142 



THE BIOLOGY OF INSECTS 



outlines of the cells that formed it, provided with an opening 

 or micropyle through which a sperm can make its way into 



Fig. 34. — Female Reproductive Organs of Warble-fly {Hypoderma 

 bovis), lateral view, the right ovary (ov. r) displaced ventralwards ; ov. /., 

 left ovary; od, paired oviducts, uniting to form median oviduct (od') 

 which passes into vagina (va) ; sp, spermathecae whence three ducts 

 pass to vagina ; ag, accessory glands ; op, ovipositor ; in, intestine ; r, 

 rectum with its glands (rg.). X 8. After Carpenter and Hewitt (Sci. 

 Proc. R. Dublin Soc. xiv, 19 14). 



the living egg-substance, and often with a lid through which 

 the young insect can emerge when the time of hatching 



arrives. 



