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IX. The mature Larva and Pupa of Catochrysops phasma 
Butl. (Lycaeninae). By Dr. T. A. CHapman, 
M:D., F.R.S. 
THE larva preserved in spirit of C. phasma has the colourless 
aspect of a hidden feeder (like Lycaena arion L., which is 
pale flesh-colour), Length—14 mm.; width mesothorax 
—4:5; 4th abdominal segment—5-0; 7th abdominal— 
4-5. Has the appearance of being distended, with seg- . 
ments approximately circular in transverse — section. 
Ventral surface straight from 2nd thoracic to posterior 
end; prothorax a little projecting ventrally and head (on 
a neck) projecting ventrally 1-3 mm. Dorsum is curved, 
from front of prothorax, which is a little below the ventral 
line (of median segments), rising quickly over prothorax, 
then in a regular sweep, highest, of course, over 4th 
abdominal segment, with quite a hump over honey-gland 
and then sloping to end of 10th abdominal, which projects 
0-6 mm. behind claspers which are placed nearly 1 mm. 
from the margin of segment towards the mid-ventral line. 
The hinder portion of left side is darkened by some 
disease or post mortem change; the rest is of a very pale 
flesh tint, which may, of course, be lighter or darker than 
that during life. There are small brownish patches a 
little way above prolegs (not quite a third of the way to 
spiracles) : these brownish areas are roundish and wrinkled, 
and a little depressed centrally and, though uncoloured, 
exist on segments forward to mesothorax. 
The spiracles have a somewhat dorsal position and are 
brownish. There is a fringe of short hairs on anterior 
margin of prothorax and at extremity of last segment. 
The general surface looks glabrous, but there exist single 
hairs below the spiracles and possibly elsewhere (on primary 
tubercles ?), and the general surface shows the skin-points 
as minute hairs. The prolegs have each two pads (almost 
united), carrying black crochets, 8 on the anterior and 
7 on the posterior, in two rows, alternating but all of same 
size; there is also the usual separate central pad. The 
true legs are small (about 0-5 mm. long) and black, but 
brown “when mounted and seen by transmitted light. 
They have at their bases a few short hairs, and just above 
each is a patch of hairs of which two are about 0-6 mm. 
long, four or five shorter and a few others graduating 
down to the ordinary skin-point hairs. 
TRANS. ENT. SOC. LOND. 1921.—PARTS III, IV. (JAN. °22) 
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