20 THE PHYSIOLOGY OF INSECT SENSES 



marks the point of attachment. In special cases they are associated 

 with a tympanic membrane. They all possess in the region of the 

 dendrite a cuticle-like sheath, usually ribbed, and in the majority of 

 cases capped with a prominent refractile body. Because of the 



Fig. 13. a sensillum basiconicum from the antenna of a grasshopper. N, 

 bipolar neuron; S, scolopoid sheath ; A, axons ; D, dendrites. (Redrawn 

 from SHfer^/^/., 1959.) 



resemblance of the combined sheath and cap to a peg-shaped rod, 

 the structure has been termed the scolops (Stift). A terminal strand 

 may or may not extend from the cap distally to the point of attachment 

 on the body wall. 

 There is no completely satisfactory name to apply to these sensilla. 



