206 WILLIAM T. M. FORBES 



described. The group as a whole, however, is such a difficult one and so many 

 of the species are similar, that accurate determinations can be made only by one 

 who has a large collection available and has had considerable experience with 

 the group. As it is, even he can not always be sure of his species unless he has 

 both larval case and food plant records as well as the adult. No one should think 

 of describing new Coleophora except from bred specimens carefully determined. 

 To describe from collected adult material alone is nothing short of a crime, as it 

 can only add to the inconvenience and confusion of future workers. 



Key to the species 



1. Antenna with basal joint simple, rough scaled, or with only slight tuft, never 



with large projecting tuft; fore wing never pure white unmarked by longi- 

 tudinal lines 2 



Antenna with large projecting tuft on basal joint; or, if tuft is absent or much 

 reduced, fore wing snow white unmarked by longitudinal lines 42 



2. Fore wing metallic or gray brown, unicolorous, sometimes tinged with ochreous 



or darker shades at apex but never striped or otherwise marked 3 



Fore wing otherwise 12 



3. Fore wing dark gray to grayish brown, semi-lustrous 4 



Fore wing with shining, irridescent, metallic luster 10 



4. Apex of fore wing distinctly tinged with grayish ochreous 



( 1 ) cerasivorella. ( 2 ) zelleriella. 

 Apex of fore wing not distinctly tinged with grayish ochreous 5 



5. Head with decided ochreous tinge (3) occidentis. (4) fletcherella. 



Head gray or grayish brown 6 



6. Entire insect shining steel gray ( 5 ) laricella. 



Entire insect gray-brown or drab 7 



7. Fore wing somewhat paler than hind wing towards apex ( 8 ) coiicolorella. 



Fore wing concolorous with, or somewhat darker than, hind wing towards 



apex 8 



8. Legs and underside of moth with pale dustings grayish and largely obscured by 



dark scaling ( 6 ) unicolorella. 



Legs and underside of moth with pale dustings white and conspicuously pre- 

 dominating over darker scaling 9 



9. Fore and hind wing a uniform, dark, smoky gray-brown ( 7 ) pruniella. 



Fore and hind wing rather pale gray-brown. . . (9) cinerella. 



10. Antenna simple, thickened at base only (10) cenusella. 



Antenna clothed with rough scales for y 2 or more 11 



11. Antenna with rough scaling to ^; annulated beyond (11) coruscipennella. 



Antenna w r ith rough scaling to %; apical % silver white (12) apicialbella. 



12. Fore wing yellow to dark brown, more or less streaked with white 13 



Fore wing white streaked with yellowish white (or yellowish white streaked 



with white) 28 



13. Fore wing golden to dark brown; costa white; otherwise unmarked 14 



Fore wing yellow unicolorous; or yellow with white costal and dorsal margins; 



or ochreous fuscous with the veins outlined in white; or brownish with two 

 or more white stripes 22 



14. Fore wing dull blackish brown 15 



Fore wing drab brown to golden brown 16 



15. Antenna annulated ( 13 ) rosacella. 



Antenna not annulated ( 14 ) albiantenncella. 



16. Fore wing very dark (blackish brown) toward apex 17 



Fore wing nearly uniform golden brown, scarcely darker towards apex 18 



