A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 39 



two more or less distinct, smooth, irregular callosities arranged transversely 

 in front of middle ; surface coarsely, rather densely, deeply, irregularly punctate, 

 slightly rugose at sides, with a few rather long, erect, inconspicuous hairs, the 

 intervals nearly smooth; 



Elytra at base slightly wider than pronotum at middle, nearly twice as long as 

 wide; sides nearly parallel from humeral angles to apical third (slightly ex- 

 panded behind middle), then arcuately converging to the tips, which are sep- 

 arately broadly rounded ; lateral margins finely serrate ; basal depressions broad 

 and deep ; humeral depressions broad and shallow ; surface rather densely, 

 finely, deeply, irregularly punctate, transversely rugose at sides, sparsely clothed 

 with moderately long, semierect, white hairs. Each elytron with four more 

 or less distinct longitudinal costae, the first distinctly elevated from apex to 

 middle, the others less distinct and broadly interrupted, and with three broad, 

 slightly depressed foveae, one in front of middle and two arranged subtrans- 

 versely behind the middle. 



Abdomen beneath sparsely, coarsely, but not deeply punctate, sparsely clothed 

 with moderately long, recumbent, whitish hairs, the intervals slightly granulose, 

 and each sternite with a smooth callosity on each side near lateral margin; 

 last visible sternite broadly rounded and sinuate at apex, the lateral margins 

 finely serrate ; eighth tergite broadly rounded at apex, densely, coarsely, deeply 

 punctate, densely granulose, but not longitudinally carinate. Prosternum 

 coarsely, sparsely punctate, sparsely clothed with long, recumbent, white hairs ; 

 anterior margin with a broad, short, median lobe. Anterior femur with a large, 

 acute tooth, which is strongly dentate on outer margin. Anterior tibia slightly 

 arcuate ; middle and posterior tibiae straight. 



Length 7.5 mm., width 3 mm. 



Kedescribed from the female type, No. 2703, in the Museum of Com- 

 parative Zoology, Cambridge, Mass. 



Male. — Differing from the female in having the head bright green in front, but 

 becoming cupreous on the occiput, the antenna bronzy green, the prosternum 

 more coarsely, densely punctured, the last visible sternite broadly, deeply, ar- 

 cuately emarginate at apex, and anterior and middle tibiae expanded at apices, 

 the former armed with a small tooth near apex. 



Type locality. — Of deleta, "California;" of sub cylindrical Nova- 

 Helvetia (Sacramento, Calif.). Type of subcylindrica in the Zoo- 

 logical Museum of the University of Moscow and not seen by the 

 writer. 



DISTRIBUTION 



From material examined : 



California: No definite locality, type (A. Murray). Los Angeles County 

 (D. W. Coquillett). San Diego (G. H. Field). Amedee, July 21-28, 4,200 

 feet (H. F. Wickham). 



Idaho: Pocatello, June 24 (E S. G. Titus). 



Nevada: Reno, July 18 (H. F. Wickham). 



Oregon: Cordon, July 8 (W. J. Chamberlin). 



Utah : South Creek, Beaver County, June 22. 



The species has also been recorded in the literature from the 

 following : 



Arizona : No definite locality. 



California: Owens Valley, Palm Springs, Tallac, Freeman, Castella, Lake 



Tahoe, Azusa, Yuma, and Pasadena. 

 New Mexico : Silver City. 

 Utah : Virginia River. 



Gemminger and Harold (1869) list subcylindrica from Alaska, 

 but if its host is mesquite, this record must apply to some other species. 

 Horn (1886) records it from Washington Territory, but the specimen 

 under deleta in the LeConte collection is mali. 



Hosts. — Woodworth (1913) records deleta as attacking mesquite 

 (Prosopis juliflora (Swartz) De Candolle). Chamberlin (1925) 



