132 THE CA.NADIA.N ENTOMOLOGIST. 



Hemipterists, Dr. Bergroth's work is indispensable, because it brings down 

 to the end of the year 1907 the important Hemipterous family, Pentatomida?, 

 listed by Lethierry and Severin only up to 1S93. The treatment of the 

 synonymy, new names, and other more or less unsettled questions, is 

 tempered by the author's well-known aversion to what to him appears to 

 be unnecessary radicalism, and in consequence, for reasons satisfactory to 

 himself, he rejects much that to others might seem more or less reason- 

 able. The linear arrangement, as the preface states, is the same as that of 

 Lethierry and Severin for practical reasons, which are sufficiently obvious 

 in view of its character as a sequel to the Brussels catalogue. Another 

 point calling for special mention is that omissions in the former catalogue 

 are made good in this one. Among the omissions of Lethierry and Severin 

 may be cited the following American forms in Gerrid?e : Hydrometra 

 lineata, Say (now Martini, Kirk.), and Gerris canalicula'us, Say. 



For the convenience of those who may not be in a position to con- 

 sult this work, the changes, additions and omissions in our North 

 American forms, enumerated by Dr. Bergroth, are here briefly noted : 



Subfamily Thvreocorin^;. 



(sss Corimelanidie, L. & S.) 

 Tliyreocoris, Schrank. 



( = Corimelaena, White.) 

 Gillettei, Van Duz. 



obtusus, Uhler. 

 renormatus, Uhler. 

 Say 1, Van Duz. 



, albipennis, Say. 



Subfamily Scutellerin.k. 



( = Scut el ler idee, L. & S.) 

 Tetyra, Fabr. 

 robust a, Uhier. 



Fokkeria, Schouteden. 

 producta, Van Duz. ( Odontoscelis.) 

 - crassa, Schout. 



P/iimodera, Germar. 

 torrida, Reut. 



Euptychodcra, Bergroth (n. n.). 

 (|| Ptychodera, Reuter.) 

 corrugata, Van Duz. ( Phimodera.) 



Vanduzeeina, Schouteden. 

 Balli, Van Duz. (Odontoscelis.) 



