167 



Hearle (E.). An Aerial Survey o! Mosquito Breeding Places. — Agric. 



Gaz. Canada, Ottaica, ix, no. 3, May-June 1922, pp. 191-195, 



2 figs. 

 Owing to the use of aeroplanes during 1921 by the Canadian Air 

 Board, in co-operation with the Entomological Branch, in the Lower 

 Eraser Valley of British Columbia, it has been possible to obtain a 

 series of photographs, accompanied by careful notes, covering every 

 breeding-place of mosquitos and giving sufficient data for the prepara- 

 tion of a map indicating those areas upon the reclamation of which 

 their control depends. It is estimated that there are in the valley 

 some 28,000 acres of temporary flood-water breeding areas suitable 

 for the production of vast numbers of Aedes aldrichi and A. vexans. 



Macfie (J. W. S.). Accra Laboratory Report for the Year 1920. — 



Govt. Gold Coast, Kept. Med. Dept. 1920, Accra, 1921, pp. 39-64. 



Examinations of mosquito larvae showed that, as usual, Ae'des 

 argentens, Poir., was the commonest species, being found in 91*4 per 

 cent, of the samples. Anopheles costalis, Theo., the only known malaria 

 carrier in the list, was encountered only once. 



During a few months, commencing at the end of November 1919, of 

 607 mosquitos collected in houses and offices in Accra, A. costalis 

 represented 14 per cent, and Aedes argentens 15'8. Culexfatigans, Wied., 

 predominated (63'9). The other species collected were C. thalassius, 

 Theo., C. decens, Theo., C. tritaeniorhynchns , Giles, Culiciomyia nehulosa, 

 Theo., Mansonioidcs africanns, Theo., Banksinella lineatopennis, Ludl., 

 Aedes (Ochlerotatns) irritans, Theo., A. (0.) minutus, Theo., and 

 A. (0.) punctothoracis, Theo. 



Banksinella lineatopennis, Ctdex per/idiosns, Edw., and C. rima, 

 Theo., were added to the mosquitos indigenous to Accra ; and 

 C. perfitscns, Edw., or a variety of that species, was also collected, so 

 that the list now includes 62 species or well-recognised varieties. 

 A new Aedes of the subgenus Stegomyia, A. (5.) dendrophilus, Edw., 

 was reared from material taken from rot holes in trees. 



With regard to malarial infections in Anophelines, 432 specimens 

 were collected indoors from May 1919 to April 1920, of which 428 

 were A. costalis, 3 A. pharoensis, and 1 A. funestus. Of the 231 

 specimens dissected, only one, a specimen of A. costalis, was found to 

 have sporozoites in its salivary glands. This result is surprising 

 in view of the well-known prevalence of malaria in Accra — malignant 

 tertian is the common type, and the stage of the parasite infective to 

 mosquitos, the crescents, is very common. It would appear that the 

 position of Accra is an unfavourable one for the spread of the malaria 

 parasite, and that a slight change in the conditions might turn the 

 scale definitely against it. 



A Psychodid, Telmatoscopns meridional-is, Eat., is an inoffensive 

 midge that is nevertheless, in a sense, a sanitary danger signal, inasmuch 

 as it breeds in most filthy collections of water, and thrives particularly 

 well on faecal matter. 



Cleland (J. B.). Insects and their Relationship to Injury and Disease 

 in Man in Australia — No. II. — Australasian Med. Congress, 

 Trans. Eleventh Session held in Brisbane, Queensland, 21st -28th 

 August 1920, pp. 258-265. 



The following data are additional to those in a paper contributed 

 to the Congress at Sydney in 1911, 



