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496 0. GOEDON HEWITT. 



I. INTRODUCTION. 



IN the present paper, which is the second of the series of 

 three, the breeding habits and development of M. doinestica 

 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. The 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. 

 domes tic a, will deal with the bionomics of the fly, its para- 



