62 



MR. K. M, SMITH ON CERTAIN SENSK-OBGANS 



bairs at the opening and the sboi"t strong sensory processes 

 very wide at the base. 



PI. III. fig. 9, a photomicrograph of the antenna of Phormia 

 coerulea {=^grainlandia) cut near the junction of the second and 

 third joints, illustrates the nerve and the variations in shape of 

 the sensory processes. PI. III. fig. 8, a photomicrograph of a lon- 

 gitudinal section through the antenna of the same insect, shows 

 the position of the sense-pits ; they are clustered together at the 

 end of the under surface nearest the bead and are eleven in 

 number. 



PI. lY. fig. 10, a photomicrograph of a transverse section of 

 the antenna of Pollenia ruclis : one pit is visible. The third joint 

 appears to be reinforced in the centre by a strong band of chitin 

 running parallel to the outer walls, which appears black in the 

 photograph. 



A form which I have not examined, but in the antennae of 

 which funnel-like pits have been described (see Deegener (10) ), 

 is Mtoscina stahula7is. 



Text-fisrure 39. 



Part of a transverse section of antenna of Mesemhrina meridiana. X 600. 



Text-fig. 39 shows a pit in the antenna of another Muscid, 

 Mesemhrina vieridiana L. (C. G, Lamb det.). It illustrates the 



