172 BIOLOGICAL SURVEY OF 



Pelenomus Thomson 



P. suLCicoLLis (Fahr.) (17828). Frequents smartweed (Poly- 

 gonium) from which it was swept. X. E. Harbor, July 26. 

 Not common. 



Khinoncus Schbnherr 



R. PYRRHOPUS Boh. (17842). Occurs on different species of 

 dock {Rumex). Bar Harbor, July 19-24. 



CoNOTRACHELus Schonherr 



C. NENUPHAR (Hbst.) (17851). Known as the Plum Curculio. 

 Breeds in plum, cherry, and the like. Bred from cherry 

 'black-knot' (Br.). Common. 



Cryptorhynchus Illiger 



C. LAPATHi (Linn.) (17974). The Willow Borer is an intro- 

 duced species first noted in U. S. 1882. Attacks willow, 

 poplar, and other ornamental trees. Of general distribu- 

 tion. The adults puncture the bark, gouging* the cambium 

 layer, while the young, which hatch late in the summer, 

 penetrate the cambium layer in which they hibernate, pupat- 

 ing in the older wood, and emerging the following spring. 

 Bred from willow^ as late as July 17. 



Ehyncolus Germar 



E. BRUNNEUs Mann. (18070). On cedar stump, June 27 (Br.). 



Sphenophorus Schonherr 



S. cosTiPENNis Horn (18114). Breeds in the roots of grass- 

 like plants. Wet meadow south of Penikese, July 14 

 Scarce. 



