1941] 
Sumatran “ Trilobite Larva ” 
25 
viously where the transformation of the common Javan 
species was accurately described. Koningsberger observed 
the molting of the large larvae into larviform adults and 
proved them to be sexually mature females as several of his 
specimens deposited perfectly formed, though infertile, eggs. 
Koningsberger was disappointed not to secure the male 
which was discovered first by Mjoberg. The latter is a 
small lycid beetle, quite similar to the other members of the 
family Lycidae and scarcely one-tenth the length of the huge 
larviform female. The larval form of the male has never 
been discovered; in fact no very small larvae have ever 
been recorded and Mjoberg found only large ones obviously 
greatly in excess of the size which the male would attain 
before transformation into such a small adult. On this 
account he supposed that the larvae must be sexually di- 
morphic, but this supposition does not necessarily follow 
although it must be admitted that the female forms are 
extraordinarily aberrant while the adult male is a perfectly 
normal beetle. 
The species here illustrated is from the highlands of south- 
ern Sumatra, near the town of Pagaralam, in the edge of a 
jungle close to a waterfall a few kilometers out of the town 
at an altitude of about 3—400 feet. My wife and I had stopped 
to collect near the waterfall and she discovered two speci- 
mens beneath some loose rotted wood lying in an open area. 
We immediately instituted a search for further examples in 
the neighborhood, but without success. 
A comparison of the two larvae reveals that they are very 
different from any of the Bornean forms described and il- 
lustrated by Mjoberg. They resemble closely, however, one 
collected somewhere in the Malay peninsula illustrated by 
him. This specimen is in the Kuala Lumpur Museum, 
but no locality is mentioned and presumably its exact 
provenience is not known. 
When I first examined the two Sumatran specimens, it 
seemed that they must be identical with the Javan one as 
they agree well with Westwood’s figures and the description 
given by Perty. Furthermore, a cursory examination of 
specimens from Java which I saw later in the Buitenzorg 
Museum revealed no obvious differences and Mjoberg refers 
a specimen collected near Pematangsiantar, Sumatra to the 
