NO. 1487. NORTH AMERICAN DIGGER WASPS— FERNALI). 347 



rehitive segment lengths ^V, 1%, t\? iS, A I mandible.s long, each 

 reaching to the base of the other; black with a ferruginous tinge near 

 the base of th.e teeth; 3-toothed, the anterior tooth the smallest. 



Thorax. — Black, with traces of pale j^ellow to silvery white pubes- 

 cence on the dorsal edge of the collar, sides of the mesonotum, middle 

 of the scutellum and postscutellum, and above and somewhat in front 

 of the middle and hind coxw and on the posterior end of the median 

 segment; (juite long gray hairs generally distributed; neck black seri- 

 ceous, as is also the anterior face of the collar except at the junction 

 with the neck, where there is a bare space showing faint transverse 

 rugosities; sides of collar less sericeous than the front; prothoracic 

 lobe with a faint trace of whitish pubescence; mesonotum black seri- 

 ceous except where pubescent, its sides and hinder end slightly 

 reflexed, with a perceptible median groove on the anterior half of the 

 plate; scutellum black sericeous except for a spot of silvery whitish 

 pubescence on its middle which is higher than the mesonotum; with 

 no perceptible median groove; postscutellum black sericeous, with a 

 faint pubescent spot in the middle (these pubescent spots are fre- 

 quently absent); median segment dull, velvety black sericeous above, 

 with quite numerous long, white or gra}" hairs; a slight broad hollow 

 is present in front of the fovea, which is small and circular in outline; 

 posterior end forming quite an angle with the dorsum, though less 

 than a right angle; its surface often with traces of silvery white pubes- 

 cence and with many long gra}' hairs; sides of the median segment 

 clothed with similar hairs; a groove runs nearl}^ horizontal!}" forward 

 from the posterior coxa?; above this on the sides of the median segment 

 are tine ridges running downward and somewhat forward and in part 

 continued across the groove onto the metapleura; mesopleura coarsel}' 

 vertically rugose below in front, these rugosities disappearing on the 

 hinder part, but with scattered punctures on both parts; a trace of 

 silvery white pubescence just above the mesocoxte; metapleura dull 

 black, sericeous, sometimes with a trace of a very short, silvery white 

 pubescent band just beneath the posterior end of the groove, between 

 the metapleura and the median segment; meso- and metapleura with 

 numerous long gray hairs; mesosternum with the rugosit}' from the 

 mesopleura continued onto it for a short distance; coarsely punctured 

 and with long gray hairs; petiole black, straight, with numerous long- 

 white or gray hairs, most abundant near its base; noticea])ly longer 

 than the second hind tarsal segment. 



Ahdomcn. — Dull ferruginous with darker shading, particularly on 

 the hinder dorsal plates; rising high l)ut not sharply above the petiole; 

 ovate; pointed rather more behind than in front; above, glistening, 

 with traces of white sericeous at some angles; hind edges of the dorsal 

 plates paler than the remainder; terminal plate rounded acuminate 

 behind, quite compressed laterally; bearing a few scattei'ed punctures; 



