280 U. S. NATIONAL MUSEUM BULLETIN 216 part 3 



Front wing light brown with indefinite darker brown bands; temple just 

 below its midheight moderately convex; third and fourth tergites black 

 at base 14. resolutus (Cresson), in part 



5. Front part of submetapleural carina very high, about 2.5 as high anteriorly 



as near its hind end; punctures on lateral lobe of mesoscutum rather sparse, 

 separated usually by about 1.5 their diameter; clypeus a little wider than 



usual 14. resolutus (Cresson), in part 



Front part of submetapleural carina moderately high, about 1.5 as high 

 anteriorly as near its hind end; punctures on lateral lobe of mesoscutum 

 rather dense or sometimes rather sparse 6 



6. Second tergite with its basal 0.25 ± black 7 



Second tergite uniformly ferruginous or fulvous 8 



7. Front wing strongly banded with brownish yellow and dark brown; propodeum 



with basal transverse carina present but sometimes indistinct. 



6. crotchii (Cresson) 



Front wing weakly banded with brownish yellow and pale brown ; propodeum 



without basal transverse carina 9. tricinctus, new species 



8. Front wing brown, either uniformly brown or indistinctly banded .... 9 

 Front wing orange-yellow, strongh'' banded with dark brown. (Differenti- 

 ating characters for males of the following species are not entirelj' reliable. 

 Accurate determinations will depend on associations with females, consid- 

 eration of geographic distribution, and the use of caution, as well as appli- 

 cation of the key characters.) 11 



9. Basal 0.2 ± of stigma fulvous brown, the rest blackish; third tergite not 



fuscous at ba.se; basal transverse carina of propodeum indistinct; apical 

 transverse carina of propodeum moderately strong, interrupted medially. 



10. imicolor, new species 

 Basal 0.6 ± of stigma fulvous brown, the rest broAvn; third tergite usually 

 with a pair of transverse fuscous marks at base; basal transverse carina of 

 propodeum absent; apical transverse carina of propodeum absent or repre- 

 sented suVjlaterally by a weak vestige 10 



10. Punctures on mesopleurum and metapleurum dense, separated by about 0.3 



the diameter of the punctures; metapleurum usually black, sometimes 

 fulvoferruginous margined with black .... 11. turbatus (Cresson) 

 Punctures on mesopleurum and metapleurum moderately dense, separated 

 by about 0.5 the diameter of the punctures; metapleurum usually fulvo- 

 ferruginous margined with black, sometimes mostly black. 



12. fletcheri (Provancher) 



11. Front wing with a narrow premedian and a broad apical brown band (fig.362), 



the apical brown band often containing a yellow spot; hind femur and 



third tergite entirely fulvous 5. apicalis, new species 



Front wing with a premedian, a subapical, and an apical brown band (figs. 

 358-361, and 364), the subapical and apical brown bands confluent poste- 

 riorly and only rarely the yellow area between them small, to give an ap- 

 pearance as in C. apicalis; hind femur often infuscate apicaUy; third ter- 

 gite often fuscous at base 12 



12. Fourth tergite black at base; punctures on mesopleurum rather crowded; 



basal segment of fiagellum entirely fulvous; hind femur entirely ferruginous 

 or with a weak apical infuscation; range: east of Rocky Mountains. 



2. texensis, new species 



Fourth tergite not or rarely black at base; punctures on mesopleurum less 



crowded; basal segment of fiagellum often fuscous above; hind femur often 



