262 



BEVERLY WAUGH KUNKEL 



The pupae were then removed from the sand and placed in 

 Petri dishes with loose-fitting covers. After seven days all the 

 living pupae had emerged. There seemed to be greater mortality 

 among the thjToid fed flies than among the muscle-fed, for out 

 of 35 muscle pupae there emerged 33 adults, while from the 40 

 thyroid pupae only 23 emerged. 



In egg mass No. 24 of L. caesar, the thjToid-fed larvae produced 

 pupae having an average length of .315 inch, and the muscle-fed 

 larvae produced pupae having a length of .314 inch. In egg mass 

 No. 26 of L. caesar thyroid feeding was followed by a slightly 

 decreased length of pupae in comparison with those fed on muscle. 

 The respective average lengths were .293 and .297 inch (table 5). 



TABLE 5 



Showing the effect on the length of the pupae of Lucilia caesar of feeding the larvae on 

 thyroid. The first line indicates the distribution of the thyroid-fed pupae according 

 to length, the second line indicates that of the muscle-fed 



1 







310-314 



Thyroid. 

 Muscle. . 



Length in .OOl's inch. 



4 



Egg mass No. 16 of L, caesar shows by far the greatest differ- 

 ence in length between the thyroid- and muscle-fed pupae. The 

 distribution of the pupae is shown in table 6. The average 

 length of the muscle-fed pupae was .350 inch, and that of the 

 thyroid-fed was .308 inch. 



TABLE 6 



Showing the effect on the length of the pupae of Lucilia caesar of feeding the 

 larvae on thyroid. The first line indicates the distribution according to length 

 of the thyroid-fed pupae, the second indicates that of the muscle-fed 



