468 AMERICAN HYMENOPTERA. 



the bases of the wings at the same time more or less dark, thus form- 

 ing an indefinite interalar band ; the mesopleura often yellow to the 

 bases of the legs. 



Abdomen. — Dorsum: segment one occasionally entirely dark and 

 often with yellow only on the sides, but usually covered with yellow 

 pile ; segment two dark ; segment three dark, with yellow pile on the 

 hind corners ; segment four yellow ; segments five and six black in the 

 middle and yellow on the sides ; segment seven black. Venter some- 

 times almost entirely dark, but usually with considerable yellow hair, 

 at least on the sides of the middle portion. 



Getiitalia. — Outer spatha (fig. 60) long for its width ; its anterior 

 margin broadly but deeply incurved, its side margins nearly straight 

 and converging posteriorly and its hind margin arcuate ; each anterior 

 lateral projection with a small pointed projection on its outer side near 

 the end ; ventral surface with a scattering tuft of very long hairs on 

 each side of the middle. Inner spatha long for its width (fig. 141), 

 its front margin projecting forward strongly and heavily chitinized in 

 the middle ; its side margins sharply incurved in front and outcurved 

 behind ; its hind margin curved forward somewhat in the middle, so as 

 to make the apex feebly bilobate ; the apical portion of the ventral sur- 

 face, except along the middle line, rather densely clothed with long, 

 branched hairs. Claspers (figs. 92 and 99) with branches slender and 

 rounded at the apex as seen from dorsal side ; each squama with its mar- 

 gin outcurved on its outer side and at its apex, but somewhat incurved 

 on the inner side of its apical portion so as to form a broadly rounded 

 outer lobe with a pointed inner projection ; each volsella more or less 

 pointed at its apex, its outer margin out-curved and its inner margin 

 usually somewhat out-curved behind the middle, but strongly incurved 

 in front. Sagittae much like those of suckleyi and variabilis, but char- 

 apterized by a very sharp indentation, in the outer side of each, between 

 the head and the shaft. 



Wings. — Usually somewhat lighter than those of the female; sub- 

 hyaline. 



Legs. — Mostly dark. 



Dimensions . — Length : female, 13 mm. to 18 mm. , male, 11 mm. 

 to 16j mm. Spread of wings : female, 30 mm. to 39 mm. ; male, 28 

 mm. to 35 mm. Width of abdomen at second segment: female, 7 

 mm. to 10 mm. ; male, 6 mm. to 1\ mm. 



Redescribed from several females and many males. 



Habitat. — I have records of this species as follows : Canada 

 (Ontario ; Meach Lake, Montreal and Maisonneuve in Que- 

 bec ; Hampton on Prince Edward Island ; a small male 

 from Regina, Province of Saskatchewan), Maine (Waldo- 

 boro and Brunswick), New Hampshire (Conway, Durham 



