294 
Philippine Journal of Science 
1919 
mesothoracic segment of the larva, leaving a black scar near 
its articulation with the prothorax. As many as eighteen 
punctures made by the ovipositor of the parasite were counted 
in the upper epidermis of a leaf over the fifth chamber of the 
larva. The larvae of the parasite emerge from the pupa of 
the beetle and pupate around it, after the maner of many spe- 
cies of the Chalcididae. The adults emerge through numerous 
circular punctures which they chew in the leaf epidermis. As 
many as twelve exuviae of the parasite’s pupae have been counted 
around one beetle pupa carcass, and twelve adults were bred 
from one mine. 
Adults of the parasite are tiny, metallic, purplish blue-green 
insects, with brownish black eyes and snow-white, black-tipped 
tarsi. The body is regularly ornamented with snow-white 
hairs, which are also found on the antennae and legs. The 
length is about 1.25 millimeters. 
It is believed that the larvae are also attacked by a fungus 
disease, the disintegrated remains of several larvae giving 
evidence of some such attack. Numerous mites of an unde- 
termined species inhabit the leaf chamber, feeding on the debris 
left by the beetle larvae. 
INJURY BY THE BEETLE AND REMEDY FOR ITS ATTACK 
It is rare to find more than three larvae in a single leaf, but 
each larva can do much toward injuring the leaves and thus 
spoiling the general appearance of the fern. The most ex- 
peditious method of combating the pest is to examine each 
leaf for the incipient mine and its occupant and, when located, 
simply to kill the larva by squeezing the spot between thumb 
and finger. 
The seasonal prevalence of the beetle is not known ; but, from 
the appearance of a large number of ferns examined at the 
college, it is believed they do most of their damage in the period 
from December to March. One of my students states that the 
insect was abundant in July and August of 1917. 
In examining bird’s-nest ferns for further specimens of the 
blotch mine buprestid, Endelus bakeri, my attention was at- 
tracted to a short-leaved plant, perhaps another variety of 
Asplenium niclus, in which the mines were linear and very tor- 
tuous, as shown in Plate I, fig. 4. Specimens of these leaves, 
containing nearly full-grown larvae, were kept in cages, and to 
my great delight two adults emerged which are entirely dif- 
ferent from E. bakeri. The specimens, both of which are fe- 
