Article beginning on page 309.
Psyche 3:309, 1880.

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ments, being timer on one, middle they diverge nearly from their origin ; on the next, and outer on the third ;
between the first body-ganglion and the
but a portion of the hi ner remains inner suboesophageal ganglion the cordsarcpar- throughout.
allel, but separate, and a little parted in Dtqestive system. The salivary glands the middle. The third ganglion lies in the .ire 4 mm. long, flat and simple, bent
middle of its segment, the fourth at the abruptly outward beyond the middle, anterior edge of its segment, and only ' tapering slightly and regularly to a 0.75 mm. from the third; the fifth in the bluntly rounded tip.
middle of the anterior half of its aeg-
The malpig11ia.n vussels originate in
meut : the eleveuth ganglion ia consider- an oval gland or sac, 0.45 mm. long and
ably longer than broad, and the pair of
0.2 mm, broad, a abort distance beyond
posterior, backwardly directed, diverging which the under branch is thrown off and nerves is larger than any of She others, immediately afterward the two others.
and may be looked upon as the continua-
The under branch passes forward in tion of the connecting cords between the a straight and not a tortuous course, and other ganglia.
is proportionally about as long as in Glandular system. The basal thread h i s ; the upper branch extends for- of the silk vessels is straight and not ward for a distance of 3.75 mm. ; the tortuous ; the basal half of the stouter '
lateral to tine point where the silk vessels vessel is flattened ; it extends backward bend, 7 mm. from its origin.
as far sa the third abdominal segment
Nerwus system. The cephalic lobe8 and then tin'us abruptly, with a slight are globular. The cords connecting the
forward curve, to the upper side of the
second and third body-ganglia iim to- body, where it contiaues in a straight gether for nearly one-quarter the distance line as far, apparently, as the end of the from the secoud backward, then diverge
sixth abdominal segment. The length
considerably, and again converging, enter of the initial thread or duct is 3.25 mm. ; the third ganglion afcaperceptible distance of the portion of the ribbon or vessel upon apart; nearly the same is repeated be-
the under surface 4 mm. ; of that upon
tween the first and second ganglia, but
the upper surface 5.25 mm.
(To 6e confiuurd (W p. j^y.)
COLOR OF THE LIGHT EMITTED BY INSECTS.
BY HENKY WARUTURNER, ITHACA, S. r.
SOME apec'imens of &vopJiorus wcti- hist., 1848, a. 2, v. 1, p. 200) says they luws Linn., from the West. Indies, that give out a rich yellow-green light when were brought to the Academy of natural
flying and a green light when in captivity. sciences, at Philadelphia, gave out a very Photw-is pensylva'inca gives out (some- bright-green light from the two dorsal
times atleast) a very decided green light, prothoracic spots, and also from the and Photinus pyrdt,S a yellow light from ventral ~iirface near the base of the ab- the ventral surface of the two or three domen. Gosse (Ann. and mag. nat. last segments of the abdomen.



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