356 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



absent; legs black basally to the apical ends of all femora; fore- and 

 midlegs are creamy white apicaUy except the tarsi, which become light 

 fulvous ; the liindlegs are creamy white on the apical end of the femora 

 and basal half of the tibiae, beyond which they are largely black ; wings 

 subhyahne but sHghtly clouded apically. 



Abdomen black except for a small patch on tergum 1, broad band 

 on tergum 2, narrower and emarginate bands on terga 3, 4, and 5 and 

 a small spot on tergum 6, all of which are creamy white; venter im- 

 maculate ; p3^gidium mth sides sUghtly convex, ends subequal in width 

 and broadly rounded. 



Many of the specimens show the markings more yellow than white. 

 The hghter forms are more common in the Pacific Northwest and in 

 the southv/estem desert area. It is possible subspecies should be 

 recognized. The extent of the Hght markings varies. In some speci- 

 mens spots appear below the wing attachments and on the meso- 

 sternal tubercles. 



The cljrpeal process easily distinguishes the female of acanthophila 

 CockereU from closely related species such asjinitima Cresson. 



Types. — A male of C. acanthophila Cockerell is in the Philadelphia 

 Academy of Natural History, ANSP type no. 10038, from Deming, 

 N. Mex. This is considered the lectotype designated by Cresson in 

 1928. Another male, apparently from the same series, is in the 

 National Museum, Washington, D.C., type no. 3409. A second 

 specimen with a blue ANSP paratype label 10038 is also in the Phila- 

 delphia Academy of Natural History. 



The holotype female and allotype male of C. minax Mickel from 

 Sacramento, CaUf., are at the University of Nebraska. Three para- 

 type females from Auburn, Calif., are also at the University of 

 Nebraska. 



The holotype male of C. huachuca Banks from Patagonia, Ariz., is 

 in the Museum of Comparative Zoology, Harvard University, type 

 no. 27636. 



Distribution. — West of the Continental Divide from British 

 Columbia into Mexico. 



Prey record. — None. 



Plant record. — Achillea (Idaho, Oregon), Achillea millefolium 

 (Oregon), Asclepias mexicana (Oregon), Boerhaavia erecta (New 

 Mexico), Daucus carota (CaHfornia, Idaho, Oregon), Eriogonum 

 (Cahfornia, Idaho, Oregon)^ Eriogonum fasciculatum var. polifolium 

 (California), Foeniculum vulgare (California), Harmizonia fasciculatum 

 (Cahfornia), Helianthus (Idaho), Melilotus (Cahfornia), Melilotus 

 alba (Oregon), Pastinaca sativa (Utah), Rhamnus (California), Salsola 

 kali tenuifolia (Utah), Solidago (New Mexico, Oregon), Tamerix 

 (Utah), Zizyphus lycioides (New Mexico). 



