324 PROCEEDINGS OF THE ACADEMY OF [May, 



bases.^^ The brownish phase varies in tone from pale dull wine color 

 (vinaceous) and clay color to burnt umber, the caudal femora in the 

 extreme condition with more or less apparent transverse dark bars 

 on the dorsal face, and in the same pronounced type the caudal 

 tibise are of the general tone. The brownish phase and the normal 

 greenish phase are apparently connected by intermediate types, 

 some individuals being of the green phase with the dorsum of the 

 pronotum and the tegmina weakly vinaceous, while other specimens, 

 which otherwise would be referred to the brownish phase, have 

 yellowish the underlying color, the femora unhanded and the tibise 

 of the glaucous of the green phase. The speckled phase also shades 

 into both of the other forms and is characterized by a mottling of 

 bistre, olive-green, or bay over the underlying bright gamboge to 

 lemon-yellow of the pronotum and head of those specimens approach- 

 ing the green phase and over burnt umber in the single (Jujuy) 

 specimen approaching (or rather in) the brownish phase. These 

 fine mottlings are either general on the dorsum or grouped in 

 two irregular longitudinal bars, which are postocular in their po- 

 sition, the interocular portion of the head also being much suffused. 

 In the extreme condition of this phase the femora are moderately 

 banded dorsad, the tibise being of the color which the general tone of 

 the individual more nearly approaches. These phases are not 

 geographic, as the Mendoza series has all three, but apparently a 

 certain type is more numerous in one locality than in others. All of 

 the Potrerillos material is either in or very closely approaching the 

 speckled phase, while, aside from several brownish individuals, all 

 of the Chacras de Coria representatives are in or very near the green 

 phase. 



There is considerable size variation, but this appears to be indi- 

 vidual and not geographic. 



The range of the present species is known to extend from the 

 Bolivian Chaco (Caiza and San Francisco, cotypic individuals being 

 before us) and Jujuy, south to the Provinces of Santa Fe (Carcarana), 

 Cordoba, San Luis (Alto Pencosa), and Mendoza {vide supra). 



PACHYOSSA n. gen. 



Intermediate in position between Parossa Bruner (Ossa Giglio-Tos) 

 and Ommexecha Serville, sharing certain characters of each, but far 



^* Superficially, this might suggest to some an approach to P. bimaculata, which 

 is in part characterized by having large yellowish maculations in the same regions, 

 but in the present form the yellow is never as decided or as sharply outlined,, 

 while excellent structural characters readily differentiate the two species. 



