110 ENTOMOLOGICAL SOCIETY 



Fore wings without cross lines. 



Wings long, size large (32mm.) metalicella Hulst 



Wings less elongate, size smaller (25 mm.). 



Iridescence coppery scintillans Grote 



Iridescence bronzy green ceneoviridella Ragonot 



Iridescence greenish yellow, sexes unlike (eneella Hulst 



Fore wings with transverse lines. 

 These lines pale. 



Lines white \ wings with metallic lustre bistriatella Hulst 



Lines grayish ; wings without metallic lustre. 



Dark fuscous beneath incorruscella Hulst 



Light yellowish fuscous beneath hanhamella Dyar 



These lines black rainierella Dyar 



Megasis caudellella, n. sp. 



$ gray, pulverulent, lines whitish, straight, the inner line very slightly 

 bent subcostally, the outer almost perfectly straight, both faintly blackish 

 edged toward the median field. Discal spot black, more or less distinct; 

 terminal line shaded black. Hind wings subpellucid pale gray, termen 

 blackish narrowly, fringe pale. Expanse 30-32 mm. 



9 much smaller and more distinctly marked. Lines whitish, diffuse, 

 nearly straight with broad distinct blackish borders within; discal dots 

 separated by a whitish point. Hind wings as in the male. Expanse 20- 

 22 mm. 



Two (^(j", two 99, foothills above Golden, Colorado, May 

 13, 1901 (Dyar and Caudell). 



Type. No. 7846, U. S. National Museum. 



Differs from the other species of Megasis of similar size in the 

 straightness of the lines. 



Megasis piperella, n. sp. 



Fore wings with n veins, hind wings with 8, 4 and 5 long stalked; 

 labial palpi moderate, drooping; maxillary, small, filiform. Male antenna- 

 simple; no lateral tuft on thorax. Fore wings elongate, narrow, apex 

 depressed; light ashy gray; a diffuse ochraceous ray through the cell. 

 Costa white on basal third, running to over half subcostally but not pure 

 white being mixed with scattered cinereous scales. Discal dots black, 

 separated by the end of the ocherous ray. Veins slightly powdered in 

 darker; lines absent. Hind wings moderately ample, subpellucid, pale 

 fuscous tinted. Below like hind wings above. Expanse 32 mm. 



One 3% Pullman, Washington, May 15, 1898 (C. V. Piper). 

 Washington Experiment Station No. 233. 



Type. No. 7847, U. S. National Museum. 



This may be Epischnia granitella Rag., but I place it in 

 Megasis in an effort to interpret Hulst's tables literally. 



The species of Megasis may be separated as follows : 



