ANTENNA. 



63 



produced into a prominent forwardly-directed angle. On the 

 inside of the third joint of the antenna near the base a minute 

 though well-marked pore can usually be distinguished, constituting 

 the orifice of a sense-organ (see Fig. 9).* Arista distinctly two- 



Left antenna of Olossina paUidipes, Austen, cJ, from the inner side (X 00) ; 

 p, aperture of sense-organ oti third joint. 



jointed, though basal joint very small ; second joint remarkably 

 V)road throughout its length, flat, tapering somewhat to the tip, but 

 far from being reduced distally to the proportions of a fine haii-, 

 as in the case of the arista of Stomoccys ; feathered on the upper 

 side alone (including the tip) with some twenty-two fine, curving, 



* Dr, Stulilmann [174], writing of GL fusca, Walk,, calls this an 

 " auditory " organ. If the antenna be mounted in glycerine and ex- 

 amined under a low power, the Mense-organ has the appearance of an 

 oval sac. 



