1911] Cockerell—Bees of the Genus Perdita 139 



(Swenk). Visits Helianthus. Allied to P. alhipennis. Also 

 in Colorado. 



Larreae Cockerell 1896. San Marcial, New Mexico (Cockerell). 

 Tab. 1,2,4, 6. Small orange-yellow species ; visits Covillea. 

 Although several species of Perdita are dependent on Covillea, 

 the plant can exist without these bees, as is shown by its 

 occurrence in South America, where Perdita is absent. 



Larreae modesta Cockerell 1897. Mesilla Park, New Mexico 

 (Cockerell). Tab. 2, 6. Head of male not nearly so large. 

 Visits Covillea. 



Larrearum Cockerell 1896. San Marcial, New Mexico (Cock- 

 erell). Tab. 1, 2. Visits Covillea. 



Laticeps Cockerell 1896. Las Cruces, New Mexico (.-1. M. Holt). 

 Tab. 1, 2. Visits Ximenesia. 



Laticincta Swenk and Cockerell 1907. Glen, Sioux Co., Nebraska 

 (H. S. Smith). Visits Helianthus. 



Lepachidis Cockerell 1896. Santa Fe, New Mexico (Cockerell). 

 Tab. 1, 2. Very close to P. alhipennis. Visits Ratibida. 



Lepidii Cockerell 1907. Florissant, Colorado (Rohwer). Visits 

 Lepidium. 



Luciae Cockerell 1899. S. Jose de Guaymas, Mexico (Howard). 

 Flies in April. Allied to P. martini. 



Luteiceps Cockerell 1896. Glenwood Springs, Colorado (Gillette). 

 Tab. 1. Flies in August. Related to P. martini. 



Luteola Cockerell 1894. Las Cruces, New Mexico (Cockerell). 

 Tab. 1, 2, 4, 6. A yellow species, visiting Isocoma and Guti- 

 errezia. Also occurs in Nebraska. 



Maculigera Cockerell 1896. Las Cruces, New Mexico (Cocker- 

 ell). Tab. 2. Visits Sa/ia; in May. (Ent. News, 1896, p. 255.) 



Maculipennis Graenicher 1910. Milwaukee, Wisconsin, August 

 (Graenicher) . Stigma with a black spot. 



Maculipes Cockerell 1896. Las Cruces, New Mexico (A. M. 

 Holt). Tab. 1, 2. Visits Isocoma. Very close to P. bigelovioe. 



Marcialis Cockerell 1896. San Marcial, New Mexico (Cocker- 

 ell). Tab. 1, 2. Visits Covillea. Related to P. larreoe. 



Martini Cockerell 1895. Las Cruces, New Mexico (Cockerell). 

 Tab. 1, 2. Flies in April. 



Maura Cockerell 1901. Cedar Bluffs, Nebraska (Bruner). Visits 

 Physalis, and sometimes Aster. 



