220 NEOTROPICAL PSELAPHIDAE 



divergent to the antero-lateral angles which are coarsely punctate; anterior 

 half of vertex medianly excavated to form a deep glabrous fossa. Frontal 

 margin evenly concave between antennal bases with two short, contiguous, 

 triangular teeth at middle; front densely pubescent and declivous between 

 antennae, the median portion of this declivity produced into an obconical, 

 glabrous tubercle from the base of which arises on each side a tuft of con- 

 spicuous setae. Clypeus greatly elongated and strongly tumid; the apical 

 margin is a black bead strongly produced in an obtuse angle; surface with 

 erect pubescence and granulate-punctate, the tumidity ascending dorso- 

 posteriorly in an obtuse angle. Considering the clypeus as a whole, therefore, 

 the angulate apical and basal margins give it a symmetrical parallelogram 

 outline. The median angle of elevated basal margin is strongly carinated and 

 elevated to partially obscure the obconical appressed tubercle of the front. 



Maxillary palpi four-segmented and simple ; first segment minute ; second 

 sharply arcuate at base, elongate, slender for basal three-fourths and expanded 

 in apical fourth ; third short, rounded triangular with the usual convex external, 

 and short subangulate internal, faces; fourth longer than second, twice as 

 wide as third, base lengthily oblique, apex subacute, convex external face, 

 sinuate-convex internal face; palpal cone short, thick, conical. 



Antennae eleven-segmented, coarsely punctate, distant, abnormal; seg- 

 ment I obtrapezoidal, wider than the eleventh segment, longer than second and 

 third united, with the mesio-apical angle strongly produced; II and III sub- 

 equally wide, second moniliform, third slightly shorter and transversely asym- 

 metrical; IV large, longer than any other segment save the eleventh, and 

 wider than any other segment save the first and last three, asymmetrically 

 elongate with the basal end much wider than apical end and the mesio-basal 

 angle produced; V, VI, VII, VIII subcylindrical, fifth longest of these four, 

 next two subequal, eighth shortest; IX elongate hexagonal; X transverse 

 hexagonal; XI as long as preceding two united, with truncate base and sub- 

 acute apex. 



Pronotum rounded hexagonal in outline, widest in anterior third, with 

 evenly convex disk; basal third with an arcuate-transverse glabrous sulcus, 

 the median posterior margin of which is produced anteriorly into a short, acute 

 cusp; sulcus ends on each side in an obscure fovea. 



Elytra with prominent, obliquely elevated humeri ; each elytron with three 

 large nude basal foveae and an entire sutural stria. 



Wings long and well-formed. 



Abdomen with five tergites; first with a strong lateral margin for the 

 basal two-thirds as a consequence of an external and an internal carina, apical 

 third of segment not margined and not carinated; this first segment two and 

 a half times longer than next two united; second and third subequal and with- 

 out lateral margins; fourth half the length of first; fifth shorter than fourth, 

 rounded subtri angular. 



Abdomen with six sternites fully visible. Fifth (next to last) large, 

 glabrous, as long as first four united, with a conspicuous median depression 



