438 N. E. MCINDOO. 



(a) Effects with Antennce Pulled Off. 

 A day later the five preceding mutilated insects were again 

 tested with the same odors. They were quiet and their responses 

 were similar to those before being mutilated, except, of course, 

 there were no antennal movements. The general average re- 

 action time is 4.3 seconds. These beetles lived from 9 to 42 • 

 days with 20 days as an average after being mutilated. 



CERAMBYCIDyE. 



The Olfactory Sense of Cyllene rohinice. 

 Eighteen wood-boring beetles {Cyllene rohinice) were caught on 

 goldenrod (Solidago). While being tested with the odors from 

 the three essential oils, they were extremely restless. When 

 tested, most of them moved away quickly; a few arose quickly, 

 and a few vibrated the antennae. The general average reaction 

 time is 5.4 seconds. These beetles were confined in the cage 

 described on page 436. They were regularly given a fresh supply 

 of goldenrod. They seemed "at home" and copulated as freely 

 in the cage as they do out-of-doors. They lived from i to 17 

 days with 10.4 days as an average. 



(a) Effects with Antennce Pulled Off. 

 Eighteen more Cyllene rohinice were collected from goldenrod. 

 Their antennae were pulled off at the bases. A small drop of 

 blood exuded from each wound. These beetles were placed into 

 the cage with the unmutilated ones. Two days later the 15 

 remaining live ones were tested with the odors from the essential 

 oils. They were very quiet and their responses were similar to 

 those of unmutilated individuals, except as a rule they were more 

 prompt. The general average reaction time is 3 seconds. In 

 the cage it was common to see the unmutilated and antennaeless 

 cerambycids copulating. The former were very active and flew 

 out of the cage whenever the door was opened, but the latter 

 seldom flew and they were not so active. The mutilated ones 

 lived from i to 1 1 days with 5 days as an average. 



(&) Effects with Elytra and Wings Pulled Off. 

 Eighteen more Cyllene robinicB were collected. Their elytra 

 and wings were pulled off at the articulations. A small drop 



