NO. 1487. NORTH AMERICAN DIGGER WASPS— FERNALD. 339 



the sides, slightly black sericeous in the middle, and with a few rather 

 short black hairs; median suture developed, with a noticeable, large 

 puncture near its middle; an oblique suture outside the ocelli joins the 

 frontal suture with a transverse one behind and continuing backward, 

 ends at a faint puncture bearing a macrocha?ta; vertex and cheeks 

 miiuitel}', closely punctured, sericeous, almost glistening, almost with- 

 out coarser punctures and hairs except along the border of the occiput 

 and low down on the cheeks, where both become quite abundant; top 

 of the vertex located behind the posterior edge of the eyes; cheeks 

 quite roljust, in their widest place wider, than half the width of the 

 eye; antenna? black, the filament slightly olive sericeous in some lights; 

 scape with a few scattered punctures and hairs, particularly on the 

 inner side near the tip; pedicel short, black; first segment of the fila- 

 ment longest; relative lengths of filament segments ^V^t^m^^ts? man- 

 dibles stout, blackish at base, tinged with ferruginous near the ])ascs of 

 the teeth and peripherally, varying in amount; with numerous longi- 

 tudinal grooves and three teeth, the anterior one smallest and close to 

 the median one; with a fringe of long black hairs behind and another 

 ill front. 



Thorax. — Collar with its front and hind faces nearly vertical, the 

 latter quite closely appressed against the mesonotum; lower part of 

 the anterior face smooth, glistening; above this slightly blackish seri- 

 ceous, with close, minute punctures and more scattered ones and often 

 with a few^ fine, transverse aciculations; this portion and the dorsal 

 edge sometimes thinly whitish pubescent and bearing black hairs; sides 

 of the collar in front of the prothoracic lobe with fine oblique acicu- 

 lations except on a small round hump in front of the upper edge of 

 the lobe, which is smooth; prothoracic lobe with a continuation onto 

 its upper part of the aciculations from in front; smooth below, with a 

 few long black hairs and with a dense fringe of short brown hairs on 

 its posterior edge; prosternum with a strongl}' developed median 

 groove, coarsely punctured, and bearing numerous, quite long, black 

 hairs; mesonotum with a median impressed line extending the entire 

 length of the plate, widest, and with faint edges anteriorl}^; the sur- 

 face of the plate blackish sericeous with close, minute punctures and 

 a few scattered, coarser ones and short, black hairs; lateral margin 

 somewhat reflexed from in front of the tegula?, where there is a trace 

 of aciculation, backward and then inward to where the scutellum rises 

 to its level; scutellum high, rounded, sometimes slightlj^ constricted in 

 the middle in front and behind, giving it a slight dumb-bell shaped 

 outline, its sides and anterior angles slightly aciculate; postscutellum 

 blackish sericeous, dull; median .segment dorsum dull black, trans- 

 versely aciculate, with a shallow, median depression and numerous 

 short, 'llaek hairs; with no pronounced suture or other mark between 

 the stigma and fovea, which latter is circular in outline; from the fovea 



