19 



regularly and strongly convex, produced in front between the an- 

 tennae into a compressed lamina, bilaminate behind, cut transversely 

 so as to be bidentate in front; sockets of the antcnnce produced 

 interiorly into a high rounded lamina; eyes globose, prominent; man- 

 dibles very large, hollowed exteriorly; maxillary palpi slender, last 

 joint slightly swollen toward the apex and curved inwards, a little 

 longer than the preceding three joints taken together; labial palpi 

 stouter; first joint of antennas large and stout, fully as long as the 

 longitudinal diameter of the eye; second joint just half as thick, 

 scarcely longer than broad; remaining joints simple and similar. 

 Pronotum large, divided by two deep curved furrows into three 

 sections; the anterior two as broad as the head; the posterior much 

 broader and produced posteriorly into a high, rounded, nearly vertical 

 lamina, protecting the organs of flight; prosternum bimucronate. 

 Tegmina very short, coarse and stout, produced to a broad rounded 

 point, the $ with greatly developed, laterally prominent, coarse and 

 heavy stridulating organs; wings very short, nearly abortive; meso- and 

 metasternum distantly bimucronate. Legs very long, very stout and 

 very spiny; coxae heavy, the angles produced to short t^pines, all 

 the femora stout, the front with a double row of spines beneath, the 

 inner the stouter, with three very large, stout and finely pointed ones 

 on the inner surface near the apex ; the middle with a double row 

 beneath, the anterior the stouter; the posterior with a single row 

 beneath externally, growing larger toward the tip; fore and hind tibiae 

 with four, and middle femora with three rows of stout spines; fora- 

 mina of anterior tibiae linear, very small; abdomen large, a little com- 

 pressed . 



10. P. armata nov. sp. 



Head rugose, especially the front and sides, blackish brown ; labrum 

 and mandibles smooth; palpi and first joint of antenna? very dark 

 mahogany brown; rest of antennae black. Pronotum blackish brown, 

 very rugose, the posterior edge slightly raarginated. Tegmina dark 

 brown, not nearly so long as the pronotum, rugulose; wings abortive, 

 not half the length of the tegmina. Legs deep mahogany brown, the 

 tarsi and all the knees darker; the bases of all the tibiae externally 

 warty, mahogany brown; spines tipped minutely with black. Abdo- 

 men obscure, dark mahogany brown, beneath darker, the stigmata 

 yellowish, the appendages dull luteous. Length of basal joint of 

 antenuEe .14 in.; of apical joint of maxillary palpi .20 in. ; distance 

 from vertical spine to tip of labrum .7 in.; length of pronotum .7 in.; 

 of tegmina .58 in.; breadth of tegmina, exclusive of tympanum .27 



