ELISHA MITCHELL SCIENTIFIC SOCIETY. 93 



to ninth segments inclusive (ventral surface) are one pair each of 

 small, elongated, black clots, corresponding very nearly in posi- 

 tion with the pairs of luminous organs of the ventral surface. 

 Anal proleg blackish-brown above, yellowish-white below. 



Besides the stigmata on the fourth to eleventh segments, there 

 is one on the ventral surface of each anterior corner of the meso- 

 thoracic segment; also two pairs of small dorsal spiracles, one 

 each between the fourth and fifth, and fifth and sixth segments. 



Thoracic legs brown, suffused with yellowish-olive. Tarsus 

 two-jointed; single claw curved. Anterior edge of femur with 

 a row of short hairs; under edge of tibia and first joint of tar- 

 sus with a similar row of hairs; under edge of last joint of tar- 

 sus with small, short papillae. Head black, 2| mm. in width, 

 retractile. Mandibles curved, sickle-shaped, black. Antennae 

 four-jointed: labial palpi two-jointed (or three-jointed? Those 

 of a larva collected in July appear three-jointed): maxillarv 

 palpi four-jointed. 



The location and form of the phosphorescent lights are as 

 follows: On each side is a row of circular ones, one on each seir- 

 ment from the second to the twelfth inclusive. Each of these is 

 nearly one-eighth inch in diameter, and situated in the posterior 

 end of the upper longitudinal fold. The posterior edge of each 

 segment, from the second to the twelfth inclusive, emits a band 

 of light. On the under surface are five pairs mere points, one 

 I)air each on the fifth to ninth segments. The general appear- 

 ance is that of a worm beautifully illuminated with bluish-white 

 lights, which are disposed in a longitudinal row on each side, and 

 in transverse bands. 



The insect was placed in a small, elongated vial, so that I 

 might ea.sily observe and exhibit the display of lights. The light 

 was brilliant until 11 p. m. on the night of September 27. At 2 

 A. M. on the 28th the phosphorescence had disappeared. It did 

 not appear again until the night of the 30th, when, by disturb- 

 ing the insect, the lights began to glow, but continued only for a 

 few hours. For a few nights, within the space of a week, I 

 observed that the insect glowed only when disturbed. After that 



