NORTH AMERICAN" LASPEYRESIINAE AND OLETHREUTINAE 131 



t ures are concerned and they show the characters — such as they are — 

 separating the various species; but they were not made to any uni- 

 (orm scale and the differences in size are not significant. 



KEY TO THB SPECIES OF EX.VBTEMA 



1. Dark pattern markings of fore wing much broken by rather large spots of 



the pale ground color, giving wing a mottled appearance. 



(1) monetiferanum. 

 Fore wing otherwise 2. 



2. Fore wing ashy-gray- white with a red-brown basal patch and a large red- 



brown quadrate spot upon midcosta, the latter fusing with subapical bar. 



(48) ferriferanum. 

 Fore wing otherwise 3. 



3. Hind wing markedly whitish toward base 4. 



Hind wing uniformly dark or pale smoky fuscous ; at most only faintly 



whitish toward base 5. 



4. Fore wing cinnamon-brown (19) bicoloranum. 



(39) submissanum. 



Fore wing blackish fuscous (20) tenebricum. 



ft. Fore wing with median vertical band more or less obliterated by a central 

 longitudinal pale suffusion ; or with a blackish suffusion covering basal 



four-fifths of wing 6. 



Fore wing with median vertical band defined ; usually well contrasted 

 against both antemedian and postmedian paler areas ; if sometimes poorly 

 defined upon inner margin due to dark dusting in antemedian area, al- 

 ways at least somewhat contrasted against postmedian pale markings- 18. 



6. Fore wing with a blackish suffusion covering basal four-fifths ; outer fifth 



whitish, whitish ocherous or ocherous, except for blackish subapical bar. 



(44) concinnanum terminanum. 

 Fore wing not so marked 7. 



7. Fore wing snowy white somewhat spotted and dusted with black or blackish 



fuscous toward lower inner angle, on outer half of costa, and toward 



termen and apex (41) malanum. 



Fore wing more or less marked with dark patches and sometimes with 

 considerable suffusion of whitish ocherous on disk ; but never with 

 pale areas snowy white 8. 



8. Fore wing with a purplish fuscous or dark graj'ish fuscous blotch (con- 



sisting of a fusion of basal patch, dorsal portion of median band and, 



often, subtornal spot) covering most of dorsum nearly to tornus 9. 



Fore wing more or less dark shaded or spotted ; but never with a strongly 

 contrasted dark blotch continuous from base and reaching beyond 

 middle of dorsum 10. 



9. Dark patcli on dorsum of fore wing extending to but not including subtornal 



spot or (where latter is absent) the area usually occupied by same; male 

 genitalia with spined digitus projecting from neck of harpe near sacculus. 



(16) clavanum. 



Dark patch on dorsum extending to tornus, including subtornal spot ; male 



genitalia with spined digitus projecting from neck of harpe near cucullus. 



(25) nigranum (part). 



10. Subapical bar and preternal spot of fore wing both obsolete 11. 



One or both of the above marks always present and definitely outlined, 

 though sometimes faintly colored 12. 



54346—26 10 



