88 



GUIDE TO CALIFORNIA INSECTS. 



BOMBID/E 



The bumble bees are strictly social insects but the colonies only exist 

 during the summer months. The queen makes a nest in the ground in the 

 spring. The first workers produced are very small. When the colony 

 becomes populous the queen ceases to forage and finally towards fall 

 numerous drones and queens are produced, the latter after mviting seek 

 each a secluded place for hibernation. Psthyrus lives in the nests of bumble 

 bees, and are difficult to distinguish from them. They have no worker cast. 



t:' 



Figure 63. Ceratina. 



Figui'e 60. Observation hive. 



Aphathus californicus — Bombus. 

 Apis fervidus — Bombus. 

 Bombus ambiguus Fra. 



appositus Cr. 



californicus Sm. 



californicus — vosnesenskii. 



centralis Cr. 



columbicus — Bombus vosnesen- 

 skii. 



crotchii Cr. 



dorsalis — Bombus fervidus. 



edwardsii Cr. 



edwardsii — fernaldii. 



edwardsii — rufocinctus 



fernaldii Fra. 



fervidus Fabr. 



henshawi Fra. 

 howardii — occidentalis. 

 huntei Cr. 

 mixtus Cr. 

 morrisoni Cr. 

 nevadensis Cr. 

 nigrocinctus — crotchii. 

 occidentalis Green, 

 rufocinctus Cr. 

 sitkensis Nyl. 

 sonorus Say. 

 suckleyi — Psythyrus. 

 vosnesenskii Rad. 

 Psythyrus californicus — Bombus. 

 crawfordii Fra. 

 suckleyi Gr. 



Ceratina acantha Prov. 



submaratima— acantha 

 dupla Say. 



CERATINID/E. 



gigantea Sm. 

 pacificus Sm. 

 tejoniensis — dupla. 



