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AQUATIC INSECTS IN NEW -YORK STATE > 457 
length of the pupal stage has not yet been exactly determined, 
but the period is probably not longer than two weeks. Walsh 
and Weed both mention C. rastricornis, as being found 
under bark of the upper side of logs floating in water. They 
were doubtless there to pupate. Weed speaks of the pupa stage 
of that species as lasting eight days in one case and 14 days in 
another case. H. L. Moody [1878] notes that a specimen of 
©. pectinicornis spent 12 days in the pupa stage. 
The pupae are quiescent but can crawl when disturbed. The 
color is at first light brown but becomes dark before the emer- 
gence of the adult insect. As in the case of Sialis and Corydalis, 
the pupae very much resemble the adults in many points of 
external structure. Walsh says of pupae of C. rastri- 
cornis, that at least the female has two robust obtuse ab- 
dominal appendages, about 2mm long, confluent at base; and 
an inferior process of two similar ones, connate throughout. 
The adults are better fliers than Sialis, but are still very awk- 
ward and are not difficult to catch. They are chiefly crepus- 
cular, but often fly in the late morning, and are easily frightened 
from their diurnal hiding places along a wooded stream. Speci- 
mens taken to cages have all died in a very short time, and it 
is probable that the life in the winged state is only a few days. 
They have not been known to take food in this state. 
Adults of GC. serricornis have been collected at Ithaca: 
from June 9 to 18 in various years. 
KEY TO SPECIES OF CHAULIODES 
@ Wings black or brown with white markings 
b A continuous, broad, somewhat arcuate white 
band extending across the middle of each wing 
almost attaining the hind margin of each; an- 
tennae serrate in the female, flabellate in the 
eT SO to oe ane eee 1 fasciatus 
bb An irregular band of white spots, generally 
broadest in front, extending across the middle 
of each front wing, on the hind wing repre- 
sented by only a few minute dots which may 
be wanting; antennae more or less serrate in 
PMMA Gre ieras Giles es cceeusesenere SOPELCOrBRIB 
