STRAIN AND INDIVIDUAL IDIOSYNCRASIES 29 



F 2 Hyb. zebra larva, white 



cocoon X hyb. zebra larva, white cocoon; 



produced 112 zebra larvae spinning 77 white and 19 pale 

 salmon cocoons, and 51 white larvae spinning 13 white and 

 4 pale salmon cocoons. 

 F 2 Hyb. zebra larva, sal- 

 mon cocoon X hyb. zebra larva, salmon cocoon ; 

 produced 85 zebra larvae spinning 14 white and 38 salmon 

 to yellow cocoons, and 26 white larvae spinning 3 white and 

 21 salmon cocoons. 

 F 2 <$ Hyb. zebra larva, 



yellow cocoon X $ hyb. zebra larva, white cocoon ; 



produced 99 zebra larvae spinning 34 white and 28 pale 

 salmon to salmon cocoons, and 37 white larvae spinning 14 

 white and 19 salmon cocoons. 



F 2 5 Hyb. zebra larva, ,,. $ hyb. zebra larva, yellow co- 

 white cocoon coon; 



produced 227 zebra larvae spinning 63 white and 68 pale to 

 yellow salmon cocoons, and 47 white larvae spinning 20 

 white and 27 pale to yellow salmon cocoons. 

 A few examples from other Bagdad X Italian Sal. series may be 

 given to emphasize the actuality of individual idiosyncrasies in these 

 crossings. 



F! $ Ital. Sal. X 5 Bagdad ; produced 50% zebra and 50% white 

 larvae, and all white cocoons. 



F 2 Hyb. zebra larva, white cocoon X hyb. zebra larva, white 

 cocoon; produced 43 zebra and n white larvae and 38 

 white and 9 salmon to golden yellow cocoons. 

 F 2 $ Hyb. white larva, white cocoon X J hyb. zebra larva, white 

 cocoon; produced 61 zebra and 59 white larvae, and 67 

 white and 20 salmon cocoons. 



FI c? Bagdad X J Ital. Sal.; produced all zebra larvae and all 

 white cocoons. 



F 2 Hyb. X hyb. ; produced 68 zebra and 42 white larvae and 44 



white and 19 salmon to golden cocoons. 

 F 2 Hyb. X hyb.; produced 114 zebra and 26 white larvae and 



36 white and 9 salmon cocoons. 



F i c? Bagdad X ? Ital. Sal. ; produced 58 zebra and 73 white larvae, 

 and all white cocoons. 



