1925] Mystery of “Trilobite Larvce” Definitely Solved 149 
to Fowler (The Coleoptera of the British Islands, p. 126) “the 
synthetic genus Homalisus ought perhaps to be removed from 
the family (Lycidae) and regarded as is done by some authors as 
a separate family in itself.” 
In his splendid work, “Fauna germanica” Reitter keeps the 
position of the genus Homalisus in the Lycidae and adds with 
reference to H. frontes bellaquei Geoffr: “Das sehr seltene $ hat 
nur ganz kurze klaffende Flugeldecken und die Tergiten liegen 
frei.” 
I have not been able to find any more recent references to 
the germs Homalisus. But in all other respects the female is a 
normally developed beetle. 
Fig. 2. Diagram illustrating the types of metamorphosis in the Lycidae. 
As a very striking example of retrograde development 
among the Lycid females we must now add the females of the 
Bornean “trilobite-larvae”. All the three vermiform females I 
have been successful in breeding ( Duliticola paradoxa and the 
females marked as No. 1 and No. 6 (Plate HI) show no dif- 
ferences whatsoever from the larvae except in color and in 
