52 PSYCHE. 
segments at that point. Following these 
are seven abdominal segments. The pec- 
tinate antennae and the wing cases are 
seen, and on the propygidium the phospho- 
rescent vesicles are visible as clear greenish 
yellow spots. From the terminal segment 
are two straight processes. The pleural 
region, antennae, and feet distinguish this 
pupa from those of Photinus. The final 
metamorphosis takes place in six days. 
The ¢ form assumed the pupa condition 
one week later than the %. It has two 
white tubercles or small processes on the 
sides of the wing-bearing segments, indi- 
cating the position of the future rudiment- 
ary elytra. The pleural region is different 
from that of the $, and the parts of the 
mouth are not sheathed separately as in 
the %, but are as it were muzzled. An- 
tennae and eyes are not visible; the shield 
seems to consist of two fused segments, as 
seen through the thin membrane. There 
are seven abdominal segments. The whole 
body is of a salmon color. This pupa ma- 
tures in six days and perfects as an apter- 
ous imago with rudimentary elytra. 
Thus we find that under artificial man- 
agement the eggs will mature sufficiently 
to hatch in five weeks, the larva requires 
about seven weeks to reach the pupa stage, 
and the latter lasts only six days, the $ in 
one instance accomplishing its cycle one 
week sooner than the 2. In a few days 
after becoming perfect, the % dies, and the 
?, after wandering a little, lays her eggs 
and dies also. 
Pleotomus pallens % is rare. 
covered by the prothorax. 
dark-purplish, contiguous. Labial palpi 
visible at tip. Maxillary palpi small. 
Mandibles not prominent, very small. An- 
Head 
Eyes large, 
tennae short, approximate, 14-jointed, bi- 
pectinate, usually folded so as to seem uni- 
pectinate, situated in front of the eyes and 
parallel with anterior edge of the prothorax, 
their tips recurved, color fuscotestaceous. 
Prothorax finely punctulate, subhyaline, el- 
evated at its base; its sides beneath em- 
bracing the neck and forming a collar for 
the head when the latter is protruded: it 
is broader than in the ordinary species of 
firefly, fuscotestaceous, with rosy centre 
in some, in others with transverse, irregu- 
lar confluent pink spots on the posterior 
part; the flanks beneath this part are also 
pink. Elytra striate, elevated at their 
base, the concave humeral region em- 
bracing the sides of the abdomen, whence 
the elytra slope backward to a narrow de- 
hiscent point, leaving nearly three segments 
visible. Wings same length as elytra, and 
smoke color. Feet feeble and compressed, 
same color as the body. Seven ventral 
segments short, the last one pointed and 
partly retracted within the penultimate, 
which is emarginate. 
On the last abdominal ring there is a 
spot on the anterior, outer margin of dor- 
sum and venter, seen in the day as of a 
deeper yellow than the surrounding parts. 
Through this at night comes the phosphor- 
escence, not in flashes, but as two oval 
spots, equally evident above and below, 
but more feeble than in any other firefly 
known tome. The % has the same quick 
spasmodic motion noticed in the 2. He 
feeds sparingly on the common garden 
snail, probably on its slime, being, I should 
think, too feeble to be actively aggressive, 
though I have seen him cling to a snail 
shell with much persistency. 
Pleotomus pallens ¢ , though apparently 
v 
