(112) 



STRUCTURE, DEVELOPMENT, AND BIONOMICS OF HOUSE-FLY. 353 



that at certain seasons of the year it is present in enormous 

 numbers. The method of disposal of the night soil is to bury 

 it in trenches about one foot or less in depth. From one 

 sixth of a cubic foot of soil taken from a trench at Meerut 

 and placed in a cage, 4042 flies were hatched. Lieut. Dwyer 

 collected 500 from one cage covering three square feet of a 

 trench at Mhow. Specimens in the British Museum collection 

 were obtained from the hospital kitchen s, and Smith found 

 them in a ward at Benares. 



They have also been recorded from the N.W. Provinces, 

 Kangra Valley (4500 feet), Dersa, and I have received speci- 

 mens from Aden. 



(2) Musca enteniata Bigot. 



This fly has a distribution somewhat similar to the last 

 species, and like it, has, a marked resemblance to M. domes- 

 tica, as Bigot's (1887) description indicates : 



" Front tres etroit, les yeux, toutefois, separes. Antennis et 

 palpes noirs ; face et joues blanches; thorax noir avec trois 

 larges bandes longitudinales grises ; flancs grisatres, ecussou 

 noir avec deux bandes semblables ; cuillerons et balanciers 

 d'un jaunatre tres pale; abdomen fauve, avec une bande 

 dorsale noir et quelques reflets blancs ; pieds noirs; ailes 

 hyalines; cinquieme nervure longitudinal (Rondin) coudee 

 suivant un angle legerement arrondi, ensuite un peu concave ; 

 deuxieme transversale (1'extreme) presque perpendiculaire, 

 legerement bisinueuse, soudee a la cinquieme longitudinale, a 

 egale distance du conde et de la premiere nervure transversale 

 (1'interne)." 



M. enteniata measures 4 to 5 mm. in length. The British 

 Museum collection contains specimens sent by Major F. Smith 

 from Benares, with these notes : "Bred from human ordure; 

 hospital ward fly; at an enteric stool; bred from cow-dung 

 fuel cakes." 1 have received, specimens from Suez and 

 Aden, and it is recorded as breeding in human excrement in 

 Khartoum (Balfour, 1908) and in stable refuse, as also M 



