1911] Cockerell—Bees of the Genus Perdita 137 



Callicerata chrysoceras Cockerell 1897. Near Las Criices, 



New Mexico {Cockerell). Tab. 2. 

 Callicerata leucura Cockerell 1909. Mesilla, New Mexico 



(Cockerell) . Perhaps a hybrid, callicerata X pallidior. Visits 



Bailey a. 

 Cambarella Cockerell 1906. Paris, Texas, August 26 (Bishopp). 



Visits Heterotheca. Allied to P. mellina. 

 Canina Cockerell 1895. Santa F6, New Mexico {Cockerell). 



Identical with P. zebrata. 

 Cephalotes Cresson 1878. Nevada {Hy. Edicards). Tab. 1. 



Head of male very large. 

 Chamaesarachae Cockerell 1896. Albuquerque, New Mexico 



{Cockerell). Tab. 1, 2, 5. Visits Chamoesaracha. 

 Chrysophila Cockerel! 1896. Organ, New Mexico (Cockerell). 



Tab. 2. Visits Ximenesia and Hymenoxys. 

 Citrinella Graenicher 1910. North Hudson, Wisconsin (Grae- 



nicher). Allied to P. perpallida. Visits Petalostemon. 

 Cladothricis Cockerell 1896. Las Cruces, New Mexico (Cock- 

 erell). Tab. 1, 2. Visits Cladothrix, and sometimes Pedis, 



Isocoma and Gutierrezia. 

 Claypolei Cockerell 1901. Mt. Lowe, California (Cockerell). 



Visits Eriogonum polifolium. 

 Cockerelli Crawford 1906. West Point, Nebraska (Craivford). 



Visits Grindelia and also Solidago. Resembles P. hruneri. 

 Coreopsidis Cockerell 1906. Cotulla, Texas, May 5 (W. D. 



Pierce). Visits Coreopsis. 

 Crassiceps Cockerell 1896. Albuquerque, New Mexico (Cocker- 

 ell). Tab. 1, 2. 

 Crawford! Cockerell 1901. Lincoln, Nebraska (J. C. Crawford). 



Visits Grindelia. 

 Crotonis Cockerell 1896. Albuquerque, New Mexico (Cockerell). 



Tab. 1, 2. Visits Croton. 

 Dallasiana Cockerell 1906. Dallas, Texas, July (W. W. Yothers). 



Visits Helianthiis. Runs in tables to vicinity of hirsuta. 

 Dasylirii Cockerell 1907. Alamogordo, New Mexico, June 



(Viereck). Visits Das ylirion. AWied to P. lucio'. 

 Dolichocephala Swenk and Cockerell 1907. Warbonnet 



Canon, Nebraska (Carriker). Visits Heliantkus. Peculiar 



for its long head. 



