BUFFALO SOCIETY OF NATURAL SCIENCES 117 



sistance to the beginner. Genus Aethalion has not yet been 

 reported from our territory although it occurs in Mexico and 

 the West Indies. 



KEY TO THE GENERA: 



Posterior process of the pronotum little if at all surpassing the 

 scutellum ; the anterior lobe without suprahumerals, 



1, Microcentrus Stal. 



Posterior process of the pronotum distinctly surpassing the scu- 

 tellum, 1. 



1. Pronotum with large conspicuous suprahumerals, 2. 

 Pronotum with small spine-like suprahumerals at least in 



the female; form broad oval, 4, Tylocentrus V. D. 



2. Suprahumerals long and slender, trete or triquetrous; pos- 



terior process long triangular, 3, Platycentrus Stal. 



-. Suprahumerals broad and flattened, little longer than broad, 

 and inclined outward and forward, 



2, Centra choides Fowl. 



Genus Tuberculocentrus of Goding (Can. Ent. xxvii, p. 275, 

 1895) is still unknown to me and there are no characters in his 

 description by which I can place it in a dichoto.mus table. It 

 seems to be closely related to Ccntrodontus and in that case 

 must be placed in subfamily Membracida. 



Genus Microcentrus Stal. 



Microcentrus caryae Fitch. 



Common and widely distributed throughout the eastern 

 United States and Canada. Canon Fowler in the Biologia 

 established genus PJiaulocentrus and includes in it Fitches 

 Uroxiphus caryce, apparently overlooking the fact that Stal had 

 already founded genus Microcentrus on this same species. 

 Fowler's genus seems to be a straight synonym of that of Stal. 



Genus Centruchoides Fowler. 



Centruchoides perdita A. & S. 



This insect was described by Amyot and Serville as a 



Lcdra and later by Goding as Centruchus Liebecki. Fowler in 



the Biologia founds genus Centruchoides for a closely allied 



species from Panama differing from this in having the posterior 



process of the pronotum longer, reaching almost to the apex of 



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