160 BRITISH BEES. 



Section 2. CenoUtes (Dwellers in Community). 



Subsection 1. Spitehed, 



■]• FarasUical. 



Genus 25. Apathus. 



■ff Collectors. 

 Temporarily social. 



Genus 26. Bombus. 



Subsection 2. Unspueeed. 

 Permanently social. 



Genus 27. Apis. 



The primary division of the bees into two large 

 branchesj viz. into the AndrenidtB, or abnormal bees, 

 and the Apidee, or normal bees, is efiected by the mode 

 in which they fold the cibarial apparatus in repose. 

 In the description of the structure of the imago, I have 

 enlarged upon these organs, and for their explanation I 

 must refer to that chapter where diagrams exhibit the 

 structure of the different kinds of trophi of the bees, as 

 well as their mode of folding. Here it is only necessary 

 to notice that in the Andrenidae, the joint at the base 

 draws back the basal portion when protruded, and this 

 basal portion is further jointed at the point of the in- 

 sertion of the paraglossse and labial palpi, and parallel 

 with which joint the maxillae are likewise jointed close 

 to the sinus where the maxillary palpi are inserted 

 laterally upon it. The basal portion thus throws the 

 anterior part forward or retracts it, at the will of the 

 insect, and in the latter case, being then in repose, it lies 

 in contiguous parallelism to the basal half, but beneath 

 it. When thus withdrawn, the short tongue itself, with 

 its paraglossse and labial palpi are sheltered beneath the 



