120 



Haecker (V.). Zur Fliegenplage in Wohnungen und Lazaretten. 

 [The Fly Pest in Dwellings and Hospitals.] — Zeitschr. f. angeiv. 

 Entom., Berlin, iii, no. 2, 1916, pp. 207-209. [Received 19th 

 April 1920.] 



Observations made by the author show that flies may be kept out 

 of dwellings and hospitals even when conditions are such that all 

 breeding places outside the buildings cannot be entirely destroyed. 

 The habit of flies in general of congregating on sunny walls of dwellings 

 is taken into consideration and by shutting all windows just before 

 the sun reached them and keeping them shut until they were again 

 in the shade the author was able to exclude these pests entirely from 

 the interior of his house and the same method has since proved 

 successful under hospital conditions. 



EscHERiCH (K.). Blausaure als Entlausungsmittel. [Hydrocyanic 



Acid as a remedial Measure against Lice.] — Zeitschr. f. angew. 



Entom., Berlin, iii. no. 3, 1916, pp. 426-428, 1 fig. [Received 



19th April 1920.] 



The advantages of hydrocyanic acid gas fumigation over other 



insecticides for the destruction of lice and other insect pests are 



emphasised, and the method of utilisation is described. 



Martini (E.). Zur Kenntnis des Verhaltens der Lause gegenuber 



Warme. [A Contribution to the Knowledge of the Behaviour 



of Lice with Reference to Heat.] — Zeitschr. f. angew. Entom.. 



Berlin, iv, no. 1, 1918, pp. 34-70, 10 figs. [Received 19th April 



1920.] 



In extensive experiments here described, it was found that if Uce 



were placed on an unequally warmed surface the individuals wandered 



about aimlessly until accidently a point of suitable temperature was 



reached. Radiant heat has a distinct attraction for these insects 



and they will follow the rays. Between 27-30° C. (80-85°F.) is 



apparently the temperature preferred by them, as they migrate from 



a cooler or warmer environment towards this centre. 



Hase (A.), ijber die Bekampfung der Bettwanzen {Cimex lectularius, 

 L.) mittel Cyanwasserstoff (Blausaure). [Control of Bed-bugs 

 by means of Hvdrocyanic Acid]. — Zeitschr. f. angew. Entom., 

 Berlin, iv, no. 2, '^1918, pp. 297-309, 4 figs. [Received 19th April 

 1920.] 

 Successful experiments with hydrocyanic acid fumigation against 



Cimsx lectularius, L., in inhabited houses are described in detail. 



Bresslau (E.) & Glaser (F.). Die Sommerbekampfung der Stech- 

 mticken. [Summer Control of Mosquitos.] — Zeitschr. f. angew. 

 Entom., Berlin, iv, no. 2, 1918, pp. 290-296, 2 figs. 



. Die Winterbekampfung der Stechmucken. [Winter Control 



of Mosquitos].— Z6w/, pp. 327-331. [Received 19th April 1920.] 

 Mosquito control is divided for convenience into measures for 

 summer and winter. The summer measures, which aim at the des- 

 truction of mosquito larvae, includes the removal of useless collections 



