128 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



sized conical "sensory" appendix just ventrad to base of third joint. 

 Terminal segment small, barely one-half as long as second joint and 

 about one-fourth as wide ; 4 setae on apex. 



Mandibles of moderate length, robust, about two-thirds to three- 

 fourths as wide at base (ventral aspect) as long; retinaculum well 

 developed ; penicillus sometimes reaching base of retinaculum. Distal 

 half inward bending ; pointed ; outer surface convex with deep dorsal 

 groove ; inner face slightly excavate with small median carina, ventral 

 margin of inner face sharp and slightly convex ventrally, dorsal 

 margin sharp and strongly convex dorsally. 



Ventral mouthparts at least four-fifths as wide across bases of 

 stipites as across anterior ends of stipites. Cardines slightly separated. 

 Stipes large, subrectangular ; proxistipes and dististipes not distinct ; 

 usually 5 prominent setae on antero-lateroventral aspect. Galea with 

 basal segment subcylindrical, slightly shorter than terminal segment, 

 without setae or pores ; terminal joint narrower than basal segment, 

 outer surface longer than inner surface, 5 to 7 pores on lateroventral 

 aspect. Maxillary palpi with all joints subcylindrical. First joint wider 

 than long ; distally on mesoventral surface with group of 5 to 8 small 

 pores and i large and i small seta, sometimes i or 2 additional minute 

 setae. Second segment as long as wide ; as long as first joint and 

 three-fourths as wide ; without setae ; 2 to 4 pores. Third joint almost 

 as long as wide ; about one-half length of second segment ; with 2 or 

 3 pores ventrally; distally with i minute seta on mesoventral aspect 

 and I near lateral margin. Fourth segment as long as wide ; more than 

 one-half length of third joint; without setae or pores. Postmentum 

 with I long seta near each corner and sometimes i small seta short 

 distance caudad to each long anterior hair; few minute pores. First 

 prementum with 2 large setae just caudad to base of each palpus, 

 making transverse row of 4 hairs. Labial palpus with basal joint cy- 

 lindrical, about one-half length of first prementum, longer than wide, 

 without setae, with 5 or 6 pores ; terminal segment approximately 

 one-half length and less than one-half width of basal segment, with- 

 out setae, usually with i pore. 



Prothorax about three-fourths combined length of mesothorax 

 and metathorax; wider posteriorly; slightly wider than long. Ter- 

 gites minutely punctulate ; anterior part of each tergite usually with 6 

 to 8 setae in transverse row, only 2 most medial setae always paired, 

 others variable, sometimes in semipaired arrangement; posterior part 

 of each tergite usually with 5 or 6 setae in transverse row, 2 most 

 medial setae always paired, 2 most lateral setae often paired or semi- 



