North American Hymenoptera. 293 



Inhabits Indiana. 



$Bodii a little hairy, lineated with impressed lines, 

 which are more distinct on the metathorax, black, slightly 

 tinged with piceous : antennce with a plceous tinge ; first 

 joint not longer than the three following ones together : 

 wings dusky ; discoidal nearly as long again as broad ; 

 second cubital sessile, the separating nervure from the first 

 cubital rather abruptly inflected towards the base, and 

 nearer the base almost obsolete, the other includino- 

 nervure rectilinear; separating nervures between the first 

 cubital and radial, and the second and third cubitals, 

 forming a broken or slightly dislocated line, the former 

 almost entering the third cubital : meiathorax without 

 lineations on the posterior declivity, the spines distinct: 

 abdomen polished, without lines; petiolar segments or 

 nodes very distinct, subequal, the posterior one rather 

 larger and spherical: feet more obviously tinged with 

 plceous at base. 



Length less than one fifth of an inch. 



The connexion between the radial and second cubital 

 is very slightly petiolated, and the separating nervure be- 

 tween the first and second cubitals, is almost or quite 

 angulated, and is less distinct towards its junction with 

 the discoidal cellule. 



'r--' 



M 



thorax 



what tinged with piceous : wings with a very slight tinge 

 of yellowish ; discoidal cellule in length nearly twice its 

 breadth; separating nervure between the first and second 

 cubital cellules abruptly ending at the middle of the 

 usual length, being entirely wanting on the basal half. 



Length over one fifth of an inch. 



6. M. moUsta. 9 Body pale honey-yellow, immacu- 

 late : antenncB with the two ultimate joints much larger 



k. 



