57 



raised blackish tubercles: the outer face and ui)pei' edge 

 with indications of dusky bands. Hind tibiae, glauco- 

 cinereous, with Id sjDines in outer row. 



Length: of body, d' 30 mm, + 48 mm: ofj^ronotum, d 10-11 

 mm, ? 14-15 mm: of tegmina, d' -o-i^s mm, - oomm: of 

 hind femora, d' 17 mm, '^ !^4 mm. 



Specimens have been examined from Cordoba (F. Schulz, 

 H. StemiDelmann). In stature this insect is very similar to 

 T. /iisi(/iiis which follows, and there is a bare possibility that 

 it nvdy prove to be a dusky furm of that species. 



T. inf<i(/iiis Giglio-Tos. Santa Rosa, Salta (Giglio-Tos): 

 Cordoba (F. Schulz). 



7\ laenpe-s Stal. This seems to be the most abundant 

 species of the genus in the Republic, and is found on the 

 open camp, while all of the other species above referred to 

 frequent localities more or less grown ujj with woody 

 plants. Sjjecinjens were taken at Carcarana, Santa Fe (O. 

 Thomas). - 



Fig. 21. — Tropidonotus laevipes Stal. 



GENUS ALCAMENES, STAL. 



TABLE FOR SEPARATING TlIK SPECIES. 



A. Pronotum tectiforni; the anterior ami iniddlc sulci obsolete above: 

 the posterior lobe longer than anterior. Posterior tibi:e with TJ i;{ 

 spines in outer row. " brovicollis Stal. 



AA. Pronotum plain above, the median carina nioileratcly elevated: all 

 three of the sulci plain al)ove: the i)osterior lobe shorter than an- 

 terior. Posterior tibia' with 8-10 s])ines in outer row. 



olaraziaiius Pict. et Sauss. 



A. brevicollis Stal. Corrientes, Argentina (Stal). 

 .4. clarazlanKs Pict. et Sauss. La Republiciue Argentine 

 (Pict. et Sauss.). 



