6 HYMENOPTERA OF AMERICA. [VART I. 



thorax; 1st joint short and thick, 3d to Gth about equal, some- 

 wliat flat; 7th shorter, the 5 apical joints soldered into a broad 

 oval knob, slightly concave beneath ; the sutures somewhat 

 distinct beneath. Metathorax forming on each side a somewhat 

 flattened square angle, armed with an acute spine. Anterior 

 femora rather curved and tibiae dilated ; posterior tibiae armed 

 with two spurs, one of which is elongate and deeply bifid. Tarsal 

 claws simple. Abdomen elongate, convex above, gradually 

 narrowed posteriorly ; apical segment subquadrate, deeply emar- 

 ginate at the apex, with two longitudinal carina?, each bearing a 

 small obtuse tubercle on the posterior third of the segment ; 2d 

 and 3d segments beneath with a bifid projection at their base ; 

 that of the 3d very prominent and armed posteriorly with an 

 acute spine. 



Body black ; clypeus, apex of the labrum, middle of the mandi- 

 bles, a transverse dilated line between the antenna? and the inner 

 and outer orbit of the eyes above the antenna?, yellow; antenna? 

 above, with the base of the first and second joints black ; the 

 apex of 1st, inner side of 2d, and the 4 following joints, yellow; 

 the apical joints yelloVish, varied with fuscous, blackish beneath. 

 Anterior margin of prothorax, a spot beneath the wings, wing 

 scales and a spot above, apex of scutellum and angles of meta- 

 thorax yellow. Legs yellow, at base black. Each segment of 

 the abdomen above with a submarginal yellow indented band ; 

 apical segment with a quadrilobed yellow spot. Wings stained 

 with yellowish, nervures honey j'ellow about the base, fuscous 

 toward the apex. 



Female. — Form shorter. Clypeus widely and deeply emar- 

 ginate, very coarsely punctured, roughly folded and reticulate at 

 the top. Labrum carinated, elongated and rounded at tip. 

 Forehead carinated transversely between the antenna?. Head 

 and thorax densely, metathorax finely punctured ; scutellum 

 polished. Mesothorax carinated. The thorax depressed ; the 

 angles of metathorax flattened and depressed, terminating in an 

 acute spine. Abdomen finely punctured ; the segments very 

 little constricted at base. First joint of the anterior tarsi rather 

 dilated. 



Black, with fulvous pubescence. Antenna? fulvous; the 1st 

 and 2d joints blackish, the 1st yellow at tip; the club obscure 

 on the upper side, blackish at tip. Palpi, the middle of mandi- 



