ANATOMY AND PHYSIOLOGY 



95 



6. 5. placodeum a membranous plate, its outer surface 

 continuous with the general integument (Fig. 123). Func- 



FIGS. 116-125. 



119 



123 



Types of antennal sensilla, in longitudinal section (excepting Figs. 119 and 120). 

 Fig. 116, sensillum coeloconicum ; 117, cceloconicum; 118, basiconicum; 119, stylo- 

 conicum; 120, chaeticum; 121, trichodeum; 122, trichodeum; 123, placodeum; 124, 

 ampullaceum; 125, ampullaceum; c, cuticula; h, hypodermis; n, nerve; s, sensory celU 

 Figs. 116, 118, 121, 123, 124, honey bee, Apis mellifera; 117, 119, 122, moth, Fidonia 

 piniaria; 120, moth, Ino pruni; 125, wasp, Vespa crabro. After SCHENK. 



