22 BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 



Scotch Pine (Pinus sylvestris L.). 



Tray experiments started with first-stage larvae on this species failed to 

 produce second-stage larva?. Those started with second-stage produced sixth- 

 stage larva?, when many died from disease. The feeding was slow until the new 

 growth expanded, after which they fed freely. 



Mr. Proctor has noted practically the same thing in the field. 



Gray Pine {Pinus banlcsianti Lamb.). 



First-stage larva? started on this foliage in the trays failed to go beyond the 

 second stage. Trays started with larva? in the third stage produced both male 

 and female pupa?. Feeding was fairly free on the foliage after the first stage. 



No field observations were made on this pine. 



Western White Pine (Pinus monticola Dougl.). 



First-stage larva? supplied with this foliage failed to reach the second stage, 

 but second-stage larva? fed and a good number of male moths were produced. 

 The feeding after the first stage was quite free, and this food seems to be more 

 favored than the white pine. 



No field observations were made on this pine. 



White Pine (Pinus strobus L.). 



Tray experiments show that first-stage larva? can not feed to any extent upon 

 the foliage and do not pass into the second stage. Mr. Collins succeeded in 

 rearing adults from second-stage larva? at Worcester on white pine. 



In the field, where the pine is clear or in mixture with hemlock, feeding did 

 not begin before the third or fourth stages. When the pine is mixed with gray 

 birch or with any of the oaks, first and second stage larva? were observed feed- 

 ing to a slight extent. 



The larva begins feeding near the base of the needle and eats through until 

 the larger part falls to the ground. Other needles are attacked in the same 

 way, so that a tree may be stripped in a very short time. (PI. VI.) 



Beach Plum (Primus maritima Wang.). 



Beach plum is not a particularly favored food plant. First-stage larva? died 

 before completing the third stage, and those started in the third stage produced 

 male moths only. They fed but little, grew very slowly, and the pupa? were of 

 small size. 



Mr. Kennedy observed larva? in the first, second, and third stages feeding 

 upon this foliage to a slight extent in the field. 



American Aspen (Populus tremuloides Michx.). 



Although this species can not be placed in the class with oak, apple, willow, 

 etc., in favorability, yet it will support the larva? from time of hatching to 

 pupation, and will produce fairly vigorous pupse. The male moths <l<n-eloped 

 from experiments when larvse were started in the first stage. 



Feeding was observed in the field by all statics, and in some rases complete 

 defoliation resulted. 



