■^ OP NATURAL HISTORY, 741 



Rather smaller tban nigrita F., and may be distinguished by 

 the more dilated punctures ; the basal segment of the abdomen 

 being suddenly smaller than the second, and shorter than in 

 nigrita ; by the abdominal band, and different configuration of the 

 wing cellules. The emargination of the eyes is very small and 

 acute. 



6. M. GIBBOSA. — Black ; petiole as long as the second abdom- 

 inal segment ; wings dusky at tip. 



Inhabits Indiana. 



% Body black; with numerous gray, but not concealing hairs : 

 densely punctured ; punctures large on the head and trunk : wings 

 hyaline ; at tip and including the radial cellule, fuliginous ; stig- 

 ma moderate ; third cubital cellule incomplete ; abdomen, first 

 segment petioliform, as long as the second, and somewhat gibbous 

 at tip, distinguished 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. [299] 



TENGYRA Latr. King. 



T. STYGIA. — Black ; mandibles piceous at tip. 



Inhabits Indiana. 



Body entirely black, immaculate, punctured ; mandibles pi- 

 ceous at tip ; near the tip one-toothed ; wings hyaline ; nervures 

 black, separating nervure of the first and second cubital cellules 

 wanting ; stigma obvious, black : abdomen, segments contracted 

 near th°e incisures : oviduct not extending beyond the terminal 

 processes and concealed beneath them. 



Length two-fifths of an inch. 



Resembles T. Sanvitali Latr., but is larger, with a much larger 

 stigma, and each abdominal segment is much more contracted 

 before its posterior incisure. 



METHOCA Latr. 



M. BICOLOR.— 9 Rufous ; head and part of the tergum black. 



Inhabits Indiana. 



Body pale yellowish-rufous, polished : head black : antennae 



1835.] 



