August, ’18] 
PARKER: CHLOROPISCA GLABRA HABITS 
377 
Description of Larva 
The larva when full grown averages 6.5 mm. in length when alive in normal posi¬ 
tion. After being killed by dropping in hot water the body becomes distended and 
averages 7.2 mm. in length. From its greatest width of .7 mm. at the ninth and tenth 
segment, the body tapers to .5 mm. at the posterior end and to .2 mm. at the anterior 
end; it is sharply truncated posteriorly; segmental divisions are marked by faint 
transverse striae. The anal spiracles are prominent, extending 1 mm. above body 
surface, three armed, each arm having a distinct opening. Anterior spiracles smaller, 
only slightly raised above surface of body, seven branched. Connecting the anterior 
and posterior spiracles are two large tracheal trunks, which can be easily seen through 
the body wall, and which are bridged by a cross trunk on the last body segment. 
The black cephalo-pharyngeal skeleton consists of two heavily chitinized rods ending 
in sharp, strongly curved hooks. A joint in the rods just behind the base of the hook 
allows freedom of motion. 
In color the larva varies from white to a very pale yellow, depending somewhat on 
the contents of the alimentary canal. 
Pupation 
The first signs of approaching pupation are inactivity and a shorten¬ 
ing of the body. The larval skin is not shed but becomes the outer 
covering of the puparium. When the puparium is first formed it 
is white in color and through its transparent wall the tracheal trunks 
can still be seen. In a short time the color changes to yellow, then to a 
light tan and finally to a deep brown. Pupation is completed about 
36 hours after the larva begins to shorten. 
Length of Pupal Period 
The pupal period generally extends from some time in August or 
September until the following May, a period of about nine months, but 
a few individuals may emerge during the same season in which the 
puparia are formed, remaining in the pupal stage only two or three 
weeks. The following table shows the length of the pupal stage in 
five overwintering and five fall-emerging puparia: 
Table V. Showing Length of Chloropisca glabra Pupal Stage 
Serial number 
Pupated 
Emerged 
Length of pupal stage 
1 
Aug. 17 
May 29 
282 days 
2 
Aug. 13 
May 28 
285 days 
3 
Aug. 15 
June 2 
287 days 
4 
Aug. 12 
June 3 
291 days 
5 
Aug. 13 
May 29 
286 days 
6 
Aug. 14 
Aug. 30 
16 days 
7 
Aug. 14 
Aug. 31 
17 days 
8 
Aug. 9 
Aug. 29 
20 days 
9 
Aug. 13 
Aug. 31 
18 days 
10 
Aug. 12 
Sept. 1 
20 days 
