52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



ment ; 2 pores ventrally ; clistally with i minute seta on mesoventral 

 aspect and i near lateral aspect. Fourth segment as long as wide or 

 slightly longer than wide; about as long as third joint; i minute seta 

 near middorsal aspect. Postmentum with i long seta near each 

 corner, few minute pores scattered over surface. First prementum 

 with 3 to 5 large setae just caudad to base of each palpus, forming 

 transverse row of 6 to 10 hairs. Labial palpi with basal segment 

 cylindrical, one-half length of first prementum, as long as wide, with- 

 out setae, bearing up to 7 pores ; terminal segment shorter than basal 

 joint and about one-half as wide, without setae, usually with i pore. 



Prothorax about three-fourths combined length of mesothorax and 

 metathorax; wider posteriorly; slightly wider than long. Tergites 

 with scattered small shallow pits ; anteriorly with 7 to 9 setae (on each 

 side of median dorsal suture) in transverse row, usually arranged as 

 follows : the 2 most medial setae always paired, the next i or 2 setae 

 unpaired, then a group of 3 setae and finally i unpaired seta con- 

 siderably farther laterad; posteriorly with 5 to 8 (usually 6 or 7) 

 setae in transverse row arranged as 3 pairs subequally spaced, or as 2 

 pairs with a group of 3 setae between, sometimes with i additional 

 small seta between each pair and slightly farther caudad ; glabrous 

 elsewhere. Episternum with i large and 2 small setae. Epimeron 

 bearing i prominent seta and i to 3 small or minute setae. Presternal 

 area consisting of 4 sclerites as follows : a small posterior median 

 sclerite, anteriorly attenuate; 2 large subtriangular lateral sclerites, 

 each striate on anterolateral aspect, with i stout seta laterad to center 

 and a diagonal row of 5 minute setae or pegs on anteromedial aspect. 

 Eusternum small, membranous or weakly sclerotized. Sternellum and 

 poststernellum indefinite, small, membranous. 



Mesothorax and metathorax each about twice as wide as long. 

 Mediotergites punctulate; impressions indistinct, reduced to short 

 row of small pale pits. Anterior part of each mediotergite with i 

 seta, near lateral margin; i pair large setae farther caudad along 

 lateral margin ; posterior part of mediotergite with 2 pairs conspicuous 

 setae and sometimes i or 2 additional small hairs ; minute setae some- 

 times observable in some of pits. Anterior laterotergite subtriangular, 

 one-half as large as subovate posterior laterotergite. Each episternum 

 bearing up to 11 spinelike setae (usually 6 or 7). Eusternum with 

 transverse row of 4 to 6 fine setae. Mesothoracic spiracle subequal 

 in size to spiracles in abdomen. 



Legs subequal in length. Coxa with up to 50 (usually 25 to 45) 

 spinelike setae on anterior aspect; 4 or 5 stout setae and a few scat- 

 tered fine hairs on posterior surface. Trochanter less than one-half 



