NORTH AMERICAN DIGGER WASPS— FERNALD. • 401 



its margin following the outer edge of the dorsum about half way 

 from the fovea to the stigma, then obliijuely l)ackward to the lower 

 part of the side of the petiole, thus leaving a black stri}) ])etween it 

 and the stigmatal groove; the entire dorsum, sides and end of the 

 median segment bearing thickly set, long, yellow hairs, longei- behind; 

 these hairs are sometimes quite pale, giving a dull yellow color to this 

 portion of the body; prosternum golden sericeous in front of the 

 anterior coxie, and with long, yellow hairs; mesoi)leuron with an 

 irregularly vertical l)and of golden pubescence just l)ehind the pro- 

 thoracic lobe, which bends forward above toward the front end of the 

 mesonotal band; metapleural lol)e golden pubescent, as is also a spot 

 just above and in front of the mesocoxa; al)ove the hind coxa, below 

 the stigmatal groove, is a similar, more elongated spot, more or less 

 continuous, with a pubescent band extending downward along the 

 groove (often on both sides of it) from the stigma and forward to the 

 anterior end of the median segment; petiole short, straight, black, 

 about two-thirds as long as the second hind tarsal segment or the tii'st 

 segment of the lilament; with numerous short, yellow hairs and a 

 tendency toward pubescence. 



Ahdomen. — First two segments ])lack, the third more or less so; the 

 remainder black; above, sericeous, more noticeable anteriorI3^ smooth, 

 more or less varied with darker; last four segments punctured, the 

 first very faintly and sparsely, the punctures becoming more pro- 

 nounced and closer on the more posterior plates; there is a median, 

 triangular area on each of these plates except the last, not encroached 

 upon by the punctures; the last three plates bear a few brownish hairs, 

 chiefl}' at the sides, and quite long on the last two; beneath, colored as 

 above; surface glistening, not sericeous, the plates with scattered, 

 rather coarse punctures and scattered ferruginous hairs, almost 

 entirely lacking along the median line except on the terminal plate; 

 the hairs show a tendency to form a row on each plate parallel to and 

 a little in front of the posterior margin, except on the last plate. 



Whigt^. — Yellowish hyaline, particularly toward the base, becoming 

 fuliginous on the outer borders; in some cases the fuliginous is strong 

 and quite generall}' distributed, and then there is a violet reflection; 

 second and third transverse cubital veins of the fore wing not near 

 each other on the radial vein but nearer than on the cubital; trans- 

 verse median vein of the hind wing somewhat arched, making at least 

 a right angle with the median vein; discoidal vein almost interstitial; 

 cubital vein bending backward somewhat near its middle, well devel- 

 oped be3"ond the transverse cubital; teguhe pale ferruginous, sparsely 

 punctured, with traces of golden pul)escence in the center in some 

 cases. (Plate VII, %. 7.) 



Legx. — Coxte and basal portion of the trochanters Ijlack, the propor- 

 tion in the latter segment var3ano-; coxse sericeous, with numerous 



