BY T. H. JOHNSTON AND M. J. BANCROFT. 187 
The squame is pale grey posteriorly shading to 
yellowish-grey anteriorly. The halteres are pale yellow 
and are covered by the squame. 
Legs. The legs are very dark brown, practically black, 
with pale foot cushions. 
Abdomen. The general colour viewed dorsally from 
behind is light yellowish-brown. When viewed micro- 
scopically the margins are seen to be silvery with prominent 
brown golden blotches laterally separating the silvery 
margins. The anterior part and mid-dorsal portion of 
the first segment are dark brown, the remainder of segment 
a paler brown. Succeeding segments are dark brown along 
the mid line but the colouration is not so pronounced in 
the last segment. The under surface of the abdomen is 
yellow with dark brown markings at the posterior end 
in the vicinity of the genital aperture. 
Female. 
The female differs from the male in the following 
particulars :—The eyes are separated by a space equal 
to about a-third of the width of the head, this inter-ocular 
region being occupied by the wide pale golden frontal 
margins and the wide dark brown frontal stripe. The 
black bands on the thorax are rather narrower than those 
of the male and consequently the general colouration is 
lighter. 
The first abdominal segment dorsally is practically 
black, while there is a median dark, more or less 
continuous, band on the remaining segments with dark 
brown blotches lying laterally. The general effect is shewn 
in fig. 1. Ventrally the colouration resembles that of the 
male. 
Breeding habits. The species is a larviparous one, 
one larva being deposited at each birth. The flies frequent 
isolated patches of fresh cow-dung for larviposition. They 
will also deposit larvae on horse-dung, but less frequently 
as the latter substance is usually drier, coarser and more 
friable, therefore forming a less suitable nidus for the 
developing larvae. The flies show considerable discrimina- 
tion in the choice of a suitable patch of cow-dung, selecting 
that which is of thinner consistency in preference to that _ 
