526 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



Thousand Palms, Tracy, Ventura Co., Victorville, Visalia, Wescott, Whittier. 

 Colorado: Long's Peak. Idaho: Boise, Caldwell, Freedom, Lewiston, Notus, 

 Parma, Star. Nevada: Las Vegas. New Mexico: Alamogordo, Albuquerque, 

 Drolets, Fort Wingate, Grand Canyon, Grants (Valencia Co.), Jemez Springs, 

 Las Cruces, Lordsburg, Rodeo, Roswell. Oregon: Arlington, Biggs, Boardman, 

 Corvallis, Dalles, Hermington, Island City, Ontario, Pendleton, Rufus, Umatilla. 

 Texas: Davis Mts., El Paso, Fabans, Sierra Blanco (Fil Paso Co.), Van Horn. 

 Utah: Clinton, Delta, Farmington, Green River, Hooper, Hermiston, Kaysville, 

 Knab, Layton, Moab, Oren, Pine Valley, Roy, St. George, Salt Lake City, Santa 

 Clara, Spanish Fork, Syracuse, Wasatch Mts., Washington Co., Zion National 

 Park. Washington: Dayton, Pasco, Pullman, Toppenish, Walla Walla, Wa- 

 wawai, Wenatehee, Yakima. MEXICO: Agxjascalientes: Aguascalientcs. 

 Baja California: Enzenada, San Felipe. Chihuahua: 20 miles southwest of 

 Camargo, Juarez, Marachee (10 miles south of Las Delicias), Ojo Laguna, 

 Samalayuca, Santa Barbara. Durango: Durango. San Luis PoTOsf: San Luis 

 Potosi, 30 miles southwest of San Luis Potosi. Sonora: Rocky Point. Zaca- 

 teca: San Alto. 



Of specimens intermediate between gibbosufi (DeGeer) and ob- 

 soletus LeConte: 



UNITED STATES: Arizona: Bonita, Cochise Co., Douglas, Graham Mts., 

 Phoenix, Portal, Tucson, Wilcox. Colorado: Crook, Fort Collins, Roggen. 

 New Mexico: Albuquerque, Deming, Escondido, Jemez Mts., Lordsburg, Rodeo, 

 State College, Thatcher. Oklahoma: Tulsa. Texas: Alpine, Brewster Co., 

 Costolon, Dalhart, Davis Mts., Ei Paso, Fort Davis, Presidio. MEXICO: 

 Aguascalientes: Agu.ascalientes. Chihuahua: Arroyo Caterinas (15 miles 

 south of Matamoros), 10 miles south of Las Delicias, Santa Barbara. Durango: 

 Durango. San Lvis PoTOsf: San Luis Potosi, 30 miles southwest of San Luis 

 Potosi. 



Remarks: Bothy nus obsoletus LeConte is easily separated from 

 typical gibbosu.s from the Eastern States. It is somewhat larger (11 

 to 20 mm. in length), smoother in appearance with denser pilosity on 

 the underside. The sides of the pronotum just under the margin 

 are convex, at times so much so that the lateral margin anteriorly 

 appears almost carniform. Posteriorly at sides and apex the punc- 

 tm"es of the elytra become closer, finer, and nearer one size in obsoletus. 

 The punctures of the pronotum and elytra are finer and usually not 

 noticeably annular even in the elytral striae. The carina extending 

 the elytra] margin inward around the humerus is lower down and does 

 not continue inward as far as in t^-pical gibbosus. The posterior 

 tibiae are short, heavy, and very wide apically, their width usually 

 more than half the tibial length as measured along the inside edge. 

 The first segment of the posterior tarsus is comparatively narrow 

 basally and produced laterally at the apex, one side being nearly 

 straight and the other noticeably sinuate in outline. Its width 

 apically is frequently greater than the length of the second segment. 

 Typical obsoletus is fomid in western Idaho, Washington, Oregon, 



