OF NATURAL IIISTOUY. 695 



2. 0. OLAniVATL-s. — lloncy-ycUow ; a glabrous spot in the 

 large cubital cellule. 

 Tiiliabits Indiana. 



Body dull honey-yellow : head bright yellow : antenuai, uiouth 

 and steramata honey-yellow : eyes blackish : wings, first cubital 

 cellule beyond its middle with a longitudinally oval glabrous 

 space, but destitute of any opake spot : nietathorax transvcrsi-ly 

 wrinkled near the petiole of the abdomen. 

 Length about four-fifths of an inch. 



Much Wkc punjatus nob., with a similar glabrous spot in the 

 cubital cellule, but this spot is de.'^titute of any appearance vf 

 the opake coriaceous spots which distinguish that species. 



3. 0. MUNDUS.— Black ; antenuaD, posterior tibiiO and tar.-i 

 yellow. 



Inhabits Indiana. 



S Body black : head with the front, nasus and anterior orbitrt 

 greenish-yellow : antenmc fulvous yellow ; three or four ba.sal 

 joints above black; the first joint beneath greeni.-h-yellow : trunk 

 with rather dense, short hairs : wings purple-black : abdomen 

 much compressed: basal joint cylindrical; second segment as 

 long as the first, or a little longer, compressed towards the tip : 

 anterior pair of the feet yellowish before : intermediate pair with 

 a line before and base of the tibiaj yellowish : [248] posterior pair 

 with the tibis, excepting the tip, and the tarsi, excepting the 

 terminal joint, fulvous-yellow. 

 Length nearly one inch. 



Resembles .//ai'tc'onu's nob., which, however, has the first seg- 

 ment of the abdomen considerably longer than the .<econd. It is 

 also allied to mono Fab., but that species is described to have 

 the wings blue, tij^ped with brown, and the legs black, the ante- 

 rior ones testaceous. 



4. 0. BILINEATUS nob. — Contributions of the Ma.ln.ian 



Lyceum, p. Tii. 



This is the analogue of the 0. htfnts Fab. 



5. 0. BRAClir.vTOR.— Black ; abdomen and feet yellowish ; a 

 petiolated second cubital cellule. 



Inhabits Indiana. . . 



Antennx, first joint beneath, white : mandibles whitish, piccou-s 



1835.] 



