NEW ARRANGEMENT OF BRITISH BEES. 163 



Their peculiar mode of collecting is a further reason 

 for bringing the brush-legged Apidae collectively to the 

 top of the normal bees, in juxtaposition to the Andre- 

 nida, where the transition is made very naturally from 

 Dasypoda to Panurgus. 



The whole of the cibarial apparatus, or trophi, is 

 always complete in all its constituent parts throughout 

 the AndreniddR ; and it is only with Ceratina, in the 

 group of scopuliped Apida, that it begins to show the 

 tendency it has to abnormal deficiencies, by the para- 

 glossse, in that genus, being obsolete. This charac- 

 teristic, then, exhibits itself in the Nudipedes with two 

 submarginal cells who are parasitical upon the Dasy- 

 gasters, in whom also the maxillary palpi participate in 

 a deficiency in the authentic number of their joints, 

 whilst in Apis both maxillary palpi and paraglossse are 

 unapparent. This shows that the numerical completion 

 of the organs of the mouth have nothing to do with the 

 qualifications of the creature, the best endowed in other 

 respects being thus curtailed, the final cause of which is 

 not yet understood. 



The shape of the tongue itself thus separates the 

 Andrenidce into three well-defined divisions readily per- 

 ceptible. These, as I have just observed with respect to 

 the differences in the mode of closing the oral apparatus 

 in both cases, yield no clue to economy and habits, for 

 which observation must supervene to illustrate it. This, 

 patiently carried out, is very desirable, as it is still in 

 discussion whether, notwithstanding the elucidation 

 structure affords, Prosopis and Sphecodes are or are 

 not parasitical. Structure says they are, for, like the 

 cuckoo-bees forming the group Nudipedes in the Apidce, 

 they are destitute of the requisite apparatus for collect- 



M 2 



