596 PROCEEDINGS OF THE NATIONAL MUSEUM vol. u4 



Harpe simple. Lateral aspect: similar to that of cressoni, but with 

 basal half curving ventrad and apical half curving back dorsad 

 equally as far. Costa and sacculus reduced, fused, comprising 

 slightly more than basal third of harpe, glabrous except for heavily 

 punctate and setose subdigitate ventrocaudal margin of sacculus, 

 basal third very narrow. Cucullus only partly distinct from costa 

 and sacculus, gradually curving mesad in apical half, large, elongate, 

 rather broad, heavily punctate and setose (especially entad), dorsal 

 and ventral margins subparallel, apical third slightly expanded, 

 apex broadly and evenly rounded. 



Transtilla with arm rather short, glabrous, slightly convergent 

 with dorsal margin of costa, about one-sixth as long as harpe, ter- 

 minating above base of harpe. 



Uncus simple, similar to that of cressoni. Dorsal aspect: base 

 glabrous, with cephalic margin emarginate mesad; lateral margins 

 heavily sclerotized, sublinear, gradually converging into uncal proc- 

 ess. Uncal process fused with basal area, slightly expanded before 

 apex in dorsal aspect, gently curving ventrad to apex, sparsely 

 punctate, apex minutely and acutely bifid as in maculijer and cressoni. 



Gnathos fused, similar to that of cressoni; reduced, heavily sclero- 

 tized, glabrous, thickened dorsoventrad except in apical area, curving 

 ventrocaudad, lateral margins sublinear and converging gradually 

 to subacute apex. 



Anellus membranous, glabrous, juxta absent. 



Aedeagus rather short and slender, asymmetrical, glabrous, linear 

 in dorsal and ventral aspect, basal and apical quarters curving gently 

 ventrad in lateral aspect, basal quarter somewhat expanded laterad 

 and broadly opening dorsad, apical three-fourths tubular and gradu- 

 ally narrowing to narrowly rounded apex, apical area with small dextral 

 opening. 



Vesica small, membranous, glabrous. 



Type. — Three cf cotypes (type no. 61451) in the U.S. National 

 Museum. Two additional cotypes presumably at the University of 

 Kansas. 



Type locality. — Baboquivari Mountains, Pima Co., Ariz. 



Distribution. — Southwestern United States. Southern Aiizona. 



Source of material. — American Museum of Natural History (8 

 cTcf, 1 9). 



Specimens examined. — 9 (8 cf cf, 1 9), from one locality: 



Arizona: Tucson, Pima Co.. 8 d^ cf, 9 (July 30, 1937, A. B. Klots). 



Remarks. — This species undoubtedly ranges southward into Mexico. 

 The specific name should be spelled crescentellus to agree grammati- 

 cally with its present genus. It is closely related to cressoni and 

 maculijer, with which it forms a distinct species group, which has been 



