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, aU 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 \'indicate the introduction of a new one. 



Family MELLICOLLIGEE^ (Honey-collectors). 



Subfamily 1. Andeenid^ (Subnormal Bees). 



Section 1. With lacerate paraglossw. 



Subsection u. With EMAEGrUATE Tonq-ues. 



Genus 1. Colletes. 

 „ 2. Prosopis. 



Subsection 5. With Lanceolate TouGmss. 



Genus 3. Sphecodes. 

 „ 4. Andrena. 



„ 5. CiLISSA. 



Section 2. Wiili entire paraglossa. 



Subsection c. With Acttte Tongites. 



Genus 6. Halictus. 

 „ 7. Macropis. 

 „ 8. Dasypoda. 



