78 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



Mandibles of moderate length, robust; at least three-fourths as 

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

 penicillus sometimes reaching base of retinaculum. Distal half curv- 

 ing inward, pointed ; outer surface convex with short, shallow, in- 

 conspicuous 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 about two-thirds as wide across bases of stipites 

 as at anterior ends of stipites. Cardines separated by a distance 

 equivalent to about one-half greatest width of single cardo. Stipites 

 large, subrectangular, proxistipes and dististipes not distinct ; usually 

 4 to 6 prominent setae on antero-lateroventral aspect. Galea 2-jointed ; 

 basal joint subcylindrical, not well defined, shorter than terminal joint, 

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

 outer margin longer than inner margin, i pore on lateroventral aspect. 

 Maxillary palpi with all segments subcylindrical. First joint wider 

 than long ; distally on mesoventral surface with group of 2 or 3 small 

 pores and i or 2 setae. Second joint wider than long ; about as long 

 as first joint and almost as wide; without setae; i or 2 pores. Third 

 joint almost as long as wide; about one-half length of second joint; 

 2 pores ventrally; distally with whorl of 4 small setae. Fourth joint 

 slightly longer than wide; as long as or longer than third joint; with- 

 out setae or pores. Postmentum with i long seta at each corner and 

 I small or minute seta short distance anterad to each long anterior 

 hair; 2 to 4 minute setae along each side. First prementum with i 

 large and i small seta just caudad to base of each palpus, forming 

 transverse row of 4 setae. Labial palpus with basal joint about one- 

 half length of prementum, longer than wide, without setae, 2 pores ; 

 terminal joint narrow, but only slightly shorter than basal segment, 

 without setae, usually with i pore. 



Prothorax about three-fourths combined length of mesothorax and 

 metathorax ; wider posteriorly ; about as wide as long. Tergites with 

 minute punctures near middorsal suture, somewhat larger punctures 

 laterally; anteriorly with 6 to 10 setae (on each side of median dorsal 

 suture) in transverse row, usually 5 to 7 conspicuous, none definitely 

 in pairs ; posteriorly with 5 or 6 unpaired setae in transverse row, all 

 well removed from middorsal suture ; glabrous elsewhere. Episternum 

 with I large seta and 3 or 4 small, fine hairs. Epimeron sometimes 

 bearing i or 2 minute setae. Presternal area consisting of 4 sclerites 

 as follows : A small posterior median sclerite, anteriorly attenuate, pos- 

 teriorly rounded, bearing 2 minute hairs anteriorly; 2 large sub- 

 triangular lateral sclerites striate on anterolateral aspect, with i stout 



