North American Hymenoptera. 261 



and with elevated lines: wings hyaline; nervures fus- 

 cous, light brownish towards the base : stigma triano-ular, 

 fuscous ; second cubital cellule destitute of the exterior 

 nervure ; terminal nervures obsolete : tergum with laro"e 

 close-set punctures; towards the tip somewhat polished; 

 first segment with a yellow lateral margin, dilating a 

 little towards the tip ; third segment with a yellow point 

 on the lateral margin : abdomen each side and beneath, 

 except at tip, yellowish : oviduct black, nearly as long as 

 the abdomen, with rather long hairs : feet honey-yellow ; 

 posterior tibiae, excepting at base, black : posterior tarsi 

 blackish, with the incisures pale. 



^ Coxse and anterior pairs of tibiae and tarsi whitish ; 

 posterior tibiae at tip only, dusky, at the extreme base 

 whitish ; second cubital cellule complete ; terminal wing- 

 nervures distinct. 



Length <J over one tenth, ? less than three twentieths 

 of an inch. 



2. M. mellijfes. Black; thorax with oblique, lined 

 sutures ; feet honey-yellow. 

 Inhabits Indiana. 



F 



$ Body black : hypostoma somewhat prominent along 

 the middle : stemmata rather prominent : antenna be- 

 neath towards the base piceous: mandibles honey-yel- 

 low : palpi blackish or fuscous : thorax with two oblique 

 impressed lines confluent behind, in which are several 

 transverse lines; and a transverse more dilated one at 

 the base of the suture : wings hyaline ; nervure of the 

 radial cellule as distinct as the others; second cubital 

 cellule destitute of its termmal nervure ; apicial nervures 

 less distinct than the discoidal ones, but not obsolete: 

 <€r§-Mm somewhat fusiform, polished, a little hairy at base 



cox<B honey-yellow : tihice and tarsi dusky. 



thighs 



