100 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



laterotergite subtriangular or subovate, at least one-half as large 

 as posterior laterotergite. Mesothoracic spiracle set in strongly mar- 

 gined circular orifice; much larger than abdominal spiracles. Epi- 

 sternum bearing 4 or 5 fine setae, but without spinelike setae. Euster- 

 num with 6 fine setae (only 2 conspicuous) in transverse row. 



Legs subequal in length. Coxae of prothoracic legs with up to 8 

 spinelike setae and several fine setae on anterior aspect, on meso- 

 thoracic and metathoracic legs with up to 14 spinelike setae and 5 

 to 8 fine setae, spinelike setae mostly in i row; a few fine setae 

 scattered on posterior surface. Trochanter with 5 or 6 spinelike setae 

 on medioanterior surface; i to 4 such setae and 2 or 3 fine setae 

 scattered on posterior surface; 2 well-developed setae on medial 

 aspect. Femur slightly longer and about as wide as trochanter; 

 usually with 7 to 10 spineHke setae on medioanterior surface ; 3 or 4 

 spinelike setae and i or 2 slender setae on posterior surface ; i long 

 seta on medial aspect; a few fine setae on lateral surface. Tibio- 

 tarsus with 4 fine setae around distal margin; 3 or 4 spinelike setae 

 and I slender seta on medioanterior surface; i to 3 spinelike setae 

 on posterior surface. Ungula, when uneroded, about two-thirds as 

 long as tibiotarsus; base well expanded mesally with relatively long 

 medial sclerite bearing 2 fine setae. 



First to eighth abdominal segments subequal ; first segment short- 

 est; fourth to sixth segments widest. Mediotergites (fig. 21, e) 

 with scattered small punctures, sometimes more abundant anteriorly ; 

 transverse branch of impression (trim) dark, slightly sinuate, with 

 6 to 9 minute punctures subequally spaced, on second to eighth seg- 

 ments reaching from one-third to one-half distance from longitudinal 

 branch to middorsal suture, shorter on first segment and slightly 

 longer on seventh and eighth segments ; longitudinal branch of im- 

 pression (loim) extending less than one-half distance from transverse 

 branch to posterior transverse row of setae. Each mediotergite bears 

 from 15 to 25 setae, usually arranged as follows: posterior trans- 

 verse row of 8 to 15 unpaired setae, lateral group of 6 to 10 setae, 

 and I seta toward center of sclerite ; a few exceedingly minute setae 

 sometimes observable on anterior part of sclerite. Laterotergite I 

 extending almost whole length of segment; with 6 to 12 setae, mostly 

 on dorsal and posterior aspects. Pleurite large, subovate, pale, usually 

 with 6 to 12 long setae; size of sclerite and number of setae decrease 

 from first to eighth segment. Sternum divided into 3 parts on first 

 to seventh segments, inclusive, forming 2 laterosternites and i 

 larger mediosternite ; laterosternites each with from 4 to 6 setae. 



