120 OETHOPTEEA. 



acute-angled behind. Taenia or basally directed part of the 

 fuscous area of the wings short. 

 c. Lateral foveolae of the vertex elongate-triangular. Pronotum 

 finely granulate, the dorsal impressions obsolete, the crest 

 strongly arcuate. 

 d. Frontal costa without a carina, plane. Pronotum arcuately 

 cristate. Wings yellow-orange basally, widely dusky- 

 banded [1. carinata, Scudd.] 



dd. Frontal costa carinate above. Pronotal crest straight in 

 front, arcuate behind. Wings with the disc brick-red, or 



variable, very broadly black-banded 2. crepusculum, Sauss. 



cc. Lateral foveolse of the vertex four-sided. Pronotum rugose, 



the dorsal impressions more distinct and the crest less 



arcuate. 



d. Lateral foveolse smaller, with their apices obliquely truncate 



or arcuately acuminate. (United States east of the 



Mississippi River.) [3. xanthoptera, Germ.] 



dd. Lateral foveolee usually large, fully as high as long, the 



inner upper angle rounded. (N. Mexico.) 4. difficilis, sp. n. 



bb. Pronotal crest less strongly elevated, straight or nearly so. Pro- 

 notum obtuse, or only gently angulate in front. Taenia of the 

 wings more elongated. 

 c. Median carina of pronotum not severed by the principal sulcus. 



(Florida.) [5, granulata, Sauss.] 



cc. Median carina of the pronotum severed by the principal 

 sulcus. 

 d. Disc of the wings yellow or orange. 



e. Posterior edge of the pronotal disc (at least in the ? ) 

 obtuse-angled. Disc of the wings dull brownish-yellow, 

 the taenia very broad and occupying nearly the whole of 



the anterior field 6. fallaw, Sauss. 



ee. Posterior edge of the pronotal disc acute-angled in both 



sexes. Disc of wings orange, the taenia much narrower. 



/. Fuliginous band of the wings narrow, not quite reaching 



the front edge and only slightly produced towards the 



anal angle 7. truculenta, Rehn. 



//. Fuliginous hand of the wings rather broad, reaching the 

 anterior edge and following well towards the anal 



angle * -• ■ 8. aurantipennis, sp. n. 



dd. Disc of the wings vermilion or carmine. 



c. Size small : body rather slender [9. saussureana, Bruner.] 



ee. Size larger : body usually somewhat robust. 



/. Wing-bands rather narrow, not extending more than 

 halfway along the outer border towards the anal angle. 



