r 



298 Sai/s Descrijjtions of 



ure of the 2d and 3d cellules rectilinear: metathorax 

 reticulate with larger discoidal punctures and having at 

 base an oblong triangle : tergum^ first segment shorty 

 abruptly smaller than the second, petiollform; with dis- 

 coidal punctures, hairy, abrupt before^ and on the ante- 

 rior inferior tip having an angle on each side ; second 

 segment with the punctures rather distant, profound, with 

 a band of whitish hairs on the posterior margin ; remain- 

 ing segments with numerous whitish hairs, and a dorsal 

 elevated line. 



Length less than three tenths of an inch. 



Rather smaller tban nignta, F. and may be distin- 

 guished by the more dilated punctures; the basal seg- 

 ment of the abdomen being suddenly smaller than the 

 second, and shorter than in nigrka; by the abdominal 

 band, and different configuration of the wing cellules. 

 The emargination of the eyes is very small and acute. 



6. M. gibhosa. Black ; petiole' as long as the second 

 abdominal segment ; wings dusky at tip. 



Inhabits Indiana. 



$ Body black ; with numerous gray, but not conceal- 

 ing, hairs ; densely punctured ; punctures large on the 

 head and trunk: wings hyaline ; at tip and including the 

 radial cellule, fuliginous ; stigma moderate ; third cubital 

 cellule incomplete : abdomen, first segment petioliform, 

 as long as the second, and somewhat gibbous at tip, dis- 

 tinguished from the second by a deep stricture. 



Length over three tenths of an inch. 



Resembles scrupea. Nob., but is larger, has a stigma 

 and longer petiole. It is also like nigrita, F. but is 

 larger, with a much more obvious stigma ; wings dusky 

 at tip; the petiole more gibbous at tip,°&c. 



^ 



