252 NEOTROPICAL PSELAPHIDAE 



between the orifices of the second and third basal foveae; (5) sutural stria entire, 

 arising from the most mesial basal fovea. The elytron, therefore, has three 

 entire carinae in addition to the sutural stria. 



Abdomen with five tergites with proportions as given above; first nar- 

 rowed at base, with a strong lateral margin formed of an external and an 

 internal carinae which converge apically but do not join; second and third 

 tergites with the two carinae very short; fourth tergite with a short, con- 

 spicuous horn arising each side near base and partially covered by the lateral 

 margin of the corresponding sternite. First tergite deeply, transversely de- 

 pressed at base, this depression primarily divided into three subequal cham- 

 bers by a pair of long, parallel basal carinae which extend to apical third; 

 second and third tergites also with a pair of long basal carinae. 



Abdomen with seven stemites, with complex modifications: first sternite 

 clearly visible laterad of coxal-trochantal articulation, and between coxae as a 

 short, longitudinally carinated and glabrous area. Second not longer than first, 

 but visible from side to side. Third as long as second, medianly glabrous and 

 bearing medianly a very large, erect, subcylindrical spine; this spine is 

 obliquely truncate and holds a small tube, the orifice being seen on the 

 posterior portion of the truncate apex. Fourth sternite as long as third, medianly 

 glabrous and bearing a tubercle in apical third. Fifth sternite medianly as long 

 as fourth, but with the apical margin semicircular; medianly glabrous. Sixth 

 sternite semicircular, fitting into the apical outline of the fifth, wholly 

 glabrous, medianly tumid and as long as the preceding three stemites united, 

 and with two projections: first a strong tubercle at center of tumid disc, this 

 tubercle bearing apically two strongly divergent tufts of setae so that the 

 tubercle appears bifurcated; second, a strongly recurved or rolled, lamelloid, 

 truncate plate from center of apical margin. Seventh sternite is a small, 

 medianly tuberculated plate between the last tergite and the sixth sternite. 



Tarsi normal for the tribe. 



Anterior trochanters with a short spine at base of ventral face. 



Anterior tibiae highly modified: middle third of length dorso-ventrally 

 flattened and widened; apical fourth of length laterally flattened; entire tibiae 

 dorsally concave so that the wide middle portion is at a lower level than both 

 ends; anterior edge with two strongly formed and broadly triangular teeth, 

 one tooth at middle and one tooth near apical fourth just basal to laterally 

 flattened apical area, both teeth in the plane of the dorso-ventral flattened 

 portion; a small conical tooth projecting ventrally from ventral face, just 

 apical of first triangular tooth. 



Intermediate femora inflated, with the ventral face flattened and arcuate. 



Intermediate tibiae inflated medianly, with the ventral face flattened and 

 sinuate. 



Metastemum medianly glabrous and tumid, with a subentire median 

 longitudinal sulcus which deepens apically to terminate in a subapical fovea. 



Described on two males (type and paratype) from Corumba, Matto 

 Grosso, Brazil. Named for my friend, H. S. Barber. 



