IX THE ANTENNA AND PALPI OF BIPTERA. 



61 



small pit with three sensory processes is shown on the right of 

 the figure. 



Ph II. fig. 4 is a photomicrograph of a transA^erse section 

 of the antenna of Calliphora erythrocephala ; this shows the cells 

 running each to its long, straight, sensory process. PI. II. fig. 6, 

 a transverse section of the antenna of the same insect under a 

 low power, shows one large pit with a number of small ones cut 



Text-figure 38. 



Part of a transverse sectiori of tlie antenna of Mitsca domestica. X 980. 



at different levels and mostly opposite to the large pit. PI. II. 

 fig. 5, a longitudinal section, shows two large pits with their 

 openings and the beginning of a thii-d pit, the large antennal 

 nerve being conspicuous. C. vomitoria was also examined and 

 found to be very similar. For a detailed account of this latter 

 insect, see Rdhler (9). 



PI. III. fig. 7 is a photomicrogi^aph of a transverse section taken 

 under a very high power, of a specimen of Lucilia having the 

 thoracic chsetotaxy of L. sericata ; it shows the long chitinous 



