233 



EXPLANATION OF THE PLATES. 



All the drawing-s of the tongues were made from specimens of those 

 organs -when recently extracted frorn 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 para- 

 glossae ; e, the maxilla ; /, the lobe of the maxilla ; g, the maxillary 

 palpus. 



PLATE A.— Fig. 1. 



a. The costal nemire. 



b. The apical margin. 



c. The posterior margin. 



d. The postcostal nervure. 



e. The externo-median nervure. 



f. The anal nervure. 



a. The transverso-median nervure. 



h. The radial nervure. 

 *. The cubital nervure, 

 k. The discoidal nervure. 

 I. The subdiscoidal nervure. 

 m. The transverso-median nervures. 

 n. The recurrent nervures. 

 o. The stigma. 



PLATE A.— Fig. 2 



1. The costal ceU. 



2. The extemo-median cell. 



3. The internet -median cell. 



4. The anal cell. 



5. The marginal cell. 



6. The first submarginal cell. 



7. The second subrnar°rinal cell. 



8. The third submarginal cell. 



9. The fourth submarginal cell. 



10. The first discoidal cell. 



11. The second discoidal cell. 



12. The third discoidal cell. 



13. The first apical cell. 



14. The second apical cell. 



PLATE I. 



Fig. 



1. Prosopis cornida 2 • 



la. Antenna of Prosopis cojnida tf . 

 lb. Intermediate leg of Prosopis 



cornida c?. 

 lc. Wing of Prosopis. 

 Id. Head of Prosopis dilaiata S ■ 



2. Sphecodes fuscipennis $ . 



3. Halictm sexnotatus § . 



Fig. 



3a. Labrum of Hahctus <$ 

 36. Labrum of Halictus $ , 

 3c. Wing of Halictus. 



4. Macrojns labiata 5 ■ 



5. Nomada armata 5 ■ 



6. Dasypoda hirtipes 2 • 

 6a. Wing of Dasypoda. 



