40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



brown. Experiments were performed in which a white-eyed mutant 

 was combined in parabiotic fusion with a normal animal. It was found 

 that although such pairs lived for several weeks and had established 

 perfect blood connections, the eye color of the mutant individual was 

 not affected by the normal partner. The white Periplaneta eye is ap- 

 parently unable to utilize tryptophane-derived dififusible pigment pre- 

 cursors which circulate in the blood of normal Periplaneta. 



8. In the discussion, the results of these studies are compared and 

 related to findings of other investigations. These efforts reveal that 

 the biosynthesis of the brown eye pigment in Musca, Phormia, and 

 Periplaneta is in general similar to that found in other insects. 



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1937a. Development of eye colors in Drosophila: Fat bodies and Malpighian 



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 1937b. Development of eye colors in Drosophila: Fat bodies and Malpighian 



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 Becker, E. 



1938. Die Gen-Wirkstoff-Systeme der Augenausfiirbung bei Insekten. Na- 



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BODEN STEIN, D. 



1950. The postembryonic development of Drosophila. In Biol, of Dro- 

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 Hanser, G. 



1948. t)ber die Histogenese der Augenpigmentgranula bei verschicdenen 

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