-sulphur against San Jose scale 

 [ Aspidiotus perniciosus] is reviewed. It is a most valuable insecticide 

 and fungicide, but for use against scale-insects and codling moth 

 [Cydia pornonella] the addition of lead arsenate or calcium arsenate 

 is necessary. Nicotine extract should also be added if Aphids are 

 numerous. 



Sanders (G. E.). Dusting to Date in Nova Scotia. — Canad. Hortic, 

 Peterhoro, Ont., xliv, no. 1-2, January-February 1921, p. 7. 



Copper-arsenic dust, made up of 10 lb. dehydrated copper sulphate, 

 5 lb. calcium arsenate and 85 lb. hydrated lime, has proved to be cheaper 

 than and quite as efficient as a liquid spray in the control of fungous 

 diseases, but no dust mixture has yet proved to have the value of a 

 liquid spray against Aphids, red bug [Heterocordylus], green apple bug 

 [Lygus], etc. 



MacGillivray (A. D.). The Saw-flies (Tenthredinoidea) collected 

 by the Canadian Arctic Expedition, 1913-18. — Kept. Canad. 

 Arctic Exped.. 1913-18, Ottaiva, iii, pt. G., 3rd November 1919, 

 pp. 3g-19g. [Received 8th March 1921.] 



Of the 18 species recorded, 17 are described as new, including : — 

 Euura ahortiva from galls on leaves of Salix reticulata, adults emerging 

 in July ; E. arctica on S. reticulata ; Pontania atrata and P. lorata on 

 creeping willow (5. arctica) ; P. delicatula on 5. reticulata ; P. quadri- 

 fasciata, cocoons of which were found in old Cerambycid burrows in 

 the bark of white spruce, and P. trifasciata on S. richardsoni. 



Brues (C. T.). The Parasitic Hymenoptera collected by the Canadian 

 Arctic Expedition, 1913-18.— 7\V/>/. Canad. Arctic Expcd., 1913-18, 

 Ottai&a, iii, pt. G., 3rd November 1919, pp. 21g-24g. [Received 

 8th March 1921.] 



An Ichneumonid, Diodes modestus, sp. n., reared from galls from 

 Salix, probably produced by a saw-fly, is described. 



