47 



GENUS OSSA, GIGLIO-TOS. 



TABLE FOR SEPARATING THE SPECIES. 



A. Body covered with long white hair. Tegmiiia above with au orange 

 spot at base. Eyes globose. Posterior femora moderately heavy. 



bimaculata Giglio-Tos. 



AA. Body subglabrous. Tegmiua above without a l)asal spot. Eyes 



ovoid. Posterior femora somewhat slender, vii'idis Giglio-Tos. 



. (). biiiKtriildfd Gi.s^lio-Tos. Resistencia, Cliaco (Giglio-Tos). 

 0. viridis Giglio-Tos. San Lorenzo, Jujuy (Gigiio-Tos) : 

 Cordoba (P. Schulz) ; Carcarana, Santa Fe (O. Thomas). 

 This last named species is exceedingly common in some lo- 

 calities, where it seems to prefer certain food-plants to others. 

 One of these is a Nycotlana or closely realted form with yel- 

 lowish blossoms. It might, therefore transfer its attention to 

 the tobacco plant where this is cultivated. 



GENUS OMMEXECHA, SERVILLE. 



TABLE FOR SEPARATING THE SPEGIES. 



A. Tegmina not reaching the apex of abdomen. 



1). General color green; tegmina shorter. Hind femora externally 

 smooth. vireiis Serv. 



bl). General color dull brown; tegmina longer. Hind femora exter- 

 nally hirsute. Servillei Blanch. 

 AA. Tegmina reaching beyond the tip of abdomen. The genicular lobes 

 of hind femora two-spined. iiiacropteruni Blanch. 



0. vire)if< Serv. Recorded from Buenos Aires (Serville). 

 Perhaps only a freshly molted specimen of the next species. 



(>. Servillei Blanch. Resistencia, Chaco (Gigiio-Tos) ; 

 Corrientes (Bolivar). This insect occurs in arid localities 

 and according to Blanchard is especially fond of tobacco as a 

 food-plant. 



0. macroitteruin JM?i\ich. San Pablo, Tucuman; San Lor- 

 enzo, Jujuy (Giglio-Tos). This insect was redescribed as i). 

 Jiruniieri by Bolivar according to Dr. Karsch. (Ent. 

 Nachricht., XIV, p. 329, 1888); and the (). iii<(vroi>terum 

 Blanch, referred to the new genus Spathaliu)n (Mong. de los 

 Pirgomorfinos, p. 34). 



