174 BIOLOGICAL SURVEY OF 



PiTYOPHTHORUS Eichhoff 



p. RAMiPERDA Sw. (18421). Bred from white pine twigs, Aug. 



19. 

 P. PATCHi Blackmail (20668). Taken on Pitch Pine (Sanford). 

 P. puLiCARius (Zimm.) (18423). Bred from white pine twigs, 



Aug. 19, 1919 (M. W. Blackman). 

 P. BiovALis Blackm. (20669). Bred from white pine twigs, 



Aug. 19, 1919 (M. W. Blackman). 



PiTYOGENES Bedel 



p. HOPKiNsi Sw. (18455). Found in white pine, but not com- 

 mon. Bar Harbor, June 7. Brower bred it from Populus 

 tremuloides July 4 and from blister rust white pine Aug. 10. 



Ips De Geer (Tomious Latreille) 



I. piNi (Say) (18475). The Pine Bark Beetle also found in 

 hemlock. Bred from pine log Corfield, July 21 ; Lake Wood, 

 Aug. 8 (Sanford). Common. 



Obthotomicus Ferrari 



0. CAELATUS (Eich.). Found in both pine and spruce. Lake 

 Wood, Aug. 8, '21 (Sanford). 



Dryocoetus Eichhoff 



D. AMERiCANus Hopk. (18538). Occurs in fir and spruce. Long 



Pond, July 16. 

 D. BETULAE Hopk. (18540). Feeds on birch and beech. 



