NORTH AJMERICAN ACROLOPHIDAE — HASBROUCK 589 



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

 tate, lateral margins very heavily sclerotized and evenly converging 

 caudad into furcae; angle of bifurcation acute, narrow. Furcae 

 fairly robust, tubular, sparsely punctate, evenly cui-ving caudo- 

 ventrad, basal halves rather closel}^ subparallel, apical halves some- 

 what divergent distad, apices acute. 



Gnathos typically paired, directed mostly ventrad, arms glabrous, 

 apices narrowly rounded and partially overlapping. 



AneUus membranous, unarmed, juxta absent. 



Aedeagus with length and width medium, approximately two- 

 thirds as long as harpe, cj^lindrical, asymmetrical; basal fifth some- 

 what expanded, evenly ciu-ving ventrad, opening dorsad; remainder 

 of aedeagus sublinear in all aspects, expanding slightly toward apex; 

 apical half opening broadly dorsodextrad, terminating subacutely, 

 armed with numerous extremely minute spinelike processes. 



Vesica large, membranous, unarmed. 



Type. — Holotype cf and allotype 9 in the California Academy of 

 Sciences. 



Paratypes (10 cfcf, 1 9). — American Museum of Natural His- 

 tory (2cfcf); California Academy of Sciences (TcfcT, 19); U.S. 

 National Museum (1 cT). 



Type locality.- — Tucson, Pima Co., Ariz. (St. Xavier Monument, 

 July 29, 1924, E. P. Van Duzee). 



Distribution.- — Southwestern United States. Southern Arizona. 



Specimens examined.- — 15 (llcfcf, 4 99), from one locality: 



Arizona: Tucson, 9 c?" cf , 4 9 9 (St. Xavier Monument, July 29, 1924, E. P. 

 Van Duzee and J. O. Martin), c? (July 30, 1937, A. B. Klots), cf (July 30, 1943, 

 Fred H. Rindge collection). 



Kemarks. — This species undoubtedly ranges southward into Mexi- 

 co. Of the four 9 9 listed above, the allotype and paratype have been 

 associated with the cf cT of luriei Avitli reasonable certainty, the third 

 9 is probably luriei, and the fourth possibly belongs to this species. 



A. luriei is very closely related to arizonellus, the two comprising 

 a small species group which has been characterized in the foregoing 

 remarks on arizonellus. Both species are similar in general habitus 

 and genital structure. In addition, a comparison of the locality rec- 

 ords reveals that the two have been taken together at Tucson, Ariz., 

 by various collectors. Of the two species, however, luriei is generally 

 smaller and darker, its forewings exhibit a simpler or reduced color 

 pattern, and its labial palpi are less heavily clothed witli scales. In 

 regard to genital structure, luriei differs from arizonellus in that the 

 former lacks the angular formation at the ventrocaudal extremity of 

 the sacculus of its harpe and that it also lacks cornuti in the vesica of 

 its aedeagus. Aside from being somewhat smaller, the remaining 



