STRUCTURE, DEVELOPMENT, AND P.IONOMICS OE HOUSE-FLY. 353 
that at certain seasons of the year it is pi’esent 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 kitchens, and Smith found 
them in a ward at Benares. 
They have also been recorded from tlie 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, aud like it, has a marked resemblance to M. domes- 
tica, as Bigot’s (1887) description indicates : 
“ Front tres etroit, les yeux, toutefois, sepnres. 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 jaunfitre 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 pen concave; 
deuxieine transversale (I’extreme) presque perpeudiculaire, 
legerement bisinueuse, soudee a la cinquieme longitudinale, a 
egale distance du coude et de la premiere nervure transversale 
(I’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 
