208 BIOLOGICAL BUBVE'S OF 



PlTTOPHTHOBUS Bichhoff 



P. ramipeeda Sw. (18421). Beared from white pine twigs, 

 Aug. 19. 



P. pulicabius Zimni. (18423). Boring in diseased red pine 

 lips ( Br.), Aug. 29; Reared from white pine twigs, Aug. 19, 

 1919 (M. W. Blackmail). 



I*, cabiniceps Lee. (184."57). From blister nisi canker (Br.), 

 May 28. 



P. patchi Blackmail (20668). Taken on Pitch Pine (San- 

 ford). 



P. biovalis Blackm. (20669). Reared from white pine twigs, 

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



P. mtjndtjs Blkni. (21641). Tremont Bog, May 25. 



PlTYOGENES Bedel 



P. hopkixsi Sw. (184").")). Found iii 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. Station F.mS; in IT.S.N.M. 



IPS De Geer (Tomicus Latreillet 



I. pixi (Say) (1847o). The Pine Bark Beetle also found in 

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

 Aug. 8 (Sanford). Common. 



Orthotomicus Ferrari 



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

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



Dkyocof.tis Kichhoff 



D. ameeicanus Hopk. (18.")38). Occurs in fir and spruce. 



Long Pond, July 16. 

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



