612 PROCEEDINGS OF THE ACADEMY OF [Aug., 



men, though distinct, are merely little semilunar (l(>pressions. Head 

 broad, facial quadrangle broader than long; scape and face with black 

 bristles; cheeks entirely black, covered with grayish hair; mandibles 

 except tips, labrum (which has a slight tubercle), clypeus except upper 

 part, and a transverse flame-like mark coming from the lowest part 

 of anterior orbital margin, yellowish-ferruginous; a minute red spot 

 at the summit of each eye; antennte rather long, third joint shorter 

 than fourth; flagellum thick, dark reddish (the first joint brighter), as 

 also is the scape; thorax rather alxmdantly clothed with dull grayish 

 hair; mesothorax entirely black, extremely closely punctured; meta- 

 thorax black, with two small yellow spots on the enclosure; scutellum 

 with two large oval yellow spots; postscutellum black; pleura black; 

 upper edge of prothorax, tu]:>crcles and tcgulae yellow; wings dusky, 

 but not extremely dark, stigma and nervures rufo-f uscous ; second sub- 

 marginal cell broad above; third very broad below, its outer margin 

 angled; basal nervure a short distance basad of transverso-medial ; 

 femora black, red at apex; tibiae and tarsi red, the tibise more or less 

 marked with yellow; abdomen black, with a liroadly interrupted yel- 

 low band on first segment, a broad yellow band, not quite interru])te(l, 

 on second, narrowly interrupted bands (more or less notched behind 

 sublaterally) on third and fourth, and a large patch and lateral spots 

 on fifth; pygidial plate very broadly rounded at end; venter black 

 stained with red, especially on the second segment. 



Hab. — Riverton, N. J., April 22 (Viereck). Mr. Viereck finds that 

 the following Cressonian species have, like A'', sphcerogaster, the basal 

 nervure a short distance basad of the transverso-medial, and the third 

 antennal joint shorter than the fourth: accepta, proxima, vicina, 

 fragUis, dilucida, libata, paraia, crotchii and crudelis. 

 Nomada electella, sp. n. 



9 . — Length about 7 mm., proportions ordinary; black, yellow and 

 red. Head and thorax bare, extremely coarsely rugose; head black, 

 with the clypeus, supraclypeal mark, rounded lateral face-marks not 

 going above level of clypeus, labrum (which has a strong reddish spine), 

 mandibles except tips, and a minute dot at the summit of each eye, 

 yellow stained with ferruginous; antennae rather long, first three joints 

 rufous, the others dark reddish-brown, third joint very much shorter 

 than fourth; thorax black, the upper margin of prothorax, prominent 

 tubercles, scutellum and broad transverse band on pleura, yellow, the 

 last tinged with red; tegulce testaceous with a yellow spot; wings 

 dusky, stigma and nervures fuscous ; second- sul^marginal cell small 

 and narrow, narrowed almost to a point above; third broad below, its 



