158 BRITISH BEES. 



differences in the formation of the tongue, these are cor- 

 roborated by differences in other organs, and the general 

 distribution, as well as the special combinations, all re- 

 sult from natural characteristics. 



The simplicity of the arrangement thus effected is 

 very striking; and we thus find all the bees having 

 similar habits, and with a similar structure united to- 

 gether by it in distinct groups. 



I will here insert my scheme, and exhibit why and 

 in what it differs from those of my predecessors ; and, 

 where necessary, I shall append such observations upon 

 the several methods extant, as will sufficiently show the 

 necessity, and vindicate the introduction of a new one. 



FAMILY MELLICOLLIGEE^ (Honey-collectors). 



Subfamily 1. ANDRENID^ (Subnormal Bees). 



Section 1. With lacerate par aglossce. 

 Subsection a. WITH EMARGINATE TONGUES. 



Genus 1. COLLETES. 

 2. PROSOPIS. 



Subsection b. WITH LANCEOLATE TONGUES. 



&- M^/> Genus 3. SPHECODES. 



4. ANDRENA. &Vs. 



5. CILISSA. 



Section 2. With entire paraglossce. 

 Subsection c. WITH ACUTE TONGUES. 



Genus 6. HALICTUS. tL\t$u 

 & , 7. MACROPIS. 



8. DASYPODA. 



