26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



ventrally, consisting" of 3 pale sclerites as follows : A small, incon- 

 spicuous, medial piece, variable in shape but usually subrectangular, 

 glabrous ; 2 larger lateral sclerites, subovate, more strongly sclerotized 

 than medial piece, bearing many minute setae. Eusternnm {exist) 

 membranous or very faintly sclerotized, w^ith transverse row of 6 to 

 10 fine setae (usually only 6 readily observable) and sometimes with 

 2 minute paramedian setae farther forward. Furcal pits absent. 

 Steniellum (stl) membranous, glabrous. Poststernelhim (pstn) mem- 

 branous except for 2 inconspicuous, tiny, subtriangular posterior 

 sclerites; glabrous. 



Metathorax {III, fig. 5, a, h) very similar to mesothorax. Ante- 

 rior laterotergite {Itga) without spiracle. 



Legs (fig. 5, h, d) well developed, subequal in length, strong. Coxa 

 {ex) sessile, oval, excavated on outer surface for reception of tro- 

 chanter and femur ; usually from 30 to 40 spinelike setae on anterior 

 aspect, arranged in irregular longitudinal rows ; several setae, some 

 spinelike, scattered over posterior surface. Trochanter {tr) sub- 

 cylindrical, outer face short, inner face about one-half length of coxa, 

 with 10 to 15 spinelike setae and a group of 5 or 6 pores on medio- 

 anterior surface; 8 to 12 such setae and i fine seta scattered on 

 medioposterior surface; 2 well-developed fine setae on medial aspect. 

 Femur {fe) obliquely attached to trochanter; subcylindrical, outer 

 face longest ; about as long as trochanter, but slightly narrower ; 

 usually with 8 to 1 1 spinelike setae on medioanterior surface ; 3 to 5 

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

 medial aspect; i or 2 fine setae on lateral surface. Tibiofarsus (ti-fa) 

 subcylindrical, about as long as femur but narrower ; 5 or 6 setae 

 (some rather short and stout) around distal margin; 4 to 6 spine- 

 like setae and i slender seta on medioanterior surface ; 3 spinelike 

 setae on posterior surface. Ungula {un) well developed, when 

 uneroded almost as long as tibiotarsus ; dark, curved ; base expanded 

 mediad ; small medial sclerite at base, bearing 2 fine setae. 



First to Eighth Abdominal Segments (figs. 2, b; 6, a, b, c) 

 subequal; when fully distended, each segment is almost as thick as 

 wide ; first segment shortest ; fourth to sixth segments widest. Medio- 

 tcrgites {mtg) with scattered small, shallow punctures; posterior 

 margins longitudinally striate. Prominent right-angled impression 

 {im) on anterolateral aspect of each mediotergite, inner margin 

 slightly sunken and pale, outer margin darker and somewhat sinuate ; 

 transverse branch {trim) curving slightly backward, on second to 

 eighth segments extending approximately one-third distance from 



