233 



EXPLANATION OF 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 i n 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 nervure. h. 



b. The apical margin. i. 



c. The posterior margin. k. 



d. The postcostal nervure. I. 



e. The externo-median nervure. m. 

 f. The anal nervure. n. 

 ff. The transverso-median nervure. o. 



The radial nervure. 

 The cubital nervure. 

 The discoidal nervure. 

 The subdiscoidal nervure. 

 The transverso-median nervures. 

 The recurrent nervures. 

 The stigma. 



PLATE A. 



-Fig. 2. 



1. The costal cell. 



2. The externo-median cell. 



3. The interno-median cell. 



4. The anal ceil. 



5. The marginal cell. 



6. The hrst submarginal cell. 



7. The second subniarginal 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. 

 la. 

 lb. Intermediate leg of Prosopis 



Prosopis comuta 2 



Antenna of Prosopis comuta <$ , 



\c. 



Id. 



2. 



.'5. 



comuta c? . 

 Wing of Prosopis. 

 Head of Prosopis dilatata J . 

 Sphecodes fuscipennis $ , 

 Halictus se.niotatus 9 • 



Fig. 

 3a. 

 3b. 

 3c. 



4. 



5. 



6. 

 6a. 



Labrum of Halictus 

 Labrum of Halictus 

 Wing of Ha/ictus. 

 Mucropis labiata J . 

 Nomad i armata j . 

 Dasypoda hirtipes 2 

 Wing of Dasypoda. 



