430 N. E. MCINDOO. 



2 worked antennae. i moved antennae. 



2 jumped slightly. 



Reaction time 3 to 60 seconds, average 21.8 seconds. 



Parts of decayed beetles: 



7 moved slightly. i moved legs. 



5 did not respond. i worked antennae. 



4 moved away quickly. i vibrated legs. 



3 moved away slowly. i vibrated antenna and worked 

 2 jumped slightly. mouth parts. 



Reaction time 5 to 60 seconds, average 28.1 seconds. 



The general average reaction time of the 25 beetles tested 

 to the six odors is 16.5 seconds. As a possible reason why one 

 fifth of the individuals tested failed to respond to the odor 

 from the decayed beetles is that these insects probably do not 

 respond to decayed matter unless they are hungry. The 25 

 beetles tested were put into a wooden box four inches wide, 

 seven inches long and two inches deep. One half inch of moist 

 earth was also put into the box. The beetles soon buried in 

 the earth and from that time on they appeared quite "at home." 

 The box was put into a table drawer where it was more or less 

 dark. About twice each week water was poured upon the earth 

 and the beetles were fed earthworms and various insect larvae. 

 They drank some of the wate- and always greedily ate the food 

 given to them. Up to the time of this writing (Jan. 15), 24 

 of these beetles have died. These lived from 18 to 180 days with 

 61 days as an average. All the beetles confined in the laboratory 

 have not been fed since Oct. 15, but they have been given water 

 once or twice a week. A few of the dead beetles when removed 

 from the box had been partially eaten, but these insects were 

 never seen fighting one another. While collecting this species 

 in the corn field, a dead one was now and then found. 



(a) Effects with AntenncB Pulled Off. 



The antennae of 25 Harpalus pennsylvanica were pulled off at 

 their bases. These insects were then put into a wooden box 

 similar to the one containing the unmutilated individuals just 

 described. This box, also containing moist earth, was placed 

 into the table drawer. The beetles appeared normal in all 

 respects for they drank and ate as greedily as the unmutilated 



