60 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



about one-half width of basal joint; without setae; usually with i 

 pore. 



Prothorax about three-fourths combined length of mesothorax and 

 metathorax ; only very slightly wider posteriorly ; slightly wider than 

 long. Tergites minutely punctulate; anteriorly with about 7 setae 

 (on each side of median dorsal suture) in transverse row, usually 

 arranged as 3 pairs (i short and i long seta in each pair) and i 

 unpaired seta farther laterad; posteriorly with 6 setae in trans- 

 verse row arranged as 3 pairs (i short and i long seta in each pair) ; 

 usually I or 2 minute unpaired setae near center of sclerite. Epi- 

 sternum usually with i large and i or 2 smaller setae near center and a 

 few minute hairs near margin adjacent to presternum. Epimeron with 



1 or 2 minute setae. Presternal area consisting of 4 sclerites as fol- 

 lows : A small posterior median sclerite, anteriorly attenuate, bearing 



2 fine setae anteriorly; 2 large subtriangular lateral sclerites striate 

 on anterolateral aspect, with i stout bristle laterad to center and a 

 diagonal row of 3 or 4 minute setae on anteromedial aspect; and a 

 very narrow, median, anterior piece. Eusternum small, membranous 

 or weakly sclerotized. Sternellum and poststernellum indefinite, small, 

 membranous or weakly sclerotized. 



Mesothorax and metathorax each about twice as wide as long. 

 Mediotergites sparsely punctulate; impressions indistinct. Anterior 

 part of each mediotergite with transverse row of 4 small unpaired 

 setae, the most lateral seta largest ; posterior part of each mediotergite 

 with transverse row of 4 to 6 setae, arranged as 2 pairs (i short and i 

 long seta in each pair) and sometimes i or 2 unpaired setae ; i pair 

 of setae on lateral aspect of mediotergite; additional minute setae 

 sometimes observable in punctures, especially in anterior part of 

 sclerite. Anterior laterotergite subtriangular, almost one-half as large 

 as subovate posterior laterotergite. Episternum bearing up to 5 (usu- 

 ally 3 or 4) spinelike setae. Mesothoracic spiracles about equal in 

 size to or very slightly larger than spiracles in abdomen. 



Legs subequal in length. Coxa usually with 20 to 30 spinelike setae 

 on anterior aspect, mostly in 2 or 3 oblique rows ; i or 2 stout setae 

 and a few small, scattered hairs on posterior surface. Trochanter 

 with 5 to 7 spinelike setae on medioanterior surface; 3 to 6 such 

 setae and i or 2 fine setae scattered on posterior surface; 2 

 well-developed setae on medial surface. Femur usually with 4 to 8 

 spinelike setae on medioanterior surface ; 2 to 4 spinelike setae and i 

 slender seta on posterior surface; i long seta on medial aspect; i or 

 2 fine setae on lateral surface. Tibiotarsus with 5 or 6 setae around 

 distal margin ; 2 or 3 spinelike setae on medioanterior surface ; 2 or 



