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P. canadensis, Norton. 2 females. June 7th. 
P. excavatus, Norton. 1 male. 
P. quebecensis, Prov. 2 females. June 27th, 30th. 
P. pallimaaihts, Norton. 4 females. June 6th, 7th. 
P. ocreatus, Say. 1 female. 
P. rnfofasciatns, Norton. 3 females. June 26th, July 26th. 
P. ductus, Harr. 1 female. June 28th. (Type.) 
P. Harringtonii, Prov. 1 female. (Type.) 
P. luteicornis, Norton. 1 male, 2 females. June 2nd, 12th. 
Macroxyela. 
M. infuscata, Norton. 1 female. 
This specimen was taken near the city two years ago by my son 
then about nine years of age, and is the only one I have seen. 
Xyela. 
X. minor, Norton. 1 male, 10 females. June 8th, 16th. Spruce. 
Subsection Xylophaga. 
This limited division contains the few species which feed internally 
upon the pith, or woody tissues of the plants infested. The ovipositor 
of the female, instead of being saw-like, is more prolonged, and is so con- 
ducted that it forms a regular borer, which in the larger species can 
pierce even the solid wood of our forest trees, in which the eggs are de- 
posited and in which the larvae live. These larvae are somewhat 
elongated white grubs, having only rudimentary legs and thus approach- 
ing more closely the ordinary footless grub of the Hymenoptera, than 
do saw-fly larvae. The species of Xylophaga are all included in one 
family, the Uroceridae, and only five genera are represented in Canada. 
The larvae of Cephus infest the stems of grasses or the twigs and shoots 
of various shrubs; those of Oryssus and Xiphydria bore into the trunks 
of maple, willow, poplar, etc., those of Tremex inhabit chiefly old maples 
and beeches, while those of Urocerus confine their attacks to the conifers 
which they sometimes seriously injure. 
