WHEN the subject of the phosphorescence of the Lampyridae came under discussion at the meeting of ths Entomological Society of London on February 4, 1880 (Proc. Ent. Soc., 1880, p. iii.) Mr. Meldola stated that “Some years ago he had examined the spectrum of the glowworm, and found that it was continuous, being rich in blue and green rays, and comparatively poor in red and yellow.” This substantially confirms the observation of Sir John Conroy, although Mr. Meldola gives no measurements.