SPECIAL SENSE ORGANS 17 
the female at mating season. Minute structures found in the antenne 
and the maxillary palpi are commonly the seat of the olfactory sense. 
All insects have more or less specially developed parts for exercising 
the sense of touch. The antenne, or “ feelers,” are primarily adapted 
to serve this function, but hairs or bristles connected with sensory 
nerves occur at various places over the body. This would be expected, 
since the body is so completely covered with its armor of chitin. 
