NO. 1487. NORTH AMERICAN DIGGER WASPS— FERN ALD. 323 



longest, somewhat grayish sericeous but less so than the remainder of 

 the filament; second and third filament segments nearly equal in 

 length, fourth and fifth shorter, nearly equal; mandibles black, some- 

 what tinged with ferruginous near the base of the two teeth; bearing 

 a few black hairs on the posterior face near the base. 



Thorax. — Collar robust, its posterior face v^ertical, evenly sloping in 

 front, quite broad from front to rear over its crest, which is evenly 

 rounded from side to side; its surface toward the crest brownish seri- 

 ceous; surface closely, minutely punctured and also with numerous 

 somewhat coarser punctures and rather short hairs; its side in front 

 of the prothoracic lobe ver}^ finely aciculate, the grooves running 

 obliquely forward and downward; prothoracic lobe with small, scat- 

 tered punctures and rather long hairs; with a dense fringe of short, 

 pale-brown hairs on the hinder border: mesonotum dark-brown seri- 

 ceous; closely, minutely punctured and with a few somewhat coarser 

 punctures and scattered, short, black hairs; with a narrow median 

 groove extending nearly half wa}" back, with distinct edges, the groove 

 being a little wider anteriorly; lateral margin retlexed slightly from 

 near the prothoracic lobe up around the tegula and backward to the 

 posterior margin, then inward till the scutellum rises to its level; 

 scutellum higher in its middle than the mesonotum, rounded, with a 

 distinct median groove; its surface closely, minutely punctured and 

 with a few somewhat coarser punctures and a few short, fine hairs; 

 postscutellum without median groove, finely, rather irregularly, 

 transversely aciculate and with rather short hairs; dorsum of median 

 segment finely, transversely aciculate, coarsest anteriorly, closely cov- 

 ered with very short, erect hairs; end of dorsum rounding to a rather 

 blunt point at the fovea, which is small and subtriangular; a median 

 shallow depression is present along the dorsum; hinder end and sides 

 of the median segment rather finely aciculate, the grooves at the sides 

 running obliquely downward and forward and continuing onto the 

 nietapleura; stigmatal groove absent; mesopleura rather more coarsely 

 aciculate beneath the tegula) than elsewhere, the grooves nearly hori- 

 zontal; Ijehind the prothoracic lobe more finely aciculate, the grooves 

 running upward and backward; remainder to the middle coxie closely, 

 minutely punctured and with numerous rather coarse punctures and 

 long hairs; metapleura obliquely aciculate everywhere except around 

 the stigma, coarsest beneath the base of the hind wing; with numerous 

 quite coarse punctures and long black hairs; mesosternum with a 

 median groove; with numerous rather coarse punctures and long 

 hairs; petiole black, slightly curved, about the length of the posterior 

 coxffi, bearing many short, black hairs. 



Abdo)iien. — First two segments ferruginous, the third slightly so on 

 the sides and behind, above; remaindei- black; above; first segment 

 rising quite sharply from the petiole, high; its stigma behind the 



