212 NEOTROPICAL PSELAPHIDAE 



fifth; VIII distinctly shorter and narrower than seventh. Club of last three 

 segments, jointly forming an arc so that they have a secondary geniculation ; 

 IX longer than seventh and eighth united, asymmetrically suboblong with 

 obliquely truncate base and rounded apex; X from a lateral view strongly tri- 

 angular, with the ventral face narrow and acute and the dorsal face long, 

 strongly produced in an arcuate, truncated tooth from the antero-dorsal angle 

 of segment; XI subcorneal with subsinuate dorsal face and subacute apex. 



Maxillary palpi short and four-segmented, the fourth segment carried in a 

 forward arc, strikingly similar to the way in which the antennal club is car- 

 ried; first segment minute; second elongate-arcuate, gradually thicker in 

 distal three-fourths; third short and obconical, half as long as second and 

 about as wide; fourth only slightly longer than second and about three times 

 as wide, apex rapidly formed and briefly acute, with no discernible palpal cone. 



Pronotum relatively simple, not spinose; disc with a deep, narrow but 

 well-defined median longitudinal sulcus from apical six-sevenths to basal two- 

 sevenths, each side evenly tumid lateral to this sulcus. No lateral longitudinal 

 sulci and no transverse basal sulcus. Basal two-sevenths constricted and more 

 densely granulate with about six feeble impressions. 



Elytra relatively simple with unarmed humeri, no dorsal sulcus or stria; 

 each elytron with a well-formed, subentire sutural stria and a single basal 

 fovea. 



Wings well-developed, three times as long as elytra when fully extended, 

 closely and minutely setose. 



Abdomen with five tergites; first as long as next two united, these last 

 two subequal; fourth nearly as long as first; fifth rounded subtriangular, about 

 twice as long as first. Lateral margins of the abdomen very narrow and 

 carinoid save at base of first tergite. 



Seven sternites; first a subtrapezoidal, depressed plate between posterior 

 coxae and nearly as long as these coxae medianly, clearly visible laterally; 

 second slightly longer than first; third, fourth, and fifth progressively shorter; 

 sixth long, as long as second to fifth inclusive united, flattened medianly with 

 a deep V-shaped incision for apical half of length; seventh, three-fourths as 

 long as sixth, obliquely and longitudinally divided into a right and a left tri- 

 angular plate. 



Metastemum broadly flattened and depressed medianly, with each side 

 elevated into a well-defined, obtuse tubercular swelling; the posterior margin 

 of metasternum medianly truncate and laterally near each posterior coxa ex- 

 tended posteriorly into an obtuse projection. 



Posterior coxae widely separated. Femora simply inflated. Anterior 

 trochanters each armed with a long, lamellate, narrow and truncate spine on 

 the ventral face; other trochanters simple. Anterior tibiae with an elongate 

 sulcoid scar with carinated margins extending from base to apical two-thirds 

 on antero-ventral face; other tibiae simple. Tarsi of regular metopiine pro- 

 portions with two very unequal tarsal claws. 



Allotype Female. Similar to holotype save (1) integuments are very light 



