REPORT OF THE ENTOMOLOGIST 117 



were placed in one jar and those of the scotch pine (Pinus sycTCStris) 

 In another. From the twigs of jack pine on July 14 there emerged 

 eleven moths and one ichneumon; on July 15, four moths and one chalcid 

 parasite; on July 16, eight moths and five chalcid parasites; on July 17, 

 two ichneumons and one chalcid parasite; on July 21, one moth and one 

 chalcid parasite. From the cage of scotch pine twigs on July 14, two 

 moths emerged; on July 16 another moth and on July 17 another moth; 

 no parasites were reared from these twigs. 



The eleven which emerged July 14 from the jack pines were placed 

 in a breeding jar to observe the oviposition. On July 17 the needles and 

 the walls of the breeding jar were abundantly provided with eggs which 

 had been laid by the moths. These eggs were very small, flat and yel- 

 lowish in color and were laid indisciriminately over the needles of the 

 pine. The moths bred from these twigs have been identified by compe- 

 tent authorities as Evetria fmstrsina. The manner of introduction of 

 the insect into the isolated pine grove is difficult to account for; they- 

 may have been carried over by the winds from the Pine Ridge to the 

 northwest, but it is more probable that they were brought in on young 

 trees, and multiplied and spread from these introduced pines. Pine 

 stock has been imported from New York, Minjiesota, Michigan and 

 Wisconsin in small numbers, according to the supervisor, and it is 

 possible the insect was brought in with one of these importations. 



Parasitism of the White-Marked Tussock Moth in 1908. 



During early July of 1908 it was evident that the first brood of the 

 tussock moth was undergoing a very heavy parasitic infestation, since 

 the number of cocoons brought into the laboratory yielded specimens 

 of various species of both hymenopterous and dipterous parasites of this 

 species. In order to gain some idea of the exact extent of this parasitism 

 the following experiments were planned and carried out by Mr. C. H. 

 Gable and R. W. Dawson, both then in the employ of the State Ento- 

 mologist. The following statement of the result of the experiments has 

 been prepared by Mr. Gable. 



The only dipterous parasite reared was the Tachinid, Frontina 

 frenchii, a primary parasite of the tussock moth. There were also reared 

 three species of Pimpla, all primary on the tussock stock, but the pre- 

 dominating species was P. inquisitoriella D. T.; in fact in the following 

 experiments all the specimens reared were of this species except one 

 specimen each of P. conciuisitor Say, and P. anuulipes Say. A fifth species 

 of primary parasite was Chalcis ovata. The only secondary parasite 

 reared was Dibrachys boucheanus which attacked both the Pimpla and 

 Frontina. As many as thirty-two specimens of the hyperparasite were 

 reared from a' single cocoon. 



EXPERIMENT NO. 1. 



On July 9, 1908, 2.50 cocoons of H. leucostigma were collected in Lin- 

 coln. These cocoons containing the following: 



