1925 ] Mystery of u Trilobite Larvce” Definitely Solved 131 
has devoted his time and efforts to the exploration of the insect - 
fauna of the Philippines, informs me that Kleine recently has 
doubled the number of Philippine Lycids. 
Unfortunately I was not able to study the development of 
the eggs which may prove to be of extraordinary interest. When 
the male and the female are so extremely different not only in 
size but in their whole organization, it is highly probable that 
the male-larva is very different from that of the female, i. e., the 
“trilobite-larva” we find crawling on the ground. Are the male 
larvae already 11 ah ovo” different to the female-larvae and of what 
shape and form are they? And how large a percentage of a 
female’s 300-400 eggs turn into males, how many into females? 
Where and how do the male-larvae live and where the males, 
both being obviously extremely hard to find? 
All these interesting questions remain to be settled! 
Methods Of Securing Males Of The “Trilobite-Larwe.” 
It is certainly strange that the “trilobite-larvae” have for so 
long frustrated the efforts of the entomologists to solve their 
mystery. I am quite sure that if I had not been so persistent in 
my searches and during so long a time devoted special attention 
to the problem in the field. I also should have failed. 
My experience clearly shows that the males of the “trilobite- 
larvae” can be got only by bringing together a large number of 
the larvae and keeping them under conditions as natural as 
possible until they turn into egg-laying forms. These have to 
be exposed at suitable places where the larvae are abundant and 
during the wet season, when the males seem to have developed 
into winged beetles. Change in temperature and altitude should 
be avoided so much as possible. Finally the hunter should arm 
himself with great patience! 
Such exposure at the right place remains to be done with 
five more Bornean forms and with the various larvae found in 
Java, Sumatra, Malay Peninsula, Cambodja, Indo-China and 
the Philippines, from which latter faunistic region Professor C. F. 
Baker with usual generosity and kindness has sent me a couple 
of species from the Island of Mindanao. 
