NORTH AMERICAN HYMENOPTERA. 233 



Basin of face smooth (more largely just below the cross carina), anterior 

 margin of the groove containing the pits of third segment straight; 

 pits normal rounded. 



Median teeth short, stout and rounded dorsalis. 



Median teeth long, slender and pointed. iiiontana 



Basin of face striate, anterior margin of the groove containing the pits of 

 third segment arched inwardly by the increased size of the median 



pits Frey-Gessneri. 



Basin of face finely punctured. 



Each side of the face covered with long white hairs; as seen from the 

 side the outer apical teeth are long and slender and decidedly turned 



<iown hirsuta. 



No long white hairs covering the face; the outer apical teeth as seen from 

 the side are abrupt, triangular and projecting in a line with the 

 lateral margin. 

 Median teeth closer together than the median and outer teeth ; outer 

 teeth, hardly projecting, about six or eight distinct large semi-trans- 

 parent luteous pits, forming a deep broad groove pelucidula. 



Median teeth farther apart than the median and outer teeth ; outer 

 teeth rather strong, about ten or twelve indistinct medium pits, not 



apparently semi-transparent Pattoni. 



As seen from the side the lateral margins of third segment are straight, or 

 slightly arched inwardly. 



Basin of face striate TCnusta. 



Basin of face punctured. 



Median teeth separated by a shallow, evenly curved areuation, farther apart 



than the median and outer teeth niti<lula. 



Teeth, and the emarginations between them, subequal, or with the median 

 teeth separated by a deeper rounded emargination and nearer together 



than the median and outer teeth ccemlans* 



As seen from the side the lateral margins of the third segment are sinuate, or 



arcuate, just before the outer apical teeth. 



Anterior margin of the groove containing the pits abrupt, forming a distinct 



swelling or declivity, and as seen from above the apical portion of 



segment with its lateral margins nearly parallel, very far within the 



overhanging margins of the groove inflata. 



Anterior margin of the groove rising only slightly above the pits, and as seen 

 from above the apical portion of segment with its lateral margins 

 connivent, nearly equal with the lateral margins of the basal portion. 



Nortoni. 

 As seen from the side the lateral margins of the third segment are arched out- 

 wardly, nearly straight just before the outer apical tooth. 



peracuta. 

 Prothorax as long, or longer than the head (plate x, fig. 89). 



Lateral margins of the third segment straight tripartita. 



Lateral margins of third segment bisinuate. 



Teeth tolerably long and slender, pointed, the median much longer than the 



outer propria. 



Teeth short, rounded at the apices, subequal lanta. 



TRANS. AMBB. KNT. SOO. XII. (34) NOVEUBER, 1885. 



