77 



little obtuse in female. Tegmina extending a triHe beyond 

 the ti]) of hind femora in both sexes ; the latter very heavy 

 at base. Prosternal spine short, a little transverse, the 

 apex blinit. Pronotam above with a large triangular black 

 spot immediately back of last transverse sulcus. In soma 

 specimens the portion back of this light brown or ferrugin- 

 ous, and in still others dirty white. Occasionally this white 

 band etxends also upon the back edge of the lateral sides of 

 7Dronotum so as to give the insect the appearance of having 

 a light collar or light colored band immediately in front of 

 base of wings. Tegmina irregularly mottled throughout 

 with dusky dots. Hind femora marked above with three 

 dusky bands: the knees also somewhat dusky: several of 

 the abdomional segments with their sides more or less black : 

 last ventral segment of ' the male with the edges dusky. 

 Cerci moderately slender, elongate, and bowed inward on 

 aT^ical half. 



Length: of body, d' K) mm, ? 20-23 mm: of pronotum, 

 cJ' 8.75 mm, ? 5-5.5 mm; of tegmina, d 18 mm, ? 15-17 

 mm : of hind femora, c? 10 mm, ? 12 mm. 



A common insect on the dryer portions of the camp in 

 southern Santa Fe and eastern Cordoba, where it occurs 

 during the latter part of winter and earlv spring. (O. 

 Thomas, A. Kurriger). 



I). Beir/ii Stal. Resistencia, Chaco (Giglio-Tos) : Corrientes, 

 Buenos "Aires and Parana (C. Stal); Cordoba (F. Schulz, 

 H, Stempelmann) ; Carcarana and Rosario de Santa Fe (O. 

 Thomas, A. Kurriger). 



Bichrop/Ks rlftctus n. sp. 



! General color bright greenish yellow : the occiput, lateral 

 edges of i^ronotum in advance of postreior transverse sulcus, 

 along with dorsal edges and discal field of tegmina brown : 

 the three basal segments of abdomen at sides, and knees of 

 hind femora both internally and etxernally, black: pos- 

 terior tibiae deep greenish blue; hind femora with the 

 lower sulcus yellow, the inner face near basal half l)right 



