1911] Cockerell—Bees of the Genus Perdita 135 



1896, p. Q'i. Robertson has described P. boltonicE (1902) 



as a Perditella. 

 Pentaperdita Cockerell and Porter. Type P. alhovittata. Max- 

 illary palpi 5-jointed; claws all cleft in males; simple in 



females. 

 Tetraperdita Cockerell and Porter. Type P. sexmacnlata. 



Maxillary palpi 4-jointed; claws cleft in male, simple in 



female. 

 Geoperdita Cockerell and Porter. Type P. chamocsarachoB. 



Maxillary palpi rudimentary; labial palpi 3-jointed. 

 The last three, which should probably rank as genera, were 



described in Annals and Mag. of Nat. History, December, 



1899, p. 415. 



Tables. 



(1) Cockerell, Proc. Acad. Nat. Sci., Philadelphia, 1896, pp. 45-52. 



(2) Cockerell, Bull. Sci. Lab., Denison University, XI, pp. 52-59. (Species of 

 New Mexico.) 



(3) Cockerell, University of Colorado Studies, 1907, p. 247. 



(4) Cockerell and Porter. Ann. and Mag. of Nat. History, December, 1899, 

 pp. 414-415. (Table of measurements of labial palpi.) 



(5) Cockerell, Entom. News, December, 1905, p. 331. (Species resembling P. 

 xanthismcc.) 



(6) Cockerell in Viereck, Entom. News, January, 1904, p. 22. (Yellow species.) 

 After each name is given the type, locality, and the collector of the type, if known. 



List of Species. 



Aeneifrons Cockerell 1896. Las Cruces, New Mexico (Cockerell). 



Tab. 1, 2, 4. Visits Isocoma. 

 Affinis Cresson 1878. Colorado (Ridings). Tab. 1, 2, 3, 4. Visits 



Compositoe. 

 Albipennis Cresson 1868. Between Fort Wallace, Colorado, 



and Fort Craig, New Mexico. (S. Leivis.) Tab. 1, 2. 



Visits Helianthus. 

 Albipennis helianthi Cockerell 1896. Las Cruces, New Mexico 



(Cockerell). Tab. 1, 2. Visits Helianthus. 

 Albipennis lingualis Cockerell 1896. Fort Collins, Colorado 



(Baker). A female variant. 

 Albipennis pasonis Cockerell 1896. El Paso, Texas (Cockerell). 



A form approaching P. verbesinoe. 

 Albovittata Cockerell 1895. San Augustine, New Mexico (Cock- 

 erell). Tab. 1, 2, 4. Visits Ximenesia. 



