120 1'^"'°'' 
Salix fragilis, L. 
cinerea, L. 
aurita, L. 
caprea, L. 
repens, L. 
herbacea, L. 
Pinus sylvestris, L. 
* Abies communis, L. 
? Juniperus communis, L. 
Taxus baccata. 
! Juncus, spec. 
? Triticum repens, L. 
Pteris aquilina, L. 
In conclusion, we may add that we shall be greatly obliged to an^ 
observer who will kindly furnish us with notes respecting galls on any 
of the plants marked " ! " or " ? " (also on plants not mentioned at all 
in our list), either in the pages of the Magazine, or, still better, by 
letter to either of us, so that the information may be incorporated in 
our proposed Catalogue in its proper place ; and if such communicatioB 
can be accompanied by specimens of the gall or insect, or both, we shal 
feel doubly obliged. 
August, 1868. 
Observations on the habits and tranformations of Hylesimis crenatus, H.fraxini anc 
H. vittatv.s. — As the above mentioned species occur plentifully in tliis district, I 
have been induced from time to time to make notes of their habits in their earliei 
stages ; which notes, without any claim beyond original observation, may possibly 
interest others, as they have interested me. I am quite aware that the ceconomy 
of these insects has been elaborated by both Continental aud English authors. 
Most Entomologists are, of course, well acquainted with the fact that thfl 
perfect insect of the species of Hylesinus forms a burrow or gallery in the cambium 
layer of the bark of recently fallen trees, along the sides of which the eggs are 
deposited ; the larvae feeding in the inner bark during the ensuing months, whilsl 
it still retains a modified vitality, and completing their metamorphosis in time to 
renew the same cycle the ensuing year. They form their burrows transversely tv 
the fibres of the tree, but the species of most of the other genera of the family 
form them parallel with the fibre. The larvae, starting at right angles to the parent 
burrow, form theirs in the reverse direction, or nearly so ; their increase in size 
making them diverge from each other and producing rather a fan-shaped markintr. 
The two species to which I have directed most attention, Hylesinus creinins 
and H. fraxini, arc attached to the ash (Fraxinus excelsior). The other spdii-j, 
Hylesinus vittatus, is attached to the elm, and is fairly abundant in this district. It 
is difficult, however, to say of any species of the Xylophaga whether it be abundant 
or not ; as, however, difficult it may be to find it, when found, it is almost certain 
to be in some numbers. Thus, though H. crenatus is a somewhat scarce species, I 
could have taken it last winter in almost unlimited numbers. H. fraxini is, never- 
theless, an undoubtedly abundant species. At this season (May 22) it may bw 
found on any recently felled ash timber, busily engaged in oviposition, appearing 
very decidedly to prefer recently fallen timber to the growing tree, and even 
attacking wood that has been cut many months. Early in May the perfect beetles 
