274 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



last segment broadly rounded at apex ; vertical portions of first seg- 

 ment densely clothed with recumbent, silvery white pubescence; 

 pygidium feebly carinate, but the carina not projecting. Prosternum 

 sparsely, finely punctate, and sparsely clothed with recumbent, whit- 

 ish hairs; prosternal lobe broad, slightly declivous, and broadly 

 l'ounded or subtruncate in front; prosternal process broad, the sides 

 slightly expanded behind the coxal cavities, then obliquely narrowed 

 to the apex, which is acute. Tibiae slender, straight, and without a 

 tooth at apex. Posterior tarsi distinctly shorter than tibiae, and the 

 first joint scarcely as long as the following two joints united. Tarsal 

 claws similar on all feet, cleft near the middle, the inner tooth broad, 

 about one-half as long as outer one, and not turned inward. 



Length, 4.9 mm. ; width, 1.3 mm. 



Male. — Differs from the female in having the front of head nar- 

 rower, less convex, slightly wider at bottom than at top, the lateral 

 margins more strongly constricted below the middle, and the surface 

 aeneous or cupreous, subopaque, densely granulose, and rather 

 densely clothed with long, recumbent, whitish hairs; eyes more 

 broadly oblong, and about equally rounded beneath and above ; pro- 

 sternum densely clothed with long, fine, erect hairs; first abdominal 

 segment broadly, longitudinally concave at middle, the concavity not 

 very deep or densely pubescent, and the anterior and middle tibiae 

 armed with a short tooth on inner margin at apex. 



Redescribed from the female lectotype No. 3492 in the Philadel- 

 phia Academy of Natural Sciences. 



Type locality. — Southern Arizona. 



DISTRIBUTION 



Material examined : 



Arizona: Hot Springs, June 25 (Barber and Schwarz). Phoenix ( ). 



California : Yuma, April 22, 1908 ( ) . 



New Mexico: Alamogordo, May 10, 1902 (H. L. Viereck). Wootens (W. 



Knaus). 

 Texas: San Antonio, May 31, 1905 (A. C. Morgan). Devils River, May 4, 



1907; Beeville, April 22; San Diego, April 29 (E. A. Schwarz). Sanderson, 



May 9, 1912 (D. J. Mitchell). Laredo, March 26, 1908; Cotulla, March 28, 



190S (Jones and Pratt). 



Valuations. — The numerous specimens examined are rather con- 

 stant in appearance, varying in length from 3 to 4.5 millimeters, and 

 the pubescent spots may be more or less abraded. 



Hosts. — Chittenden (1900) records this species having been reared 

 from twigs and branches of Mesquite (Prosopis juliflora (Swartz) 

 de Candolle) and Huisache (Acacia fames iana (Linnaeus) Willde- 

 now) by E. A. Schwarz at San Antonio and Brownsville, Tex. One 

 of these plants is probably the host plant for prosopidis Fisher, as 



