642 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



Uncus single. Dorsal aspect: rather large, subtriangular ; base 

 with cephalic margin indistinctly fusing with tegumen, large mesal 

 area rather weakly sclerotized and glabrous; lateral margins of base 

 heavily sclerotized, set off from tegumen by areas of reduced sclero- 

 tization, sparsely punctate and setose, sublinear, gradually con- 

 verging distad into uncal process; uncal process rather robust, well 

 sclerotized, concave beneath, curving considerably ventrad, apex 

 subacute. 



Gnathos fused, large and broad, considerably flattened dorsoven- 

 trad, curving ventrocaudad, mesobasal portion rather weakly sclero- 

 tized, apical portion becoming fairly well sclerotized and scobinate 

 distad, lateral margins well sclerotized, apex very broadly and evenly 

 rounded. 



Anellus large, membranous, armed mesocaudad with juxta. Juxta 

 large but rather weakly sclerotized, consisting of subsymmetrical 

 pouch opening at cephalic and caudal extremities, surrounding and 

 serving as guide for aedeagus, approximately one-third as long as 

 aedeagus, base truncate, lateral margins diverging distad, apical 

 extremity almost twice as broad as basal extremity, ventral portion of 

 apical margin broadly emarginate, ental surface striate (especially in 

 dorsal and apical portions), ectal surface rather densely covered with 

 extremely small seta-like processes. 



Aedeagus considerably reduced, slightly more than half as long as 

 harpe, asymmetrical, sublinear in all aspects; base somewhat expand- 

 ed, emarginate ventrad, opening dorsad; approximate basal half 

 cylindrical; central portion with dextral margin somewhat expanded 

 and produced into one large and several minute, acute, well sclero- 

 tized, spinelike processes directed distad; approximate apical half 

 broadly opening dorsad and consisting of broad ventral strip irregularly 

 narrowing distad and terminating in narrowly rounded apex. 



Vesica medium sized, membranous, unarmed. 



Type.- — Holotype cf (type no. 61445) in the U.S. National Museum. 



Paratypes (2 (J^ d^).- — Illinois State Natural History Survey (1 cf ); 

 U.S. National Museum (1 cf ). 



Type locality.— Pecos, San Miguel Co., N. Mex. (July 17, T. D. A. 

 Cockerell). 



Distribution. — Western United States. New Mexico and Utah. 



Specimens examined.- — 3 (all cf cf), from 2 localities: 



New Mexico: Pecos, San Miguel Co., 2 cf cf (July 17, T. D. A. Cockerell) 

 Utah: Salt Lake City, Salt Lake Co., cf (no date, Andreas Bolter collection) 



Remarks.^ — This moth is quite rare in collections. It is not closely 

 related to any of the other acrolophids known to occur in America 

 north of Mexico. A. juxtatus is generally related to those species hav- 

 ing shortened labial palpi. Specifically, it may be characterized by its 



