544 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



half somewhat expanded ventrad, apical third directed strongly mesad, 

 apex broadly and irregularly rounded. 



Transtilla with arm of medium length, rather slender, linear, 

 glabrous, converging to dorsal margin of costa, terminating acutely 

 slightly distad of basal extremity of harpe. 



Uncus bifid. Dorsal aspect: base heavily punctate and setose 

 especially nearest cephalic margin, cephalic margin fused to tegumen, 

 lateral margins sublinear and moderately convergent distad; angle of 

 bifurcation broad and with or without small, rounded, mesal projection; 

 furcae rather short, robust, conical, setose, broadly separated, gradu- 

 ally narrowing and diverging distad, directed somewhat ventrad, 

 apices acute. 



Gnathos paired; arms rather small, well sclerotized, rather narrowly 

 separated, slightly to strongly convergent distad, apical portions com- 

 monly overlapping, apical thirds wealdy and minutely pitted entad, 

 apices narrowly rounded. 



Anellus large, membranous, unarmed, juxta absent. 



Aedeagus rather elongate and slender, asymmetrical, weakly sinuate, 

 basal and apical portions directed somewhat ventrad in lateral aspect, 

 base moderately expanded ventrad, basal three-fifths slender and 

 cylindrical, apical two-fifths gradually expanding distad, approximate 

 apical fourth opening broadly dextrad; apex bluntly and irregularly 

 rounded laterad, with process arising from dorsal margin. Dorsal 

 process consisting of rather elongate, slender, moderately sclerotized, 

 acute projection partially and indistinctly fusing with adjacent vesica 

 and curving strongly ventrad toward apex ; armed from base to apex 

 with irregular row of approximately 20-35 minute, acute spines 

 directed distad and becoming progressively larger distad. 



Vesica rather large, membranous, dorsal surface unarmed or with 

 several minute cornuti, dextral and ventral surfaces densely armed 

 with 100 or more cornuti; cornuti minute, all approximately equal in 

 size, well sclerotized, with apices acute and blackened, pointing in all 

 directions. 



Type. — cf and 9 types in the British Museum (Natural History). 



Type locality. — "Ai-izona." 



Distribution. — Southwestern United States and Mexico. Arizona 

 and Texas southward into Mexico. 



Sources of material. — American Museum of Natural History 

 (3 cf cf, 2 99); California Academy of Sciences (1 9); Carnegie 

 Museum (1 9); Cornell University (1 cf); Denison University (2 cfcf, 

 1 9); Ohio State University (3 d'cf, 1 9). 



Specimens examined. — 15 (9 cf cf, 6 99), from 10 localities: 



Arizona: Boulder Springs, Mohave Co., c? (July 1-15, 1921, O. C. DuCfner); 

 Elgin, cf, 9 (July 17, 1948, C. & P. Vaurie); Huachuca Mountains, 2 cf cf , 9 



