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TEXT-BOOK OF ENTOMOLOGY 



those of the locust (Caloptenus) and many Hymenoptera. They 

 are situated usually on the third antennal joint. Pachyrhina pra- 

 tensis L. has about 60 of them, as have Tipula oleracea L. and 

 Ctenophora. 



In the Lepidoptera, olfactory pits are much like those of flies. 

 Hauser describes in detail those of Vanessa io. Those of the moths 

 were not examined, but they can be readily 

 and satisfactorily proved to be the site of the 

 olfactory sense. 



FIG. '273. Longitudinal section through the third antennal 

 joint of a fly (Cyrtoneura stabulanx). showing the compound 

 pits from above and in section. After Hauser. 



Fio. 274. Antenna of Ade- 

 lops. showing the olfactory organs 

 (p) in the five last joints." 



Historical researches in respect to the Coleoptera generally gave a 

 very unfavorable result, contrary to Lespes's views. That author 

 states that in the Carabidae the pits are found on the four first 

 joints, but Hauser could discover them in none which he examined. 

 Usually only tactile bristles occur, so also in the Cerambycidse, Cur- 

 culionidse, Chrysomelidse, and Cantharidse. In a blind silphid beetle 



