. The Canadian entomologist. Insects; Entomology. 58 THE CANADIAN ENTOMOLOGIST when observed close at hand, is se'en not to be a continuous steady flash, but a series of very rapid pulsations, or a flash of very rapid variations in intensity, such as may be observed in a moving mirror image of an arc-lamp operation on alternating current. (See diagram). As compared with the phenomenon of the alternating. 1. Pyractomena borealis. 2. Pyractomena angulata. .3. Pyractomena iucifeia. 4. Photinus pyralis. o. Photinus consanguineiis. 6. Photinus scintillans. 7. Pnotinus marginellus. S. Photinus castu
. The Canadian entomologist. Insects; Entomology. 58 THE CANADIAN ENTOMOLOGIST when observed close at hand, is se'en not to be a continuous steady flash, but a series of very rapid pulsations, or a flash of very rapid variations in intensity, such as may be observed in a moving mirror image of an arc-lamp operation on alternating current. (See diagram). As compared with the phenomenon of the alternating. 1. Pyractomena borealis. 2. Pyractomena angulata. .3. Pyractomena iucifeia. 4. Photinus pyralis. o. Photinus consanguineiis. 6. Photinus scintillans. 7. Pnotinus marginellus. S. Photinus castus. 9. Photinus pennsylvanicus. Pig, 6.—Chart showing relative intensities and durations of flashes of American Lampyridae. d cm. vertically equals approximately candle power; 1 cm. horizontally equals approximately one second in length of curves; space between curves representing flashes of male and female of same spscies, is arbitrary. current arc-lamp, the "frequency" appeared to be about 50 per second, rather slower than the lamp (60 cycles). One insect flash- ing thus was caught on the evening of May 27, and found to be a female, but at this time, none could be attracted to the electric light, bv imitating either this flash, or that described in the preceding. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Canada (1863-1871); Entomological Society of Canada (1951- ); Entomological Society of Ontario. Ottawa [etc. ] Entomological Society of Canada [etc. ]
Size: 1174px × 2129px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubje, booksubjectentomology
