300 NEOTROPICAL PSELAPHIDAE 



vaulted posteriorly with a pair of very small, nude vertexal foveae on a line 

 through center of eyes, nearer each other than either from an eye, and on the 

 highest part of the vertex; anteriorly from this point the vertex slopes to the 

 front. Sides of head suddenly narrowed anterior of the eyes, then suddenly ex- 

 pand to form a conspicuous antennal tubercle on each side. These tubercles are 

 deeply and widely separated by a trough-like sulcus which arises just anterior 

 of the vertexal foveae and extends to the inter-antennal line of front. Front 

 suddenly declivous at end of this sulcus. Clypeus simple, lower than front and 

 longitudinally medianly elevated; clypeus hirsute with long, apically-directed 

 setae in contrast to the general body pubescence. Labrum simple. Genae with a 

 broad, triangular, infra-ocular spine. Maxillary palpi as described for Tyropsis 

 save that the apex of the distal segment is thin, more acute, and with palpal cone 

 set within a very small truncature. 



Antennae eleven-segmented, 1.3 mm. long; simple; segment I elongate- 

 cylindrical; II-VIII subequal in width, slightly narrower than first; second and 

 third subquadrate, subequal; fourth to eighth submoniliform, slightly decreasing 

 in length; club distinctly of last three segments; IX longer than eighth, trans- 

 verse, trapezoidal; X very transverse, trapezoidal, much wider and shorter 

 than ninth; XI very large and coarsely asperate, wider than tenth and nearly 

 as long as preceding three segments united, truncate at base, broadly rounded 

 at apex. 



Pronotum hexagonal, with a straight apical margin and two short oblique 

 sides which continue into two long, straight sides, which in turn abruptly unite 

 to form the wide, straight basal margin. Disc strongly gibbous, the gibbosity 

 culminating in an acute spinoid tubercle near base ; antebasal transverse sulcus 

 nearly semicircular, curving below the discal gibbosity apically each side to 

 end in a circular, perforate lateral fovea; a minute median fovea lies just apical 

 of transverse sulcus, at base of discal spine, and a longitudinal carina extends 

 from basal bead, crossing sulcus, to median fovea. 



Scutellum large, triangular, with apex sinuate-acute. 



Elytra each with sloping humerus ; five strong and asperate costae between 

 lateral and sutural margins; five wide glabrous intervals; two perforate pu- 

 bescent basal foveae, one at base of each of the two innermost intervals, with 

 inner fovea smaller. 



Abdomen large, of five visible tergites with a length ratio of 8/1/.8/1.6/2, 

 only the first tergite visible from above and strongly margined. First tergite 

 medianly, longitudinally elevated into a high carina, this bisecting carina also 

 continued over the next three tergites; last tergite transversely suboval. 



Six stemites in a length ratio of 1/2/.5/.5/.8/1.5, simple, save that the 

 first is heavily pubescent. 



Metastemum glabrous, conspicuously and triangularly elevated into a tu- 

 bercle each side of a wide median sulcoid depression; a tremendous, pubescent 

 fovea at base of median depression. Both intermediate and posterior coxae 

 widely separated. Anterior legs with glabrous trochanters which are compressed 

 and extend apically in a long, thin spine; femora inflated, with a large elongate- 



