IX THE ANTEiN'N.E AND PALPI OF DIPTERA. 69 



EXPLANATION OF THE PLATES. 



Except where otherwise stated, all the sections are through the third joint 

 of the antenure. 



Explanation oi? Lettering: — Ap., aperture of pit; jB., base of hair; C, cells; 

 C/i., chitin: if., hairs; iV., nene; i\rM., nuclei ; /S/;., sensory process or seiisillus ; 

 T., top of second joint of antenna?. 



Plate I. 



Fig. 1. Part of a transverse section of the antenna of Eristalis fenn.v. X 600. 



2. Transverse section of the antenna of JSrisfalis tenax, showing the "simple" 



pit. X 128. 



3. Transverse section of antenna of Xylota sj/luariuii. X 128. 



Plate II. 



P'ig. 1. Transverse section of the antenna of GVr7//^j/iocrt cvythrocephala. X 600. 



5. Longitudinal section of the antenna of C. erythvoccphala. X 600. 



6. Transverse section of tlie antenna of the same insect. X 128. 



Plate III. 



Fig. 7. Transverse section of the antenna of TMcilia sericata. X 980. 



8. Longitudinal section of the antenna of the same insect. X 600. 



9. Transverse section of the antenna of Fhormida coerulea. X 6J0. 



Plate IV. 



Fig. 10. Transverse section of the antenna of Folleuia riulis. X 600. 



11. Transverse section of the antenna of Sarcoplutcja caDiaria. X 600. 



12. Transverse section of the antenna of an undetermined Tachinid sp. X 600. 



