40 



2 J Expanse of wings less than 21 mm., -,'... . fishii. 

 \ Expanse of wings more than 21 mm., . . . . . 3. 



3 ^ Expanse of wings between 23 and 25 mm., . . . elliottii. 

 \ Expanse of wings more than 25 mm., . . . homodactylus. 

 J Costa of first lobe of fore wing indistinctly brownish, stramineus. 

 ( Costa of first lobe of fore wing not marked with brown, angustus. 



g J Expanse of wings 24 mm., helianthi. 



\ Expanse of wings 28 mm., subochraceus . 



,* { Fore wings with a brown spot at the end of the fissure, . 7. 



f Fore wings unspotted, inconditus. 



J Fore wings sprinkled with black scales, . . mathewianus. 



\ Fore wings not sprinkled with black scales, . . paleaceus. 



/- With three or four terminal brown spots on outer margin of 

 8 < second lobe, kellicottii. 



(.Without this character, 9. 



J Pale ochre yellow without any markings, . . . grandis. 



} With more or less markings, 10. 



f An oblique reddish brown shade from costa to fissural spot, 

 10. < cretidactylus. 



C Without this character, 11. 



J Second lobe of a lighter color than the rest of the wing, baroni. 



) Without this character, 12. 



19 ^ A brown costal streak over the end of fissure, . . . 13. 



} Without this character, guttatus. 



-0 J Expanse of wings 28 mm., cineraceus. 



( Expanse of wings 22 mm., gratiosus. 



- . J With tuft of scales near middle of hind tibiae, . monodactylus. 



\ Without this character, . . 15. 



., ^ Expanse of wings less than 20 mm., . . . . .16. 



\ Expanse of wings more than 20 mm., 17. 



lfi J Costa of first lobe with two dark brown spots, . inquinatus. 



\ Costa of first lobe without two dark brown spots, . . parvus. 



.. J Costal region light yellowish brown, .... eupatorii. 



\ Costal region dark, . . . . . . . .18. 



1 ,, $ Outer fourth of costa mostly white, .... grisescens. 



) Outer fourth of costa with but little white, . . . lugubris. 



PTEROPHORUS FISHII. 

 Alucita fishii Fern., Can. Ent., Vol., XXV., p. 95 (1893). 



Expanse of wings, 20 mm. Thorax and abdomen white. Legs 

 white slightly tinged with brownish. 



Fore wings white with a few brown scales scattered over the 

 costal portion before the fissure, forming a faint costal triangu- 

 lar patch, beyond which are two equidistant brown spots on the 

 costa. Fringes pure white. Hind wings and fringes pure white. 

 Described from one specimen with the head wanting. 



Habitat. Nevada. Early stages and food plant unknown. 



