NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 601 



apical areas narrowed, central area considerably expanded, apices 

 directed caudoventrad and terminating acutely. 



Gnathos paii-ed, similar to that of piger; arms directed ventrad, 

 lateral margins heavily sclerotized, apical portions scobinate and 

 slightly overlapping, apices bluntly rounded. 



Anellas membranous, glabrous, juxta absent. 



Aedeagus of medium length and width, cylindrical, asymmetrical, 

 glabrous, sublinear in dorsal and ventral aspects, approximate apical 

 half curving gi-adually ventrad in lateral aspect, base somewhat ex- 

 panded laterad, approximate apical three-fifths opening broadly ven- 

 trad; sinistral wall of aedeagus containing elongate, narrow, heavily 

 sclerotized area extending almost to and becoming more distinct toward 

 apex. 



Vesica membranous, armed with approximately fifteen cornuti of 

 various sizes, several very minute. Cornuti located mostly in perim- 

 eter of vesica and superficially appearing to belong to adjacent bor- 

 ders of aedeagus; arranged in form of incomplete oval along sinistral, 

 ventral, dextral, and apical margins of vesica; well sclerotized, apices 

 acute, two apical cornuti about twice as large as others and directed 

 distad. 



Type. — Holotype cf (type no. 61441) in the U.S. National Museum. 



Paratypes (6cf cf, 3 99). — California Academy of Sciences (Icf); 

 U.S. National Museum (5 d^ cf , 3 99) . 



Type locality. — San Benito, Cameron Co., Tex. (Sept. 8-15, 

 collector unknown). 



Distribution. — Southwestern United States. Texas westward to 

 Arizona. 



Specimens examined. — 10 (7 cfcf, 3 99), from 5 localities: 



Arizona: Baboquivari Mountains, Pima Co., ? (June 15-30, 1923, elevation 

 approximately 5000 feet, O. C. Poling), 2 cf cT, 9 (Aug. 15-30, 1923, Poling), c?, 

 9 (July 15-30, 1924, Poling); Patagonia, Santa Cruz Co., cf (Aug. 2, 1924, 

 E. P. Van Duzee). Texas: Brownsville, Cameron Co., cf (April 28, 1904, 

 H. S. Barber); San Benito, Cameron Co., cf (Sept. 8-15, collector unknown); 

 San Diego, Duval Co., d^ (May 26, 1895, E. A. Schwarz). 



Remarks. — This species undoubtedly ranges southward into 

 Mexico. It is closely related to piger, the two comprising a small 

 species group. A. vanduzeei may be distinguished from its close 

 relative, and from all the other acrolophids treated here, by its charac- 

 teristic harpe and aedeagus. In the latter structure, the armature of 

 the vesica is distinctive for this species. In other respects, vanduzeei 

 is similar to piger on the basis of general habitus and genital structure ; 

 the similarity is especially noticeable in regard to their oddly shaped 

 unci. This species is named in honor of the late Edward P. Van 



