friE CANAt)IAN ENTOMOLOGIST. 191 



Typhlocybidce. 

 Dicraneura communis, Gill. — July 14. 

 Kmpoasca atrolabes, Gill. — July 8. 

 Kuipoasca mali, LeB.— July 2,^. Several. 

 Emp jasca unicolor, Gill. — July 8. Two specimens. 

 Empoasca viridescens, Walsh. — July 31. 

 Eupteryx flavoscuta, Gill., and var. — July 15. Several. 

 Typhlocyba tricincta. Fitch. — July 2. 

 Typhlocyba bifasciata, G. and B. — July 21. 

 Typhlocyba sp., near tenerrima, H. S. — Sept. 2. 

 Typhlocyba comes, Say. — Sept. 2. Common on wild grape. 

 Typhlocyba comes, Say, var. S-notata, Walsh. — Sept. i. ^Vild grape. 

 Typhlocyba comes. Say, var. vitifex, Fh. — July 8. 

 Typhlocyba comes, Say, var. vitis, Harr. — July 31. 

 Typhlocyba comes. Say, var. ziczac, Walsh. — July 30. Wild grape. 

 Typhlocyba vulnerata. Fitch. — July 31 and Sept. i. 

 Typhlocyba querci, Fh. — July 2. Oak. 

 Typhlocyba sp., near querci, Fitch. — July 15. 

 Typhlocyba rosse, Linn. — July 7. 



Psyllidce. 

 Psylla carpini, Fh. — Aug. 2. 



PRACTICAL AND POPULAR ENTOMOLOGY.— No. 21. 

 The ScoLYTiD.t or Engraver-beetles.* 



BY J. W. SVV.\INE, ITHACA, N. Y. 



Scolytidre have been described frnni almost every portion of this 

 continent from Mexico to Alaska, and will ])roba!)ly be found wherever 

 their food-plants occur. Many species are described from the West 

 Indies, and a very large number from Central and South America, and 

 from Europe. ALany are known from japan, Australia, Ceylon, South 

 .\frica ;uid elsewhere. A few species seem. almost world-wide in distribu- 

 tion ; others are known only from small regions. A number of injurious 

 species, e. .j,--., Scolytus mgulosus and Xyleborus dispar, have been 

 introduced into America from Europe. Over 1,400 species of Scolytids 

 are already described. 



The North American members of the family Scolytidre are usually 

 somewhat elongate and cylindrical in form, and brown or black in colour. 



*Contributioii from llie Eiitoinoloa;ii'al Laborators of the Cornell University. 

 June, iyo7 



