21 



('. BorelUi Giglio-Tos. This insect was described as 

 Prosarthria BorelUl by Giglio-Tos (Boll. Miis. Torino, Vol. 

 IX, No. 184, p. 4, 1894.) It probably occurs in the region 

 embraced in the territory of Formosa. 



C. Calzana Giglio-Tos. Caiza, in Bolivian Chaco, adjoining 

 the northern iDortion of Argentina. (Giglio-Tos.) 



C. caUiuLKs Jiuviw. Northern Argentina. (Burmeister. ) 

 C. oWi-^sa Giglio-Tos. Provin'::;e of Jujuy. (Giglio-Tos.) 

 C. w«r/;;« Giglio-Tos. Province of Jujuy. (Giglio-Tos.) 

 (J. gigantea G\g\\o-^os. Province of Jujuy. (Giglio-Tos.) 

 ('. teretmscula Brunner. Resistencia, Chaco. (Gigiio-Tos.) 

 ('. lancea Burm. Entre Rios (Burmeister); Cordoba. 

 (Collection P. Schulz and H. Stempelmann. ) 



('. luieata Brunn. Mendoza in La Plata (Dohrn's Collec- 

 tion. ) 



SUB-FAMILY TRYXALINAE. 



The insects belonging to this sub-family are much more 

 numerous than are those of any of the preceding sub-fami- 

 lies ; and, in some instances, become sufficiently numerous 

 to warrant their being classed as destructive. In Argentina 

 we have so far found species which belong to the genera 

 named in the following table for their separation. Several 

 of these genera are herewith described for the first time, 

 while a few of the species also are made known to science in 

 this paper, they not having been recorded or described by 

 any former writers. 



TABLE FOR SEPARATING THE GENERA. 



A. Foveohi? of vertex below or absent. Faee usually very oblique, 

 b. Antenna' with the joints depressed, more or less ensiforui. 

 e. Wings of male more or less broadly fenestrate, 

 d. Sides of the fastigium strongly rounded, the apex not acumi- 

 nate. Tegmina acuminate or decidedly obliciuely truncate. 

 Posterior femora with the apical angles horizontally ])ro- 

 duced, acuminate, 

 e. Head conical: face moderately obliipie. Foveohc of the 

 vertex indistinct, triagonal. 

 f. Vertex longer than the eyes. Tegmina of male broader 

 than thelength of the pronotum. Winu's of male vcrv 

 broadly fenestrate. HYALOPTEHVX Charp. 



