22.4 William T. M. Forbes 



Family 17. DOUGLASIIDJE 



(Elachistida?; Glyphipterygida?, in part) 



Head about as in the other two families of the Elachistoidea ; palpi 

 intermediate in size, stout and drooping, the lower part of the face 

 rather more smoothly scaled. Ocelli very large. Fore wing lanceolate ; 

 R 5 , when present, free from R 4 , but stalked with M 17 running to costa; 

 sometimes a radial absent; number of dorsal veins varying, but appar- 

 ently all present in our species; 1st A free, but weak; 2d A strongly 

 forked at base. Hind wing narrow-lanceolate, Sc ending about at 

 middle of costa; R-stein running through middle of wing, bearing 

 Raw on its anterior side two-thirds way out; one medial arising before, 

 and one beyond R 2+3 . Cu simple, free. 



Larva a leaf -miner on Rosacea? and related plants. Larva short 

 (fig. 132), fusiform, with normal head and eyes; front extending two- 

 thirds way to vertex and adfrontals reaching vertex. Cervical shield 

 with six seta?, arranged in a hexagon; prespiracular wart with three 

 large seta?, and subventrals of all three thoracic segments with two ; 

 ia and ib obliquely placed, much like i and ii of the abdomen. Abdo- 

 men with i and ii, iiia and iii obliquely placed, similar, approximate, 

 iv and v equal, approximate, and on a level; two upper setae of vii 

 widely separated from the lower one, which is on the leg base; pro- 

 legs small, rather near midventral line, apparently without hooks ; 

 proleg of seventh segment smaller than the others; ninth segment 

 with seta? iv lower than ii, nearest to iii. Spiracles circular, pupa 

 not studied. 



This larva appears as aberrant as the moth, and helps little in 

 placing the family, which is only tentatively associated with the 

 Cycnodiidas. 



TINAOMA Zeller 

 (Douglasia, in part) 



Palpi rough-scaled below; wing scaling not shining. Antennal segments of 

 normal length, with single whorls of very slender scales (fig. 131). Larva on 

 Potentilla, Geum, and related Rosacea?. 



1. T. obscurofasciella Chambers. Blackish, dusted heavily on a dirty white 

 ground, the effect mouse-gray, the bands yellowish brown, lightly dusted and 

 more or less defined with black. A broad band, with slightly excurved outer 

 boundary at middle of wing, and extending almost to base, lightly edged with 

 white; and a more irregular diffuse fascia near apex, not reaching costa; apex 

 yellower. 7 mm. ( crenulellum Engel; Douglasia Chambers.) Moth probably 

 generally distributed but overlooked; flying in May. 



Ontario to southern Ohio. Xew York: Black Brook (Clinton County), Rock 

 City (Cattaraugus County). 



