IMTl ECONOMIC ZOOLOGY — ENTOMOLOGY. 665 



place of breeding, though as a matter of fact much study of this species on 

 the wing indicates that except when bred in enormous numbers over many 

 acres of sewage-charged water, the areas of great density are small and iso- 

 lated from each other, showing clearly that slight, if any, migration, has 

 taken place. 



Drainage and the elimination of mosquito breeding areas are considered at 

 some length under the headings of upland drainage, salt-marsh drainage, diking 

 and tide-gating, and pumping. 



The work with larvicides has seemed to indicate that fuel oil is the best 

 for general use. Tests of sulphuric acid indicate that it can not have any 

 great importance as a larvicide, while work with chlorin (bleaching powder) 

 seems to show that it can not have more than a limited use. Electrolytic 

 tests made of a machine consisting of a gasoline-engine-driven dynamo, con- 

 necting wires, and electrodes, in a meadow near Grasselli gave no evidence of 

 their destruction of mosquito larvae. In a test of niter cake it was found that 

 the pupse survived in a saturated solution. 



The domestic flies of New Jersey, C. H. Richardson {New Jersey Stas. Bui. 

 S07 (1917), pp. 5-28, figs. 18). — A summary of information on the more im- 

 portant domestic flies, based upon studies conducted for the past three yeara 

 at the station, the results of which have been previously noted (E. S. R., 

 32, pp. 60, 550; 34, p. 160; 36, p. 156). 



The species concerned are the house fly, flesh flies, blow flies and allied 

 species, the stable fly {Muscina stabulans) , the little house fly (Fannia canicu- 

 laris), the cluster fly (Pollenia rudis), etc. A summary of information on the 

 breeding places of domestic flies, their eradication, a key to the common 

 domestic flies of New Jersey, and a bibliography of 20 titles are included. 



Some fly poisons for outdoor and hospital use, A. O. Jackson and H. M. 

 Lefeoy {Bui. Ent. Research, 7 {1917), No. 4, pp. 327-335).— "The fluorids, 

 iodates, and salicylates are all excellent for indoor purposes and used at 1 per 

 cent in sugar solution are not in any way dangerous or offensive. Formalde- 

 hyde is so uncertain that its use is not indicated when any other safe liquid 

 can be employed ; the reasons for the variability of its action are now under 

 investigation. For hospital use, particularly, the very small quantity needed 

 makes even the salicylates possible as useful fly poisons ; an ounce of salicylate 

 to 5 pints of water would poison flies for some time throughout quite a large 

 hospital, and this amount could probably be spared. The fluorids are in use 

 as indoor fly poi.sons in the Imperial College, where they successfully destroy 

 flies that escape to the laboratories from the fly rooms." 



The apple maggot in British Columbia, R. C. Tbeheene {Canad. Ent., 49 

 {1917), No. 10, pp. 329, 330).— The author records the collection at Penticton, 

 B. C, on July 26, 1916, of two adult flies of the apple maggot. This is said to 

 be the first record of its collection in the Province of British Columbia and 

 is practically an original record for the Pacific coast of North America. 



The dipterous families Sepsidse and Piophilidje, A. L. Melander and A. 

 Spuleb {Washington Sta. Bui. US {1917), pp. 3-103, figs. 28).— In the present 

 bulletin the authors deal with the flies commonly combined as the family Sep- 

 sidae. These are of economic importance as they are principally scavengers, 

 feeding and breeding in filth, sewage, excrement, carrion, and other decomposing 

 vegetable or animal matter. A synopsis of the Sepsidse is first presented (pp. 

 6-53), followed by a synopsis of the Plophilldse. The authors recognize 51 

 species belonging to 18 genera, of which 19 are described as new. 



A catalogue of described species is Included. 



