10 
Psyche 
[March 
bodied forms, but I have found the most satisfactory food 
to be ordinary earthworms. A culture of these may be kept 
in the laboratory for long periods, and one fair-sized worm 
cut in pieces will feed ten or a dozen larvae. 
After about 3 weeks in the laboratory, during which 
they both fed several times, one of these larvae pupated, 
yielding a pupa which resembled the empty pupal shells I 
had previously found. The other was hastily preserved for 
study. I was obliged to leave the laboratory for five days 
after this, and when I returned, found that a male Lepiselaga 
had emerged in my absence, so that the pupal period is not 
more than a week and probably 4 or 5 days. 
The full-grown larva is about 15 mm. long by 3-3.5 mm. 
wide at the widest part in the region of the 5th or 6th seg- 
ment, circular in cross-section, or sometimes slightly flat- 
tened ventrally. In color it is a light yellowish green with 
a complicated dorsal pattern of dark grey spots and blotches 
on the second to tenth segments. Laterally there are two 
short parallel longitudinal dark lines of spots ; below there 
is a dark spot on each of the second to 10th segments. The 
ventral surface is unmarked, as are the first and last seg- 
ments. Both the head and siphon are unusually slender, and 
the anterior part of the body has great powers of extension, 
so that when extended in crawling the head and first two 
segments may make up % of the total length. The loco- 
motory protuberances include a narrow transverse dorsal 
pair, a rounded lateral protuberance on each side, and an 
oval ventral pair. Thus each segment from the 6th to the 
10th inclusive bears 6 protuberances. The 5th segment lacks 
the ventral pair, and the dorsal pair are narrowed. These 
protuberances are extensile to some extent and bear dense 
short hairs. There are also a few long hairs in the head and 
anal regions, and at least a lateral pair on each segment, 
which are difficult to see. The anal region is less swollen 
than in other Tabanid larvae I have seen, and does not appear 
to be used so much in locomotion. The apical part of the 
siphon is rather heavily chitinized and longitudinally 
striated, and bears near its apex four groups of three hairs 
each. The opening at the apex is a vertical slit fringed 
with minute hairs. In this slit, and lying between the ends 
of the two big tracheal trunks, is a heavily chitinized spear- 
