NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 585 



Walsingham's original description follows : 



Acrolophus arizonellus — Palpi, cf, recurved, reaching beyond the middle of the 

 thorax; 9 short, slightly upturned, but scarcely reaching more than the length of 

 the head beyond it. Antennae subochreous, rather flattened, simple, having a 

 very slight notched appearance owing to the scales on the upper side being a little 

 raised at the joints. Head, thorax, and palpi pale brownish, with a slightly hoary 

 appearance from an admixture of grey hairs. Fore wings grejdsh brown, sprinkled 

 with dark brown scales; the costal margin very narrowly subochreous, with about 

 six pairs of ill-defined dark brown dots along it; a conspicuous dark brown spot at 

 the end of the cell and another on the fold at one-third from the base ; below this in 

 one specimen is a pale patch; the fringes slightly paler than the wing, but mottled 

 with brown; under side pale brownish, the margins narrowly greyish ochreous. 

 Hind wings brown, with pale tips to the fringes; under side pale brownish. Abdo- 

 men: the long hairy clothing of the base of the abdomen above is pale greyish 

 ochreous, the abdomen itself inclining to brown; lateral claspers elongate, spoon- 

 shaped, curved inwards, tending to form a slight angle at their upper and outward 

 extremity; the uncus double, with the two points very slightly diverging and not 

 widely separated. Exp. al. cf , 25 mm.; ? , 36 mm. 



I have a male and two females from Arizona, collected by the late Mr. Morrison. 



Walsingham's illustrations of the cf genitalia consisted of the uncus 

 and the cucullus of the harpe in lateral aspect and the uncus in dorsal 

 aspect. 



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



Tegumen glabrous; lateral arm broad, narrowing toward point of 

 articulation with vinculum; dorsal area broad, not separated along 

 meson. 



Harpe simple. Lateral aspect: rather elongate and slender, ven- 

 tral margin abruptly and deeply emarginate near center to form con- 

 stricted area of harpe; costa and sacculus indistinctly fused, comprising 

 approximate basal half of harpe, glabrous, dorsal and ventral margins 

 sinuate, broadest in apical third, approximate basal two-thirds abrupt- 

 ly narrowing immediately basad of point of attachment of arm of 

 transtilla to less than half width of apical third, basal half gradually 

 narrowing and curving somewhat dorsad toward rather narrowly 

 rounded basal extremity, ventrocaudal extremity of sacculus prom- 

 inently angulate; cucullus fairly well set off from costa and sacculus 

 by dorsal and ventral constrictions near base, comprising apical half 

 of harpe, sublinear, heavily punctate and setose except at base, dorsal 

 margin sublinear but commonly becoming serrate toward apex, ven- 

 tral margin smooth and expanding ventrad, base narrowed, broadest 

 in apical thii-d, apex narrowing ventrad. 



Transtilla with arm large, elongate, of medium width, glabrous, 

 rather widely subparallel with dorsal margin of costa, terminating 

 subacutely somewhat distad of basal extremity of harpe. 



Uncus bifid. Dorsal aspect: base with lateral areas heavily punc- 

 tate, lateral margins weakly sinuate and converging distad; angle 



