or larval ohauibiMs aro [>iivsont thov aio probably the result of two or 

 more soparato aots of ovipot;ition. 



The ovaries of two fomalos wore dissootoil out ai\d the ejigs counted 

 in order to determine the number of e^ijs a female tly is capable of 

 producing. From the ovaries of a female which had laid no eggs, 

 108 apparently mature ova were obtained, as well as a considerable 

 number of immature ones from the ovarian tubules : the ovaries and 

 oviduct of another female yielded 105 ova ; this tiy had, however, laid 

 a few eggs. \\ e may safely say that a female of this species is capable 

 of laving at least 100 eggs, and if the immature ova ripen as the season 

 advances, then probably considerably more. 



Descripdona of ora, larrac. amJ pxjHtt'. 



The ovum of T. .^ohtidalis is elongate and usually crescent shaped, 

 with its widest diameter across the centre ; the amount of curvature 

 varies, however, examples are met with at times that are almost straight ; 

 from the central area the egg tapers towards each end, but more abruptly 

 towards the posterior end which is pointed, than to the anterior or 

 cephalic end which is rounded, and terminated by the prominent 

 micropyle. Bezzi (1913), who discusses the metamorphosis and bio- 

 nomics of the Trypaneids in general, states that the eggs are " rounded 

 at the two ends " ; the egg of this species is therefore exceptional 

 in this respect. 



The ova have a glistening white appearance, and when present 

 are readily observed in the tlower-heads ; the 'shell or chorion is very 

 thin and quite smooth, and exhibits no sculpturing or pattern on the 

 surface. 



In size the ova vary considerably : a number of ova laid by one 

 female varied in size from 0"87 \ O-lj mm. to 1-0 1 \ 0-17 mm. ; ova 

 taken from the same tly measured about 0-9 \ 0-liI mm. The largest 

 ovum observed measured l-o \ 0-15 mm. ; the average size is about 

 1-1-02 \ 0-15 mm. 



Just before deposition the fertilised ovum completely tills the space 

 within the chorion, but shortly after ovipositiou the embryo commences 

 to diminish in length ; in three ova measured one hour after oviposition 

 there was a shrinkage of 0-18 mm., O-'J mm. and 0-3 mm. respectively, 

 and within twenty-four hours of oviposition the embryo contracts to 

 about two-thirds of its former length. (Fig. 7.) A space thus appears 

 at each end between the embrvo and the chorion. 



