Plate 



Surface sensilla on the antennae of the blowfly, 



Fig. 1. Longitudinal section through a long thick-walled sensillum and a short, 



blunt thin-walled sensillum ( • 6000). 

 Fig. 2. Longitudinal section through a thin-walled sensillum ( ; 14,000). 

 Fig. 3. Transverse section of five large thick-walled sensilla, one thin- walled 

 sensillum (extreme top right), two stellate sensilla, and numerous non-innervated 



spines ( 4900). 

 Fig. 4. Same section as preceding enlarged to show some details of a stellate 



sensillum. 

 Fig. 5. Transverse section of two thin-walled sensilla and an oblique section 

 of a stellate sensillum. Note the large scolopoid sheath at the base of the latter 



(X 9800). 



