THE CANADIAN ENTOMOLOGIST 55 



continuous glow between flashes. The flash of the female — if this 

 may be judged by the specimen seen on bark and assumed to be a 

 female — is a much less intense and slower flash, gi\'en almost im- 

 mediately after the flash of the male she is answering. Represent- 

 ing these in the manner used 1)>" the writer in his review of this sub- 

 ject (Zeitschrift fiir wissenschaftliche Insektenbiologie, 1914, Bd. 

 10, pp. 303-307), the flashes of this species would appear as shown 

 in the sketch. Fig. 1. 



Experiments with a pocket flashlight soon showed that the 

 flying males would pay no attention to the unshielded light, when 

 flashed immediately after their flashes (although the toads in the 

 neighbourhood seemed greatly interested, and could be heard hop- 

 ping toward the experimenter from several directions after each 

 flash!) When, however, the fingers of the free hand were so dis- 

 posed over the bulb as to completely prevent the escape of any 

 direct light, the luminous surface being the portion of the finger 

 tissue through which the light passed, it was found easy to attract 

 flying males from a distance of as much as twent\--five feet, by 

 flashing immediately after the flash of the male. The reaction was 

 so definite as to leave no doubt of the matter; of ten males captured 

 in perhaps fifteen minutes, nine were obtained as the result of at- 

 traction to the experimenter by means of the flash light. For in- 

 stance, a male was observed to be flying in a direction about at right 

 angles to the path which the experimenter was following, and about 

 fifteen feet ahead and perhaps twenty feet in the air. Immediately 

 after he flashed, the shielded lamp was flashed; the flying insect 

 immediately- turned, flying downward and along the line of the 

 path, almost in a direct line for the experimenter's hand. Each 

 time he flashed, the flash was answered, as he drew nearer, and 

 when quite close, he swerved suddenly and alighted on the coat 

 sleeve of the extended hand. One or two of those taken were 

 caught in flight, but most of them were allowed to alight on the 

 coat sleeve, and then captured ; they usually landed at a distance not 

 more than about eight inches from the light, running around rather 

 rapidly after lighting, stopping occasionally and waving the antennae 

 somewhat after the manner of Photiniis pyralis when mating. It 

 is interesting to note that the distinctly red colour of the light 

 from the flash light after passing through the tissue of the experi- 



