1925 ] Mystery of “ Trilobite Larvce ” Definitely Solved 
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female shows certain distinctive features in comparison with 
the larva. 
The latest author to deal with the “trilobite-larvse” is 
Gravely in his paper “The Larvae and Pupae of some Beetles 
from Cochin” (Records of the Indian Museum, Vol. XI, part 
V, No. 20, 1925). He describes and figures the larva of Lyro- 
pceus biguttatus, which in general type resembles the “trilobite- 
larvse” although it is considerably smaller in size. The larva 
developed normally into a pupa and imago. Gravely states that 
“the larvae which give rise to these winged insects are, however, 
not particularly large and throw no certain light on the status 
of the much larger insects with which the name “trilobite- 
larvae is more particularily associated.” 
Gravely also refers to two large insects of the “trilobite-type” 
which were found in the Cochin forests. They are figured on 
plate XX and measure about 28 mim. He also mentions another 
larva of much smaller size also from Cochin, which has more 
elaborate tubercles and papillae and differently constructed 
mouthparts. He suggests that these former larvae may prove to 
be immature females of the Lycid genus Lyropceus, but leaves 
the question open as nobody has been able to trace their life- 
history. 
III. New Investigations. 
On arriving in Borneo in May 1922 I made up my mind to 
have the problem of the “trilobite-larvae” of Borneo definitely 
solved more especially as my interest for these peculiar forms of 
life had been already aroused during my sojourn in Sumatra in 
1919-21, when I came across a single representative of “Perty’s 
larva” in the jungles of Siantar. 
It has long been known that these peculiar larvae reach 
their maximum of size in Borneo. So far as I have been able to 
ascertain at present two distinct types have been recorded from 
there and superficially described. To this I am glad to add four 
more, making a total of six species. One of them is a very 
striking form, measuring nearly 70 cm., quite black with a serie 
of sealing-wax red tubercules on the dorsal side. It is figure 
