NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 581 



emarginate, mesal portion fusing indistinctly caudad with base of 

 uncus. 



Harpe simple. Lateral aspect: of medium length, broad, principal 

 parts indistinctly fused, dorsal margin sublinear apicad of dorsal 

 expansion at base of arm of transtilla, ventral margin sinuate, approxi- 

 mate apical third very heavily punctate ectad and entad, approximate 

 central third glabrous except for sparsely punctate and setose dorsal 

 and ventral areas on ental surface, basal portion glabrous and nar- 

 rowing u'regularly basad of point of attachment of arm of transtilla 

 to narrow basal extremity, apex broadly and evenly rounded. 



Transtilla with arm glabrous, well sclerotized, linear or sublinear, 

 slightly more than one-fourth to one-third as long as harpe, parallel 

 to or du'ected somewhat ventrad of longitudinal axis of main portion 

 of harpe, increasingly divergent distad from margin of costa and with 

 apex widely separated from basal extremity of harpe, terminating 

 subacutely slightly to considerably beyond base of harpe. 



Uncus bifid. Dorsal aspect: base large, glabrous, mesal portion 

 rather weakly sclerotized; lateral margins heavily sclerotized, linear, 

 evenly converging caudad into furcae; angle of bifurcation rather 

 narrow, evenly rounded. Furcae rather elongate and slender, tubular, 

 very sparsely punctate, evenly curving caudoventrad, rather closely 

 subparallel, apical portions generally slightly convergent, apices acute 

 and narrowly separated. 



Gnathos pau-ed but commonly obscurely so, possibly transitional 

 between paired and fused types, directed caudoventrad; basal portion 

 with mesal area broad and membranous, lateral margins heavily 

 sclerotized and converging distad; apical portion well sclerotized, 

 very heavily scobinate, lateral margins converging distad; apex clearly 

 to rather obscurely cleft into two rather short arms with subacute 

 apices. 



Anellus membranous, unarmed, juxta absent. 



Aedeagus slender, rather short, approximately two-thirds to almost 

 three-fourths as long as harpe, glabrous, cylindrical, somewhat asym- 

 metrical, sublinear in dorsal and ventral aspects, apical and basal 

 portions curving slightly ventrad in lateral aspect; approximate basal 

 fourth evenly expanded, opening broadly ventrad; remainder of 

 aedeagus gradually narrowing to apex; approximate apical half to 

 two-fifths opening lateroventrad, apex acute. 



Vesica rather small, elongate, narrow, membranous, unarmed. 



Holotype cf, U.S. National Museum, type no. 61439, from 

 St. Xavier Monument, Tucson, Pima Co., Ariz., August 12, 1924, 

 J. O. Martin. The remaining 12 cT cf and 1 9, all from the Depart- 

 ment of Entomology, California Academy of Sciences, have been 

 designated as paratypes and bear the following data: St. Xavier 



