518 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



Thorax black except for a yellow band on the pronotum, divided 

 by an area of ferruginous, and the yellow metanotum; tegulae low, 

 smooth, and yellow bordered with ferruginous; enclosure hea\dly 

 ridged longitudinally; mesosternal tubercles absent; legs ferruginous 

 shading into yellow on some more apical segments; wings sub hyaline 

 clouded with ferruginous. 



Abdomen with the first tergum largely ferruginous, a broad yellow 

 band on tergum 2 bordered with ferruginous, terga 3 and 4 with nar- 

 row bands becoming broad laterally and tergum 5 with a broad but 

 emarginate band; venter dark with somewhat lighter posterior mar- 

 gins; pygidium with sides slightly convex and converging to a round 

 apical end. 



Male.' — Indistinguishable. 



Three male specimens taken at Scott City, Kans., July 1929 

 (V. F. Calkins) (the same place, time, and collector as for the three 

 females), agree very well with specimens of males of C. morata Cresson. 

 One of the above three males is dark and has all but lost its feiTuginous 

 coloring and, as a result, very closely agrees with the males of C. cly- 

 peata Dahlbom. The southern range of C. vicina Cresson so overlaps 

 the northern range of C. morata Cresson, that, for the present, the 

 writer is unable to distinguish between the males of these two species 

 within the overlapping area. 



C. vicina Cresson shows the usual variation in the extent of the 

 colored markings. It is related most closely to C. morata Cresson, 

 from which the females of the former may be separated by the form 

 of their clypeal processes. The latter species is taken largely in 

 Texas, New Mexico, and adjoining states. 



Types. — The type female of C. vicina Cresson, from the Rocky 

 Mts., Colorado Territory (Riding), is at the Philadelphia Academy 

 of Natural Sciences, no. 1939. The type female of C. platyrhina 

 Viereck and Cockerell, from Filmore Canyon, Organ Mts., N. Mex., 

 Aug. 29 (Cockerell), is at the Philadelphia Academy of Natural 

 Sciences, no. 10384. 



Distribution. — On the east slope of the Rocky Mts. in Nebraska, 

 Kansas, and Colorado. Specimens are as foUows: 



Colorado: ?, Boulder, Oct. 14, 1930 (C. A. Smith); 3 9 9, "Colo." (C. F. 

 Baker) ; 9 , Colorado City, Bear Creek Canyon, July (E. S. Tucker) ; 9 , Colo- 

 rado Springs, Ei Paso Co., Aug. 13, 1945 (I. J. Central) ; 2 9 9 , Fort Collins, 

 July 11, 1937, July 11, 1938 (M. T. James); 9, Greeley, Sept. 19, 1931, Solidago 

 sp. (R. Sumaer) ; 9 , Limon, Aug. 16, 1949 (R. R. Dreisbach) ; 2 9 9 , Wray, 

 3700 ft., Aug. 17-19, 1919. Kansas: 9 , Blackjack Creek, Pottawatomie 

 Co., July 3, 1953 (Evans and party) ; 9 , Cheyenne Co., 3300 ft. (F. X. Williams) ; 

 9, Douglas Co., 900 ft. (F. X. Williams); 9, Ellis Co., 2000 ft., July 19, 1912 

 (F. X. Williams); 9, Rowlins Co., 2850 ft.; 9, Rooks Co., 1775 ft., Aug. 9, 

 1912; 39 9, 3 cTcf, Scott City, July 1929 (V. F. Corkins) ; 9, Scott Co., 



