334 AMERICAN HYMENOPTERA. 



tarsi of a brighter yellow color, the apical joints of the tarsi more rufous in color- 

 the four anterior tibise marked with black. Tegulae black. Wings almost hya- 

 line, the stigma dark fuscous, the uervures black. Autennal hook brown. %. 

 Total length 7 mm. 



Antennfe stout, the hook sharp-pointed, not reaching to the base of the 12th 

 joint. Clypeus nearly as wide as long, sparsely, weakly punctured, the apex with 

 a distinct rounded incision. Thorax hardly twice longer than wide, closely, 

 strongly punctured, the base transverse, with distinct lateral angles, but not den- 

 tate. Apex of post-scutellum almost transverse, strongly aciculated ; below its 

 centre is a distinct, shining, triangular raised space, which unites with the cen- 

 tral keel of the metanotum, which is strongly aciculated ; its sides, bordered by 

 the keel, are broadly rounded in the centre. Pro- and mesopleura; closely, 

 rugosely punctured ; the metapleurse coarsely aciculated. The apices of the basal 

 two abdominal segments are flat; the 2nd is, if anything, wider than long, and 

 is narrowed at the base. The lower lateral edge of the metanotum ends in a 

 broad tooth. 



Montreal. I cannot make this little species agree with any of the 

 described species with keeled edges of metanotum. It comes into 

 Saussure's Section II., Syn. of Am. Wasps, 177, "the concavity of 

 the metathorax " forming "no distinct lateral angles." 



