THE OLFACTORY SENSE OF COLEOPTERA. 437 



blood exuded from each wound. The beetles were kept in a 

 small box filled with moist rotten wood. 



(a) Effects ivith Antennce P idled Off. 



Two days after pulling off the antennae, the four preceding 

 mutilated beetles were again tested with the same odors. They 

 were more quiet than before being mutilated. Their responses 

 were just as prompt but were less pronounced than before they 

 were mutilated. Their most common response was to work the 

 mouth parts and to move away slowly. The general average 

 reaction time to all six odors is 3.3 seconds. They lived from 

 4 to 20 days with 12.5 days as an average. 



SCARAB^ID^. 



The Olfactory Sense of Cotinis nitida. 

 One lamellicorn beetle {Cotinis nitida) was tested with the six 

 odors. The most common response was to stretch out its head, 

 and to move its antennae and front legs. Once it drew in the 

 antennae and moved the front legs. The average reaction time 

 is 8 seconds. The antennae were pulled off at their bases. A 

 small drop of blood exuded from each wound. 



(a) Effects luith Antennce Pulled Off. 

 A day after pulling off the antennae, the preceding Cotinis 

 nitida was again tested with the same odors. It responded as 

 promptly as before being mutilated. The most common re- 

 sponse was to work the mouth parts and to move away slowly. 

 The average reaction time is 8.3 seconds. It lived 12 days after 

 being mutilated. 



The Olfactory Sense of Euphoria sepulchralis. 

 Five lamellicorn beetles {Euphoria sepulchralis) were caught 

 on goldenrod {Solidago). While being tested with the odors 

 from the three essential oils, they were extremely restless. 

 They generally moved away slowly and drew in the antennae 

 when tested with an odor. The general average reaction time 

 is 3.6 seconds. After the antennae had been pulled off at their 

 bases, the beetles were put into the cage described on page 436. 



