NO. 1487. NORTH AMERICAN DIGGER WASPS— FERNALD. 393 



roughened by the presence qf many small elevations; meso- and meta- 

 pleiira with long-, yellowish-white hairs; a spot behind the prothonicic 

 lot)e is pale yellowish pubescent, and there is a silver}^ pu])escent l)and 

 on the metapleuron from the hind coxte along the stigmatal groove; 

 the general surface of the mesopleuron is rather roughened; meso- 

 sternum quite thickly covered with long, yellowish hairs and some- 

 times partly pale yellowish pubescent; petiole short, straight, l>lack, 

 quite thickly clothed with long, pale yellow hairs, and with traces of 

 yellowish sericeous in some ca es. 



Ahdomen. — Black, sometimes more or less ferruginous; yellowish 

 'sericeous, particular!}^ anteriorl}"; above, the last four plates bear short, 

 dull yellow hairs pointing backward, most abundant at the sides in 

 front, but everywhere on the last plate; posterior margin of the last 

 plate rounded, with a slight notch or only an emargination in the 

 middle; beneath glistening, smooth, with a few scattered hairs, par- 

 ticularly at the sides, on the hinder plates; posterior margin of the 

 seventh plate forming a deep, broad notch, with a tuft of dark 

 yellowish hairs on each posterior angle and a short, nearl}' erect, 

 sharp-pointed spine in the middle near the base of the segment, often 

 concealed by the sixth plate, which may cover it from sight; terminal 

 plate triangular, rather narrow at the ])ase, forming a point behind, 

 from which a pronounced ridge runs forward in the middle of the 

 plate to its base. 



]V!n(js. — Hyaline, slightly fuliginous along their outer margins or 

 rarely somewhat fuliginous everywhere; with a noticea))le darker 

 shade be3"ond the end of the radial cell; cubital vein of the fore wing- 

 obsolete beyond the end of the third cubital cell; transverse median 

 vein of the hind wing quite straight, making more than a right angle 

 with the median; discoidal vein not intei'stitial; cubital vein with a 

 no ic?able backward bend near its middle, obsolete beyond the trans- 

 verse cubital vein; the radial runs but a short distance beyond this 

 point also; teguhe black with a ferruginous tinge behind, very faintly 

 sericeous in front, quite smooth. 



Legs. — Black, sometimes more or less ferruginous, the distribution 

 of the color lieing irregular; anterior coxiB yellowish pubescent in 

 front; all the cox» thickly covered with long, yellowish hair, thickest 

 and longest on the front pair; trochanters black, with more or less of 

 yellowish hairs; anterior and middle femora quite hairy, the posterior 

 pair smooth; tibiae and tarsi yellowish sericeous, the spines on the 

 anterior and middle pairs yellow, those on the posterior pair all or in 

 part Ijlack; claws black. 



Variations. — Diti'erences in the amount of ferruginous on the al)domen 

 and legs, and in the depth of color of the pubescence and hairs give 

 to different specimens of this species quite ditferent general appear- 



