STRAIN AND INDIVIDUAL IDIOSYNCRASIES 29 



F2 Hyb. zebra larva, white 



cocoon X hyb. zebra larva, white cocoon; 



produced 112 zebra larvse spinning yy white and 19 pale 

 salmon cocoons, and 51 white larvse spinning 13 white and 

 4 pale salmon cocoons. 



F2 Hyb. zebra larva, sal- 

 mon cocoon X hyb. zebra larva, salmon cocoon ; 

 produced 85 zebra larvse spinning 14 white and 38 salmon 

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

 21 salmon cocoons. 



Fj c? Hyb. zebra larva, 



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



produced 99 zebra larvse spinning 34 white and 28 pale 

 salmon to salmon cocoons, and 37 white larvse spinning 14 

 white and 19 salmon cocoons. 



Fj $ Hyb. zebra larva, ^ ^ hyb. zebra larva, yellow co- 

 white cocoon coon; 



produced 227 zebra larvse spinning 63 white and 68 pale to 

 yellow salmon cocoons, and 47 white larvse spinning 20 

 white and 2^ 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. 



Fi J* Ital. Sal. X $ Bagdad ; produced 50% zebra and 50% white 

 larvse, and all white cocoons. 



Fg Hyb. zebra larva, white cocoon X hyb. zebra larva, white 

 cocoon; produced 43 zebra and 11 white larvse and 38 

 white and 9 salmon to golden yellow cocoons. 

 F2 ^ Hyb. white larva, white cocoon X $ hyb. zebra larva, white 

 cocoon; produced 61 zebra and 59 white larvse, and 6y 

 white and 20 salmon cocoons. 

 Fi S Bagdad X $ Ital. Sal. ; produced all zebra larvse and all 

 white cocoons. 



F2 Hyb. X hyb. ; produced 68 zebra and 42 white larvse and 44 



white and 19 salmon to golden cocoons. 

 F2 Hyb. X hyb.; produced 114 zebra and 26 white larvse and 

 36 white and 9 salmon cocoons. 

 Fj ^ Bagdad X 5 Ital. Sal. ; produced 58 zebra and 73 white larvse, 

 and all white cocoons. 



