THE CANADIAN ENTOMOLOGIST. 65 



thing has been attempted for Chermes, to make it a Coccid genus, but, as 

 I believe, invalidly. 



With regard to Cicadella, I am unable now to refer again to 

 Latreille's work of i Si 7. In a later edition, the " Cicadae ranatrae " are 

 given as a synonym, but not exclusively, as is evident from the context ; 

 the genus is divided into several subgenera, and the last one is called 

 Tettigojita, being said to contain the Cicadellas proper. If, therefore, 

 Tetigonia (or Tettigonia) is the typical subgenus of Cicadella, then 

 Cicadella is a strict synonym of the earlier Tetigonia. Of course, if this 

 information is not in the 1817 edition, then one of the " Ranatrae " of 

 Linneus, 1767, must be taken, and I must abandon my present contention 

 (as regards Cicadella). 



Fam. Asiracidse. 



Delphax picti/rons, Stal, 1864, Stett. E. Z., XXV, 50, Mexico. — ^This 

 has been omitted by Fowler in the Biologia. 1 do not know it. 



BOOK NOTICE. 



Genera Insectorum Coleoptera Adephaga, Fam. CARABiDiE, Subfam. 

 CiciNDELiNiE. Von Dr. VValther Horn, Wytsman, Bruxelles, 1908. 



"One hundred and fifty years have flown since the publication of 

 Ivinne's tenth edition of the 'Systema Naturse,' in which the Swedish 

 naturalist cites five species of the genus Cicindela. He calls them 

 ^Tigrides veloces,' and the name 'Tiger Beetles' has persisted until to-day, 

 when about forty genera, with twelve hundred species and a few hundred 

 subspecies, are known." 



These, freely translated, are the introductory words of Dr. Horn's 

 paper, and give some idea of the development of the knowledge of this 

 group. Seldom do we meet with an entomological treatise in which the 

 author displays such familiarity with the literature of his subject, together 

 with knowledge of the specimens themselves, in cabinet and in nature. 

 The amount of information conveyed is astonishing, and the work is really 

 far more than its title indicates. It is arranged in two sections, a "General 

 Part" devoted to a discussion of the problems encountered in a study of 

 the group, and a "Special Part," containing tribal and generic synopses 

 with systematic list of all the species, accompanied by bibliographic, 

 synonymic and geographic references. In the space available it is possible 

 only to note the general plan of the work and to cite some points of interest 

 to American entomologists. 



