THE CANADIAN ENTOMOLOGIST 57 



were begun on the above date, using both the naked bulb and the 

 bulb covered with the hand, as just described for Pyractomena 

 borealis, but no evidence of attraction toward the lamp was ob- 

 tained. In view of the fact that the light of this species is rather 

 more greenish than that of the, other local Lampyridse which have 

 been studied (Coblentz, Can. Ent., 1911, vol. 43, pp. 355-360, and 

 previous papers by the present writer) the experiment was tried of 

 covering the bulb of the lamp with a thin leaf. With this modifica- 

 tion of the colour of the light, and by using a long fiash, in imita- 

 tion of that previously described as one of the methods of light- 

 emission of this species, it was found comparatively easy to attract 

 the males so that they would approach the flashed light, but unless 

 the bulb were shaded more as they drew nearer, they appeared to 

 recognize some difference in the light and would fly away again. 

 The response was not entirely uniform, even in t^he early e\ening 

 when but comparatively few were flying; later, when several hun- 

 dred insects might be within the range of the flash, a definite re- 

 sponse was decidedly the exception, unless a particular, isolated 

 insect near the electric light responded. 



Four distinct types of light-emission on the part of this species 

 were observed, agreeing with those previously reported (Can. 

 Ent., 1910, vol. 42, pp. 358-360). First noted was a series of 

 usually three, though sometimes four or five rapidly repeated 

 flashes of considerable intensity, followed by darkness for several 

 seconds; the flashing thus was repeated at intervals of from not more 

 than three seconds to as much as half a minute. The series of flashes 

 is suggestive of that of the male of Pyractomena luciffra, except 

 that ordinarily not as many separate flashes are given, that there 

 is a distinct interval of darkness between succeeding flashes in the 

 series, and that the flashes in any series appear to be of diminish- 

 ing intensity, (see diagram, Fig. 6). The specimens which ex- 

 hibited this type of flash, came to the lamp when given the long 

 flash described, and were usually, though not always, found to be 

 males. 



The second type of lighting observed was that which the writer 

 has previously described as "a faint glow rapidly increasing in 



brilliancy It then ends suddenly. . . ." The 



only correction to make on this earlier observation is that this flash, 



