NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 525 



graphs of this moth and its genitaha clearly represent a typical speci- 

 men of Acrolophus mortipennellus (Grote). Thus, Fernald's manu- 

 script species name (chironym) and the specimen it designates 

 (chirotype) are synonymous with Grote's species. Forbes (1890, 

 p. 101, pi. 6, fig. 1) refers to "Caenogenes mortipennella" in Illinois. 

 However, no North American species of Acrolophidae has ever been 

 described as new under Caenogenes. 



1. Acrolophus dorslmaculus (Dyar) 



Figures 25-29 



Felderia dorsimacula Dyar, 1900, Can. Ent., vol. 32, no. 11, p. 328, Nov.; 1903, 



List North Amer. Lep., p. 579, no. 6600. 

 Acrolophus dorsimacula Barnes & McDunnough, 1917, Check List Lep. Bor, 



Amer., p. 191, no. 8191.— McDunnough, 1939, Check List Lep. Can. & U. S. 



Amer., p. 104, no. 9581. 



Dyar's original description of this species follows: 



Felderia dorsimacula — Palpi strongly recurved to base of thorax, pale gray 

 before, black outwardly; head and thorax dark gray. Fore wing gray, dark on 

 the costal half, more cinereous along internal margin, mottled with dark brown. 

 A triangular black patch with point on centre of inner margin and the broadest 

 side on the median vein, joined outwardlj' to a triangular discal patch, that is 

 extended in a curved band nearly to apex, where it becomes obsolete. Hind wings 

 rather light gray, a little darker toward the margin. Expanse 24 to 26 mm. 

 Male genitalia with uncus single, a broad triangular plate, tapering rapidly to a 

 point; harpes slender, rather flat, long, well curved at base, the tips oblique above. 



Nine specimens: Huachuca Mts., Arizona; July 24 to Aug. 15 (Dr. W. Barnes); 

 U.S. Nat. Mus., type No. 5346. 



Male genitalia. — Vinculum rather large, well sclerotized, other- 

 wise typical. 



Tegumen very narrow, glabrous; lateral arm elongate, sublinear, 

 margins subparallel; dorsal area separated from base of uncus by 

 areas of reduced sclerotization. 



Harpe simple, w4th major portion of cucullus curving strongly 

 toward meson of genital capsule in dorsal and ventral aspects. Costa 

 and sacculus in lateral aspect fused, rather elongate and narrow, 

 comprising approximate basal three-fifths of harpe, glabrous, broadest 

 in central portion, apical portion only slightly narrowed, basal third 

 considerably narrowed. Cucullus in lateral aspect quite distinctly 

 set off from costa and sacculus by areas of reduced sclerotization, 

 ectal surface heavily punctate except for glabrous basal extremity, 

 ental surface and margins rather sparsely setose, approximate basal 

 third slightly constricted and curving somewhat dorsad, apical two- 

 thirds expanded and directed somewhat ventrad; in dorsal aspect 

 approximate basal third irregularly expanded toward meson, basal 



