66 4 
The subfamily Inquilinz as its title indicates contains species which are 
inquilines or guests in the galls of the preceding species, which in structure and 
appearance they closely resemble. 
The truly parasitic species of the Cynipide are comparatively few in 
number. 
Evaniip&.—The species belonging to this family are easily distinguished, as 
the abdomen is attached to the dise or base of the metathorax, instead of to the 
apex as in the other families. The species found in Canada belong chiefly to the 
genus Aulacus, the members of which frequent decaying trees, in which they may 
be found ovipositing. We have also two species of Fcenus—insects with a curious 
sickle-shaped abdomen—of which one (F. incertus) has a short ovipositor, while 
the other (F. tarsatorius) has a very long one. They may frequently be seen 
flying about trees, telegraph poles, etc., examining and entering insect burrows 
and crevices, and also upon golden-rod and other flowers in autumn. They are 
said to be parasitic upon certain bees. The species of Evania, which have curious 
hatched-shaped abdomens, are said to infest cockroaches. 
TRIGONALID&.—This family contains only one genus (Trigonalys) and the 
four species therein are of rare occurrence and not as yet recorded from Canada. 
Habits unknown to me. 
IcHNEUMONID&.—This family is a very extensive one and contains our largest 
‘and best known parasites. It is divided into five sub-families of somewhat equal 
size. Of the sub-family Ichneumonine there are more than two hundred species 
credited to the typical genus Ichneumon, and 
of these at least fifty occur in the vicinity of 
Ottawa. These ichneumons are somewhat 
wasp-like in form, but more slender ; our largest 
species (J. grandis) is sometimes an inch in 
length, but some of the smaller species are less 
than one-third of an inch and the average size 
is about two-thirds. The ovipositor is short 
and retracted within the abdomen so as to be 
rarely visible, but the females may be dis- 
tinguished by their stouter abdomens, and 
frequently by the antennz being rolled, while 
those of the males are longer and straight. 
The anterior wings have a small pentagonal cell 
called an areolet, which occurs also in many 
other Hymenoptera, (see wing of Cryptus, 
i Fig. 29) although the areolet is incomplete, 
Fie. 29. triangular, rudimentary or wanting in many 
genera. Many of the ichneumons are entirely black (or with a few white 
markings,) others have the abdomen red, others again are banded with black 
and yellow, or are ferruginous with black markings. They are parasites of the 
caterpillars of our butterflies and moths. The genus Amblyteles contains a num- 
ber of species almost identical in appearance with those of the preceding genus 
and of similar habits. Hoplismenus is distinguished by having pointed tubercles 
or spines upon the metathorax. A common and well marked species is H. 
morulus, which is a parasite of certain butterflies. The genus Trogus contains 
a few large species of which 7’. exesorius, a yellow species with smoky wings, is 
a common parasite of the caterpillars of our Black Swallow-tail butterfly, 
Papilio astervas. 
OCryptinaz.—Cryptus, the typical genus of this sub-family, contains species 
