I^Q LNovemb* 
imago states. In March last I cut off from this tree all parts then harbouring tl 
latter insect, — leaving, however, plenty of vrood unattacked, and in this I hai 
since been observing Sinodendron depositing its eggs. On May 23rd I found tin 
burrows, easily detected by the heaps of frass outside, each containing a pair of tl 
beetle, — which, as I left none in or about the tree, were, of course, bred elsewher 
The burrows entered the exposed rotten wood for a short distance at right angli 
with the surface, and then turned upwards along the fibres of the wood ; thf 
were three or four inches long, and wider in places, as if for " shunting." In thei 
and other burrows found afterwards, before any eggs were laid, the female beet 
was always at the side of the burrow with her head at its extremity, as if coi 
tinuing the excavation, and the male always had his head directed towards tl 
opening and often close to it, — the remarkably flat front of his thorax nicely fittir 
the burrow, and with sawdust sticking to it, as if it were used for pushing out fraa 
It is not unlikely that the supposed shunting-places may have been eaten out I 
the male for nourishment. On the same day I found a solitary $ , who had on 
burrowed her own length into the wood. I replaced her in an artificial burro 
made with the knife (after examining burrows, I usually replaced the beetles in th 
way, but doubt not that my proceedings disturbed them very much). The ne: 
day there was a S also in this burrow, and on the 25th I found this pair in cop. ; 
the top of a burrow about three inches deep. On the 24th there was a burro 
containing a solitary ^ , just as that of the 23rd contained a solitary $ , and, 1: 
the next day, this burrow contained a pair of beetles, the ? , as usual, furthest i; 
In opening the burrow I destroyed the S of this pair, but on the 28th, two daj 
after, there was another male in the burrow. On the 31st there was a ? only i 
this burrow, which I accidentally killed : no eggs had been laid. 
On two other occasions I found burrows commenced by males only ; but m 
proceedings so disturbed them that they were gone the next day. I believe tl 
normal length of burrow to be four to six inches, but my opening them so ofte 
made some of them burrow twelve or eighteen inches. On June 11th I opene 
the burrow commenced May 23rd by the solitary ? , and found the extremity < 
the burrow for about three-quarters of an inch tightly packed with frass or sawdus 
in which were four eggs. The S beetle had backed close up against the extremit; 
and the ? was busily excavating a new branch of the burrow, which left tl 
other just in front of the ^ . On June 23rd I opened another burrow, in which 
found only a $ , excavating a branch. In another was about three-quarters of a 
inch of tightly packed frass containing nine eggs ; in a third, a smaller quantity ( 
frass with one egg. Probably in both of these cases the ? was bringing sawduf 
from the new branch of the burrow to put into the one in which oviposition ws 
going on. It appears that the galleries are always excavated by two beetles, an 
that they meet first after the burrow is commenced ; but what seems somewhs 
remarkable to me is, that the burrow is commenced indifferently by either the < 
or ? beetle. The <J usually, I suspect, when undisturbed, remains until ov 
position is well advanced. 
In a rotten ash-log, just attacked by Sinodendron, I have subsequently foun 
several burrows which enable me to supplement my observations. One of thes 
burrows was a very fine one, about six inches long, besides branches packed wit 
eggs, of which I was able to examine two carefully. These branches were eac 
