106 Annals of the Carnegie Museum. 



Habitat. — Chapada, near Cuyaba, Matto Grosso, Brazil, collected 

 during April and May. Collection Carnegie Museum, Pittsburgh. 



In the character of the lobe formation of the lower carina of the middle 

 femora the present species and minor are quite similar, as are the lower 

 posterior angles of the pronotum, but the comparative smoothness and 

 the development of the pronotal process and wings are quite unlike. 



Sclerotettix tibialis sp. nov. 



This insect msiy be recognized at once from the other species of the 

 genus by the very prominent lateral pronotal carinse and the depressed 

 disk which gives to the dorsum of the pronotum the appearance of being 

 inclosed by a wall. The median carina of the pronotum back of its 

 anterior end is rather inconspicuous, while the pronotal process and wings 

 are slenderly extended greatly beyond the apex of the hind femora. 



Vertex about as wide as one of the eyes, depressed or sulcate anteriorly, 

 provided with a narrow but plainly ^■isible median carina, advanced but 

 little if at all ahead of the front edge of the eyes, the antero-lateral 

 carinae gently curved, the outer end abruptly bent backwards and ex- 

 tended to the middle of the inner margins of the eyes, — these when viewed 

 from in front appearing as minute horns; frontal costa inconspicuous 

 above, and but gently advanced beyond the front edge of the vertex, 

 quite prominently and roundly produced between the antennae; evenly 

 and moderately divergent, the sulcus profound. Lateral ocelli fairly 

 prominent, located between the middle of the anterior edge of the eyes. 

 Antennae attached just without a line drawn from between the lower 

 margin of the eyes, slender, of moderate length. Palpi in nowise con- 

 spicuous either by color or enlarged or depressed apical joints. Occiput 

 provided with two rugosities, the head inserted into the anterior edge of 

 the pronotum nearly to the eyes. Pronotum with the surface of sides 

 and disk decidedly rugose and carinated. strongly depressed back of the 

 shoulders. Lateral carinae widely interrupted by the transverse sulci, 

 which are profound, nearly parallel in front of these, continuous around the 

 humeral angles to the apex of the tegmina or a little beyond, arched over 

 the elytra and terminating beyond their apices; just within and a trifle 

 in advance of the apices of these arise the very prominent bordering 

 carinae of the lengthily drawn out process. Disk of the pronotum between 

 the shoulders gently convex and transversely rugose, back of this depressed 

 and furnished along the middle with three or four elongate nodules or 

 rugae representing the otherwise almost obliterated median carina; 



