278 NEOTROPICAL PSELAPHIDAE 



is recessed in the integument. Sides of head sharply narrowed and angulated just 

 anterior of eye, the angle continued mesio-obliquely as a deep, pubescent in- 

 cisure, and then elevated into an ovoidal, distinct antennal tubercle each side. 

 A small vertexal fovea lies as the end of each incisure. Front between antennal 

 tubercles flat, with a drum-shaped platform or circular tumulus at middle of 

 flattened inter-antennal line. Front below int^rantennal line, and clypeus decliv- 

 ous and perfectly simple; labrum simple; ventral surface of head simple. Tem- 

 poral beard well-developed. 



Maxillary palpi yellow, four-segmented, moderately elongate and slender; 

 first segment short, slightly wider than base of second; second elongate, slender 

 and arcuate in basal two-thirds, gradually broader in apical third; third one- 

 third as long and subequal in width to second, elongate-triangular; fourth one- 

 fourth longer than second and distinctly wider than third, subtruncate at base, 

 broadening to middle, thence narrowing to acute, minutely truncate apex which 

 bears a distinct palpal cone. 



Antennae half as long as body (0.74 mm.), distant, eleven-segmented, very 

 abnormal; segment I large, elongate-cylindrical, as long as next three united 

 (0.134 mm.) and as wide as sixth; II elongate-ovoidal; III-VI subequal in 

 length, third briefly obconical, fourth moniliform, fifth transverse-moniliform, 

 sixth slightly wider with mesial face narrowly, subacutely produced ; VII longer 

 and wider, transverse-pyramidal, with mesial face also strongly produced ; club 

 distinctly formed of next four segments; VIII, IX and X very irregularly but 

 strongly transverse, with their ventral faces deeply and completely excavated, 

 each excavated face at a different plane than the other two, and the eighth also 

 with a pubescent, laminoid horn on its dorso-mesial face; XI much narrower 

 than any of the preceding three but as long as preceding four united (0.19 mm.) , 

 base circular and regularly truncate, segment in two parts, a basal subcylindri- 

 cal half and a conical half set within the circular distant rim of the wider basal 

 portion reminiscent of the condition in Thesium. 



Pronotum subquadrate with evenly convex disc and gradually diverging 

 sides to basal fourth where the margins become obliquely narrowed ; base crossed 

 by an arcuate antebasal sulcus at this point, the sulcus deepening laterally to 

 end in a large, very deep, pubescent fovea each side. 



Scutellum small, acute-triangular. 



Elytra entirely simple, lacking basal foveae and with unmodified flanks; 

 sutural stria rudimentary. 



Wings present and moderately well-developed. 



Abdomen with five visible tergites in a length ratio of 2.5/1/1/1.5/.8 and 

 margins well-formed as follows: first each side with a pair of strong, arcuate, 

 parallel, subentire carinae; second and third with a single, straight carina for 

 basal half on each side. 



Six stemites in a length ratio of 1.2/1.2/.7/.5/.4/1.2 and all simple and 

 convex; first visible from side to side, with a large circular, pubescent fovea 

 between posterior coxae as in Phybytharsis ; sixth with apical margin simply 

 rounded. 



