NORTH AMERICAN ACROLOPHIDAE — ^HASBROUCK 595 



In the U.S. National Museum there is a sUde of cf genitaha labeled 

 "cressoni ^Vlsm." Upon examination of this preparation, I found 

 that it agreed with my concept of this species. 



Darlington (in htt., 1946) has reported an additional type specimen 

 of this species at the Academy of Natural Sciences as follows: "cressoni 

 Wish. Type. Expanded and in fair condition, maculation distinct. 

 There might be some question as to whether this is the type or only 

 a paratype." 



21. Acrolophus crescentellus (Kearfott) 



Figures 110-111 



Amydria crescentella Kearfott, 1907, Can. Ent., vol. 39, no. 1, p. 9, Jan. — Barnes 

 & McDunnough, 1917, Check List Lep. Bor. Amer., p. 192, no. S208. 



Acrolophus (Amydria) crescentella Busck, 1910, Proc. Ent. Soc. Washington, 

 vol. 11, no. 4, p. 187. 



Myrmecozela crescentella McDunnough, 1939, Check List Lep. Can. & U.S. 

 Amer., p. 104, no. 9598. 



Kearfott's original description follows: 



Amydria crescentella — Expanse, 16 to 18 mm. 



Palpi, head, antennae and thorax very pale browoi, dusted with dark brown, 

 the latter predominant on external surfaces of palpi. Abdomen and legs pale 

 cinereous, tarsi dusted with brown. 



Fore wing creamy white, slightly dusted with brown scales; this light ground 

 colour only occurs in a large triangular basal patch, extending to a quarter on 

 costa and nearly to middle on dorsal margin. A curved oblique fascia from 

 middle of costa to end of cell, a similar but narrower fascia from costa just before 

 apex, curving inwardly towards but not reaching the middle fascia. These two 

 fascias are so sharply defined against the dark brown of the balance of the wing 

 that they appear as a crescent-shaped band, interrupted in the middle. 



The balance of the wing is cinnamon-brown, dotted with darker browTi. In 

 some specimens the pale basal area is rather heavily dusted with brown inwardly, 

 leaving only the margin of the pale colour, forming a narrow oblique fascia. On 

 the costa, within the crescent, are two pale dashes separated by a dark dot, and 

 outwardly bounded by dark bro^vTi, which also extends below them. Before the 

 middle of fascia the costa is cream colour, marked by a number of brown dots. 

 On the outer margin is a line of dark brown dots, separated by a few paler scales. 

 Cilia same as dark portion of wing. 



Hind wing light cinnamon-brown, under side of both wings the same. 



Five specimens, all Baboquivaria Mountains, Pima C, Arizona, July 15 to 30; 

 two collected by Prof. F. H. Snow, three by Mr. O. C. PoHng. 



Types, University of Kansas and in my collection. 



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



Tegumen with lateral arm heavily punctate except in cephalic and 

 basal areas, abruptly narrowing in basal third to point of articulation 

 with vinculum, central third considerably expanded ventrad, apical 

 third evenly narrowing dorsocaudad ; dorsal area almost entirely 

 divided along meson by cephalic emargination, mesal and caudal 

 areas glabrous, laterocephalic areas punctate. 



