264 WILLIAM T. M. FORBES 



13. Second segment of palpus powdery gray; tuft in 

 fold blackish, preceded by a few yellow scales 

 at most; wing with strong contrasts. 

 14. Moth whitish, the markings formed of black pow- 

 dering on a white base, without any gray; a 

 distinct, outwardly oblique median fascia. 



17. lynceella. 

 14. More or less gray or fuscous scaling; the effect 



less whitish. 

 15. Scutellum contrasting, light yellow. 



19. macuUmarginella. 

 15. Scutellum concolorous, powdery gray. 



18. bicostomaculella. 



13. Second segment of palpus and whole wing nearly 

 evenly powdered black on blue gray. 



15. inquilvnella. 

 13. Second segment of palpus contrasting, yellowish 



white 20. vernella,. 



9. Fuscous, nearly even or obscurely dusted and shaded. 



10. A heavy but irregular black antemedial bar. .21. dyariella. 

 10. No such marking. 



11. Heaviest black spots are first discal dot (orbicular), 

 which is a bar, and antemedial dots on costa and in 



fold 24. gilvomaculella. 



11. Outer discal dot most strongly marked, or the discal 



spots obsolete. 

 12. Second segment of palpus deep black. 



13. Fore wing with indistinct white markings. 



14. albisparsella. 

 13. Fore wing with faint dark markings only. 



16. unctulella, rileyella. 

 12. Second segment of palpus powdery gray. 18 



11. fluvialella, etc. 



1. G. cercerisella Chambers. Velvety black; palpi, head, and collar white; third 

 segment of palpi white except at base; antennae dark. Fore wing with a few 

 ochreous scales, slightly bronzed; three costal spots, the first reaching fold, the 

 second and third on inner margin; and some white terminal points. Costal cilia 

 brown, dorsal white, with a brown line at base. Hind wing pale drab, faintly pink 

 tinged. 14 mm. 



Two or more broods. Moth from May to September. Caterpillar on Cercis 

 canadensis, spinning the leaves together: white, a broken black band on face and 

 a bowed one on vertex; posterior half of each segment above, and true legs black. 

 Young larva wholly white; sometimes living in a single folded leaf. 



Distribution general, north to central Illinois and Maryland. 



2. G. coloradensis Busck. Deep black; antennae black; second joint of palpi 

 white with dark scales above; third mostly black with white tip. Face white; 

 fore wing with an oblique antemedial costal streak reaching to fold, an elliptical 

 white spot on disc, an angulate costal spot at beginning of fringe, a dorsal spot 



J 8 G. fluvialella will run to the last alternative of the key if the darker veining, which 

 is often obscure, is not noted. Its large size and broad wings distinguish it from most 

 of the plain Gelechias. O. discoocellella will also run there, in the case of specimens that 

 have lost the black dot in the reniform. It may be distinguished by its purplish overcast 

 and pale, dot-like reniform. There are several other smallish species which have never 

 been worked out. 



