AND HABITS OF RHIZOPHAGUS DEPRESSUS, FOWLER. 131 
(Pinus Austriaca) infested witha Bostrichus,1 found Rh. depressus 
larve, which, on being placed on the outside of the Pine and 
watched, entered by the holes the Bostrichus had made, and 
hid there. : 
In October 1898, on a Scots Pine attacked by a Bostrechus, 1 
got in the mother galleries of the latter, Rhzzophagus larvee. 
On April 15, 1898, there came into my possession a section, 
measuring a yard, of a well-grown Scots Pine. This was 
found on examination to contain below the bark hundreds of 
fylesinus palliatus \larve. To prevent the beetles, when these 
had attained maturity, from escaping into the open, the section 
of stem was placed in a sack made of strong cotton. On July 
rath I found on the floor of the sack about one hundred larve, 
which, observed through their later stages, proved to be larvee 
of Rk. depressus. These larvee, on being touched, coiled them- 
selves up; on being laid on a piece of paper or glass or 
board they crawled actively away in all directions. As the 
number was far in excess of what might have accidentally 
tumbled out of the bark, the natural conclusion was that they 
had voluntarily left the pine stem in order to undergo pupa- 
tion in the ground. To make certain of this—I have since 
found in the literature that Perris’ had previously recorded 
that the Rhizephagus larve became pupz in the soil a I 
covered a large circular transparent glass plate with an inch 
and a half of soil, and dropped here and there over the surface 
of the soil fifty larve. In one minute all without exception 
had disappeared into the soil. Into a glass tumbler half-filled 
with pressed-down soil I also dropped twenty larve, and these, 
too, rapidly buried themselves. 
Towards the end of July I found that a larva had pupated ; 
the pupa was lying a little below the surface of the soil against 
the glass of the tumbler. On some of the soil being emptied 
from the tumbler, more pupze were found, and also larve as yet 
unchanged. With the glass plate I also had success, as on 
holding it overhead and looking through the under surface 
the tracks of the larvae, as these had moved along the plate 
after burying themselves, were plainly seen, and a number of 
pupz were found lying on the plate at the bottom of the Soil. 
As August went on these pupze were noticed to be ‘‘browning, 
