Notes from the Sarawak Museum. 
ON A REMARKABLE DIPTEROUS LARVA. 
During a recent visit to Mt. Penrissen, Sarawak, I found 
11 segments, into the first of 
which the head can be completely retracted, five annuli can 
plainly be distinguished on segments 2, 3, and 4, but are less well 
marked on the others; the 10th consists only of three. The 
middle annulus of the fourth segment bears on the ventral surface 
а fleshy knob (abdominal pseudopod) which is surmounted by a 
small semicircular chitinous comb longitudinally placed; the 
eighthsegment ventrally bears a median tuft of sete, and a fringe 
cf similar setæ marks the posterior border of the 9th segment, this 
also carries on its ventral surface 2 median setigerous papillee. 
The 10th segment, which is set at somewhat of an angle to the 
9th, bears on the dorsal surface at its anterior border a fringe 
of very strong sete directed backwards. Тһе llth and last 
segment terminates in four finger-like processes clothed with 
delicate hairs, the anus opens on its ventral, two stigmata on its 
dorsal surface. The last three segments are markedly larger 
than any of the preceding ones The larva burrows into the 
sand head first, until completely buried, and then proceeds to 
form its pit-fall in the following manner: the more deeply 
buried tail-end acting as a fixed point, the anterior half of 
the body is curved about in all directions, each curving 
motion being followed by a rapid straightening out, which jerks 
the sand away for some little distance ; since the tail is fixed, the 
result of many of these motions is to produce a circular repres- 
sion with sloping sides; at the bottom of this lies the larva, ven- 
tral surface uppermost, the posterior half of the body still buried, 
the anterior half exposed and straightened out. If now an ant 
is introduced into the pit-fall, the exposed part of the larva sud- 
denly curls up in a spiral coil, the prey being generally included 
