168 WILLIAM T. M. FORBES 



11. P. quadripunctella Clemens. Face fuscous; tuft dark brown; fore wing with 

 inner margin contrastingly whitish. 8 mm. 



Larva on apple and chokecherry. 

 Eastern States to Kansas. 



12. P. vicinella Dietz. Dark brown with a purplish tint, with dark and obscure 

 markings. 7 mm. 



Larva on yellow birch. 

 Pennsylvania. 



13. P. sorbivorella Dietz. Grayish brown; occiput and thorax creamy white; 

 markings mostly weak; plical spots black, contracting; a white discal bar. 10 mm. 

 (strobirorella Dietz, misprint.) 



Larva in a cone like Gracilaria, on mountain ash. 

 Pennsylvania. 



14. P. arbutifoliella Dietz. Gray with brown costa; inner margin mostly white, 

 with triangular black spots in fold. Head and thorax white. 9 mm. 



Larva on Pyrus arbutifolia ( chokeberry ) . 

 Pennsylvania. 



15. P. obliterella Dietz. Purple-brown; fourth and fifth striae widely separate; 

 inner third of wing half white and half black. Head and thorax with much 

 white. 8 mm. 



Larva on Betula nigra. 

 Pennsylvania. 



16. P. inusitatumella Chambers. Ground color uniform; three entire lines in 

 fringe; moth similar to prunivorella, but smaller, with more distinct striae, and 

 no semierect scales on inner margin. 7%-8 mm. 



Larva in an upper-side mine on Cratcegus tomentosus and C. mollis, forming a 

 nearly circular, whitish blotch with scattered frass, later made tentiform. 

 Cocoon yellowish brown, spun on upper side of mine, outside. 



Kentucky ; Ohio. 



P. trepidella and f estinella Clemens are unknown to me ; for "Ornix " querci- 

 foliella Chambers and boreasella Clemens see Acrocercops. 



2. GRACILARIA Haworth 

 (With Coriscium Zeller; EuspUapteryx Stephens, etc.) 



Similar, to Ornix; head smooth: scape sometimes with the rudiment of an eye- 

 cap; palpi smooth, rough, or with a triangular tuft on second segment. Fore 

 wing with all veins (fig. 115) or with one dorsal vein lost; Rj arising close to base, 

 easily mistaken for Sc, which is inconspicuous. Hind wing lanceolate or linear; 

 venation weak and somewhat variable; typically with the tip of R t free as in 

 Parornix. 



The moth rests with head raised, and the two rough-scaled anterior pairs 

 of legs displayed. Larva, after an early stage, cylindrical; at first forming a 

 blotch-mine, later rolling a leaf into a conical nest. A few species are miners till 

 mature. 



The species of this genus are difficult to identify without knowledge of the 

 food plants, as they are closely similar and often highly variable. The key will 

 be a partial guide only. 



Key to the species 



1. Fore wing with a subtriangular, or larger, irregular, golden patch, normally 

 contrasting with the darker ground; well-defined, at least on its basal side, 

 and extending a third way across the wing, or more. 



2. Upper part, at least, of face, and palpi dark.. 19. purpuriella, 20. stiffmatella. 



2. Upper part of face and palpi not dark. 



