March, 1896.] FoX, NORTH AMERICAN SpECIES OF NVSSON. 11 



Pygidial area narrower, rounded at tip, longitudinally rugoso-punctate ; lateral 

 spots of first dorsal segment confined to apical portion of the segment, 

 transverse squalls 



8. Clypeus bituberculate at apex ; punctuation of the head and thorax very coarse, 



almost rugose (medial and hind femora more or less red) . . . .compactus. 

 Clypeus not tuberculate ; punctuation strong, but rather close and not rugose. 9 



9. Abdomen not at all red 10 



Abdomen with the two basal segments more or less reddish (punctuation of head 



and thorax very close, appearing granular ; punctuation of abdomen subtile). 



rusticus. 



10. Punctuation of head and dorsulum distinctly separated, that of the abdomen 



strong and very distinct . lateralis.—" 



Punctuation of head and dorsulum, particularly the former, very close, that of 

 abdomen rather subtile, most distinct on first segment fidells. 



1 1. Scutellum distinctly margined laterally 12 



Scutellum not margined laterally 15 



1 2. Abdomen not at all reddish I3 



Abdomen reddish basally 14 



13. Basal enclosure of middle-segment with coarse, irregular ridges, thereby mak- 



ing the enclosure reticulate ; abdominal punctures strong, but not very deep. 



opulentus. ^ 

 Basal enclosure of middle-segment with the ridges regular, longitudinal on 

 basal two-thirds, then oblique; abdominal punctures deep melllpes. 



14. Scutellum coariely rugoso-punctate ; wings clear; a yellow line on pronotum 



and scutellum bellus. 



Scutellum with coarse, longitudinal folds ; wings subfuscous; no yellow on pro- 

 notum or scutellum (punctuation of head and dorsulum unusually coarse). 



basilarls. 



15. Black, with pale markings; a divided tubercle between the ocelli; punctuation 



of head and thorax strong and separated albomarginatus." " 



Black, with abdomen red; space between ocelli not tuberculate ; punctuation of 

 head and thorax very close and rather fine bicolor. 



Males. 



Hind tibise more or less serrated ; last dorsal segment 4 dentate 2 



Hind tibiae not serrated ; last dorsal bidentate 3 



2. Legs red texanus. 



Legs black f uscipes. 



3. Second ventral segment truncate at base, viewed from the side almost forming a 



right angle spinosus. 



Second ventral segment otherwise formed 4 



4. Submedian cell (anal area) terminating beyond or at the origin of the cubital 



vein 5 



Submedian cell terminating before the origin of the cubital vein 13 



5. Last dorsal segment ciliated between the teeth 6 



Last dorsal segment not ciliated between the teeth 7 



