OF NATURAL HISTORY. 695 



2. 0. GLABRATUS. — Houey-yellow ; a glabrous spot in the 

 large cubital cellule. 



Inhabits Indiana. 



Body dull honey-yellow : head bright yellow : antennae, mouth 

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

 cellule beyond its middle with a longitudinally oval glabrous 

 space, but destitute of any opake spot : metathorax transversely 

 wrinkled near the petiole of the abdomen. 



Length about four-fifths of an inch. 



Much Vike pur ffatns nob., with a similar glabrous spot in the 

 cubital cellule, but this spot is destitute of any appearance of 

 the opake coriaceous spots which distinguish that species. 



3. 0. MUNDUS. — Black; antennae, posterior tibiae and tarsi 

 yellow. 



Inhabits Indiana. 



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

 greenish-yellow : anfennse fulvous yellow ; three or four basal 

 joints above black; the first joint beneath greenish-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 tibiae yellowish : [248] posterior pair 

 with the tibiee, excepting the tip, and the tarsi, excepting the 

 terminal joint, fulvous-yellow. 



Length nearly one inch. 



liesemhles Jlavicornis nob., which, however, has the first seg- 

 ment of the abdomen considerably longer than the second. It is 

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

 the wings blue, tipped with brown, and the legs black, the ante- 

 rior ones testaceous. 



4. 0. BILINEATUS nob. — Contributions of the 3Iacliirian 

 Lyceum, p. 75. 



This is the analogue of the 0. /ufcus Fab. 



5. 0. BRACHIATOR.— Black ; abdomen and feet yellowish ; a 



petiolated second cubital cellule. 



Inhabits Indiana. 



Antenna, first joint beneath, white : mandibles whitish, piccous 



1835.] 



