A496 ©. GORDON HEWITT. 
I. IntTRODUCTION. 
In the present paper, which is the second of the series of 
three, the breeding habits and development of M. domestica 
and the anatomy of the mature larva will be described. Its 
publication has been delayed owing to the fact that I wished 
to make the observations on the breeding habits and life- 
history as complete as possible. With the recent appearance 
of two short papers by Newstead (1907) and Griffith (1908), 
many of whose observations, to which I shall refer later, are 
confirmatory of my own results, we now have a more com- 
plete account of the breeding habits of this insect. 
The anatomy of the larva has been described in a similar 
manner to that of the fly (1907). I have refrained in this 
paper from giving a detailed account of the embryology and 
the development of the imaginal discs, as these are separate 
and specialised studies, and would have resulted in too great 
a digression from the plan originally adopted. 
The methods used were the same as those previously 
employed. ‘lhe anatomical structures were studied with the 
aid of the Zeiss binocular dissecting microscope, and the 
drawings were made from the dissections. ‘The latter were 
confirmed by means of serial sections. ‘Too much stress 
cannot be laid on the importance of employing both these 
methods where possible, as it frequently happens that mistakes 
are made in investigating by one method only, which would 
be unrectified were not the other employed in confirmation. 
I wish to thank the Council of the Manchester University 
for providing me with a suitable experimental greenhouse 
and apparatus for the experimental portion of this investiga- 
tion; the absence of such facilities would have been a severe 
handicap. The outdoor observations on the breeding habits 
have been made during the last few years in. Manchester and 
the surrounding district. 
The third paper, which will conclude this study of M. 
domestica, will deal with the bionomics of the fly, its para- 
