ARPHIA. 123 



ff. Smaller : the wing-band rather broad and of equal 



width throughout; taenia broader and extending 



two-thirds of the distance towards the base. 



g. Disc of the wing straw- or clay-yellow. Size 



smaller : pronotum moderately rugose. (Mexico 



southward.) 25. decepta, sp. n. 



gg. Disc of the wing lemon-yellow. Size larger : pro- 

 notum less strongly rugose, sometimes nearly 

 smooth. (Texas and northward.) . . . . . 26. simplex, Scudd. 

 ee. Disc of the wing yellowish-orange or vermilion, the apex 

 fuscous, with or without a prseapical paler area. 

 /. Wings with the disc yellowish-orange, the apex in- 



fuscated ; face somewhat sloping. (Texas.) . . . [27. infernalis, Sauss.] 

 ff. Wings with the disc vermilion, the apex sometimes with 

 an ante-apical pale band. Face vertical. (Mexico 



southward.) 11. nietana, Sauss., $. 



bb. Frontal costa convergent above, acuminate at the vertex. 



c. Larger : tegmina and wings long, the latter with the disc 



orange-ochraceous 28. ramona, Rehn. 



cc. Smaller : tegmina and wings more abbreviated, the latter 



generally yellow. 



d. Wings with the coloured area of the costal field rather 



broad; the taenia narrow; dusky band rather narrow, 



and slightly interrupted at the veins, pale orange or 



chrome-yellow [29. koebelei, sp. n.] 



dd. Wings with the coloured area of the costal field usually 

 much narrowed, sometimes almost wanting; the dusky 

 band more conspicuous. 

 e. Foveolse of the vertex longer than wide, even in the ? ; 

 the two sexes very unequal in size. (California and 

 northward.) 

 /. Smaller: the pronotum not noticeably broadening 

 behind ; dorsal edges of the tegmina usually pale- 

 coloured, even in the ? ; apex of wings subhyaline. [30. frigida, Scudd.] 

 //. Larger : the pronotum conspicuously widening be- 

 hind; dorsal edge of the tegmina not light-coloured, 

 even in the <?; apex of wings fuliginous . . . .31. behrensi, Sauss. 

 ee. Foveolse of the vertex broader than long, even in the $ . 

 The two sexes not very unequal in size. (Northward 

 and eastward.) [32. sulphured, Fahr.] 



Rr2 



