Feb. is, 1921 Leconte's Sawfly, an Enemy of Young Pines 757 



Counties in Wisconsin, at Kanawha Station, W. Va., and in the experi- 

 mental nursery at Bast Falls Church, Va. ; red pine (P. resinosa) , which 

 was commonly attacked in Vilas and Oneida Counties, Wis., and has 

 been recorded by a correspondent as being attacked at Hyde Park, 

 Dutchess County, N. Y., but which in experiments for oviposition by 

 adults and as food for larvae conducted in the nursery at East Falls 

 Church, Va., has always led to failures; and scrub pine (P. virginiana) , 

 which is the native host of this insect through northern Virginia, Mary- 

 land, and Pennsylvania. 



The secondary or possible hosts can not be ranked as complete hosts 

 capable of supporting the insect through all its various stages or as en- 

 tirely acceptable to females for cviposition. They have been deter- 

 mined by observation in the field and nursery, from correspondence and 

 literature, and through experimentation. They are white pine (Pinus 

 strobus) in Wisconsin and at Reading, Pa.; Scotch pine (P. sylvestris) 

 at Reading and Austin, Pa.; loblolly pine (P. taeda) Annandale, near 

 Falls Church, Va., and Clinton, La.; shore pine (P. contorta) at Kana- 

 wha Station, W. Va.; silver pine (P. monticola) in the nursery at the 

 Eastern Field Station; mugho pine (P. mughus), West Chester, Pa.; P. 

 eldarica, Yarrow, Md., chosen in the field and nursery; western yellow 

 pine (P. ponderosa) , used in experimentation (confining adults in a cage 

 upon the young tree); and longleaf pine (P. palustris), 1 Austrian pien 

 (P. austriaca), 2 and American larch (Larix americana)? mentioned in 

 literature and correspondence. 



PARASITES 



Neodiprion lecontei is subject to attacks by both parasitic insects and 

 a wilt. Four species of hymenopterous and four species of dipterous 

 adults have been reared from the cocoons of this species, but neither egg 

 parasites nor parasites which emerged from uncocooned larvae have 

 been obtained. The hymenopterous parasites were determined by 

 S. A. Rohwer as Exenterus diprioni Rohwer, Lagorotis diprioni Roh- 

 wer, L. virginiana Rohwer, and Perilampus hyalinus Say. Of these 

 parasites L. diprioni Rohwer is much the most abundant species, and 

 Perilampus hyalinus Say is probably a hyperparasite. The dipterous 

 parasites were determined by C. T. Greene as Phorocera claripennis 

 Macquart, Adomonita demylus Walker, Neopales maera Van der Wulp, 

 and Spathimeitenis spinigera Townsend. 



The wilt of the larvae was probably a bacterial disease and was found 

 in Wisconsin by S. A. Rohwer, in 191 2. The larvae attacked were readily 

 distinguished by their lack of vigor and their white tracheal system, 



1 Larvae sent in by a correspondent from Pinehurst, N. C, with the following note: "Eating the pine 

 needle of the longleaf pine in this vicinity." 



2 RlLEY, C V. NINTH ANNUAL REPORT ON THE NOXIOUS, BENEFICIAL, AND OTHER INSECTS OF THE 



state OF Missouri, p. 32-33. Jefferson City, Mo. 1877. 



3 "When forced to, defoliate and girdle," in letter from W. D. Barnard, Boulder Junction, Wis. 



