32 BULLETIN 250, U. S. DEPABTMENT OF AGEICULTURE. 



Hemlock and Witch-hazel. 



The larvae fed freely in all stages on the witch-hazel, but none at all on 

 the hemlock in the first stage; feeding increased gradually, and in the three 

 last stages hemlock foliage was eaten freely. 



The larvae were of good size and produced both male and female moths. 



Chestnut and Eed Maple. 



Xo feeding was apparent on the chestnut during the first and second stages, 

 and it was moderate in the remaining stages. Feeding on maple was mod- 

 erate in all stages. The larvae were below average size, grew slowly, and only 

 males developed. 



In the field similar results have been observed. 



Chestnut and Black Oak. 



The larvae fed freely on both food plants, except in the first stage, when 

 they attacked oak exclusively. They grew steadily, attained large size, and 

 adults were reared. 



Field observations indicate that these species are freely eaten when growing 

 in the same locality. 



Chestnut and Chestnut Oak. 



The oak was fed upon freely in all stages, but the chestnut was eaten mod- 

 erately in all stages except the first. Growth was slow and the larvae died 

 before pupating. 



Chestnut and "White Pine. 



Larvae started in the first stage died in the third stage or earlier. Those 

 that molted once were very small and puny, while those started in the third 

 stage produced a few male moths. Both plants were eaten quite freely in the 

 last stages. 



Similar results have been noted in the field. 



American Linden and Red Oak. 



The larvae fed lightly on the linden in the first few stages, and, although the 

 feeding increased slightly in the later stages, it was never excessive. Oak was 

 preferred and was eaten freely in all stages. The larvae developed rapidly, 

 were of average size, and several moths were reared. 



In the field this combination furnishes very favorable food for the gipsy 

 moth. 



Red Maple and Witch-hazel. 



Tbe larvae fed freely on both food plants in the first two stages, but from the 

 end of second stage to the close of the experiment a preference was shown for 

 witch-hazel. 



The larvae grew rather slowly and but few adults were obtained. 



White Pine and Witch-hazkl. 



The larvae fed moderately on witch-hazel in all stages, hot none on pine 

 (hiring tbe first two stages. Later the feeding increased steadily to the end of 

 the experiment'. 



The larvae were of small size and but few adults were reared. 



