NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 543 



Fclderia filicornis Dyar, 1900, Can. Ent., vol. 32, no. 10, p. 310 (name misspelled) ; 

 1903, List North Amer. Lep., p. 579, no. 6599 (Dyar here lists his pre- 

 vious misspelling as a second synonym of filicicornis). 



Acrolophus mexicanellus (?) Beutenmiiller, 1888, Ent. Amer., vol. 4, no. 2, p. 29, 

 May (originally described from Mexico). — Barnes & McDunnough, 1917, 

 Check List Lep. Bor. Amer., p. 191, no. 8190 (syn.). — McDunnough, 1939, 

 Check List Lep. Can. & U.S. Amer., p. 104, no. 9580 (syn.). 



Felderia filicicornis mexicanellus Smith, 1891, List Lep. Bor. Amer., p. 95, no. 5064a. 



Felderia mexicanellus Dyar, 1900, Can. Ent., vol. 32, no. 10, p. 310 (syn.); 1903, 

 List North Amer. Lep., p. 579, no. 6599 (syn.). 



Acrolophus filicicornis Barnes & McDunnough, 1917, Check List Lep. Bor. Amer., 

 p. 191, no. 8190.— McDunnough, 1939, Check List Lep. Can. & U.S. Amer., 

 p. 104, no. 9580. 



Acrolophus filicornis Eyer, 1924, Ann. Ent. Soc. Amer., vol. 17, no. 3, p. 315 

 (name misspelled). 



Walsingham's original description follows: 



Felderia filicicornis — Labial palpi strongly recurved, reaching to the posterior 

 margin of the thorax. Antennae strongly bipectinate, the pectinations being 

 slightly narrower at their bases, wider outwardly, subochreous. Head, thorax, 

 and palpi thickly clothed with fuscous hair-like scales, tipped with hoary white. 

 Fore wings mottled greyish and brownish fuscous; about twelve brownish fuscous 

 ill-defined dots along the costal margin, not arranged in pairs, but distributed at 

 approximately equal distances; a brownish fuscous spot at the end of the cell, 

 from which a streak of the same colour extends obliquely downwards to the anal 

 angle; fringes greyish fuscous, speckled with whitish. Hind wings brownish, with 

 a faint purplish tinge; fringes pale greyish brown. Abdomen brownish. Under 

 side of all the wings pale cinereous, the costal margin of the fore wings not defined 

 by a pale line as in arizonella. Exp. al. cf , 26 mm.; 9 , 27-31 mm. The lateral 

 claspers of the male spoon-shaped, widened in the middle, tapering outwardly, 

 and rounded at the apex; the uncus double, the two points parallel, shorter and 

 wider apart than in arizonellus. 



Hab. One male and five females from Arizona, collected by Morrison. 



This species has much the appearance of arizonella, Wlsm., but the peculiar 

 form of the antennae in the male at once serves to distinguish it. 



Walsingham's illustrations consisted of figure 22, the uncus and 

 cucullus of the harpe in dorsolateral aspect, and figure 22a, the cf 

 antenna in dorsolateral aspect. 



Male genitalia.- — -Vinculum typical, as in other species. 



Tegumen typical, glabrous, not separated along meson. 



Harpe simple. Lateral aspect: linear, constricted near center. 

 Costa and sacculus fused, comprising slightly more than basal half of 

 harpe, approximate apical half broad and somewhat expanded dorsad, 

 basal half approximately half as broad as apical half and with dorsal 

 and ventral margins subparallel, basal extremity broadly and evenly 

 rounded. Cucullus set off from costa and sacculus by constrictions 

 and area of reduced sclerotization, rather broad ; ectal surface strongly 

 convex, heavily punctate and setose; ental surface strongly concave, 

 rather weakly punctate and setose; basal half slightly narrowed, apical 



