154 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



usually with 5 to 7 spinelike setae on medioanterior surface ; 2 or 3 

 spinelike setae and i slender seta on posterior surface ; i long seta on 

 medial aspect; i or 2 minute setae on lateral surface. Tibiotarsus 

 with 6 setae around distal margin; 2 or 3 spineHke setae on medio- 

 anterior surface; 2 or 3 spinelike setae on posterior face. Ungula, 

 when uneroded, almost as long as tibiotarsus. 



First to eighth abdominal segments subequal ; first segment short- 

 est ; seventh and eighth segments very slightly narrower. Medio- 

 tergites somewhat rugose and with small shallow punctures, rugosity 

 and punctation becoming stronger from first to eighth segments ; 

 transverse branches of impressions sinuate, reaching to or nearly to 

 middorsal suture on second to fifth segments, sometimes nearly as 

 long on sixth segment, shorter on other segments especially first and 

 eighth; longitudinal branch of impression extending approximately 

 one-half distance from transverse branch to posterior transverse 

 row of setae. Anterior part of each mediotergite usually with 4 setae, 

 2 (rarely 3) lying within transverse branch of impression, i toward 

 middle of sclerite, equidistant from branches of impression, and i 

 laterad to impression. Posterior part of each mediotergite with 5 

 large setae arranged as 2 pairs (sometimes only semipaired) and i 

 unpaired seta farther laterad ; sometimes i minute seta near unpaired 

 large hair; sometimes, especially on more posterior segments, up to 

 5 additional small setae, usually slightly posterior to row of larger 

 setae. Laterotergite I extending length of segment ; with i large seta. 

 Spiracles subequal ; in extreme posterior end of spiracular sclerite, 

 which is small, subovate, about twice length of spiracle and situated 

 in anterior half of each segment. Pleurite small, becoming narrower 

 in more posterior segments ; with i prominent seta and sometimes 

 I or 2 minute hairs. Sternum of i piece, subquadrate; without defi- 

 nite impressions or sutures, but with a few small shallow pits ; bear- 

 ing I prominent seta near each corner and usually a few minute 

 setae along lateral margins. 



Ninth abdominal segment (fig. 29, b), exclusive of urogomphi, 

 slightly shorter than eighth abdominal segment and almost as wide ; 

 as long as wide; sides of anterior half subparallel, posterior half 

 tapering caudally making width at anterior margin of caudal notch 

 about three-fifths to two-thirds greatest width of segment. Dorsum 

 flat to slightly convex, sloping downward from front to back. Dorsal 

 plate (dpla) roughened by irregular lines, wrinkles, and a few scat- 

 tered pits; 4 faint longitudinal impressions, 2 laterally (Urn) and a 

 paramedial pair (pirn) which converge posteriorly but do not meet; 



