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EXPLANATION OE THE PLATES. 



All the drawings of the tongues were made from specimens 

 of those organs when recently extracted from fresh specimens of 

 the Bees, before any of the parts became distorted by shrivelling 

 up, as is the case in dried specimens. 



The letters indicate the same parts in all the figures ; they are 

 as follows : a, the mentum ; b, labium ; c, the labial palpi ; d, the 

 paraglossse ; e, the maxilla ; f, the lobe of the maxilla ; g, the 

 maxillary palpus. 



PLATE A. Fig. 1. 



a. The costal nervure. h. The radial uervure. 



b. The apical margin. i. The cubital nervure. 



c. The posterior margin. k. The discoidal nervure. 



d. The post-costal nervure. I. The subdiscoidal nervure. 



e. The externo-medial ner- m. The transverso-medial 



vure. nervures. 



f. The anal nervure. n. The recurrent nervures. 



g. The transverso-medial ner- o. The stigma. 



vure. 



PLATE A. Fig. 2. 



1. The costal cell. 8. The third submarginal cell. 



2. The externo-medial cell. 9. The fourth submarginal 



3. The interno-medial cell. cell. 



4. The anal cell. 10. The first discoidal cell. 



5. The marginal cell. 11. The second discoidal cell. 



6. The first submarginal cell, 12. The third discoidal cell. 



7. The second submarginal 13. The first apical cell. 



cell. 14. The second apical cell, 



M2 



