1925] Mystery of “Trilobite Larvce” Definitely Solved 
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parallel-bodied kind which I had also been successful in breeding, 
were exposed at selected places but all in vain. As other duties 
called me to Kuching I had to return leaving my collectors 
behind with instructions to report immediately if any males 
should appear in the cages. 
During more than two months this tedious work was kept 
going without the slightest results. In the meantime I visited 
the place twice making some slight alterations. The native 
collectors lost all hope, complained about the cold weather and 
wanted a change. 
I gave, however, orders to move the experimental base 
1000 feet higher up, where big larvae seemed to be more plentiful, 
as the attempt to get the males had to be continued. A reward 
of $10.00 for the first male stimulated the collectors very much 
in their efforts. 
I returned again to Kuching but heard nothing from my 
collectors during the following weeks. I visited the place again 
and made several alterations placing the cages in more open 
places, exposed to the weather and wind, here and there clearing 
patches of the dense jungle vegetation. 
This proved ultimately to be successful for one morning a 
male was caught in copula with a female. (Plate IV fig. 1). 
I was just on my way back, when one of my collectors came 
running after me with the copulating pair wrapped up in a 
banana leaf. At the ventral side of the big female a small black 
beetle was seen firmly attached and with his tip of the abdomen 
deeply inserted in the female’s sexual opening. 
It soon detached itself from the female and was preserved 
in alcohol. The female was brought back to Kuching where it 
soon started to deposit a large number of eggs, but unfortunately 
they never hatched out. Probably the male had been too much 
disturbed and the eggs had not been properly fertilized. 
My collectors received strict orders to carry on the ex- 
periments in order to secure as many males as possible and to 
watch carefully the eggs deposited by the females. Four more 
weeks’ work yielded a dozen more males of exactly the same type 
as the first one. It was therefore evident that I had, after all my 
trouble and effort, secured the proper male 
