During a study on the litter arthropods of the natural forests of southern Quebec, Mymarommatidae specimens were found near Lachute, northwest of Montreal. Fewer than 200 specimens of Mymarommatidae have been collected throughout the world (Huber 1987); there are only nine species, all in the genus Palaeomymar Meunier (Yoshimoto 1984). Morphologically, the insects are characterized by a two-segmented abdominal petiole and atrophied posterior wings attached to the anal margin of entirely reticulated anterior wings (Huber 1987). Their biology is still unknown (J.T. Huber, pers. comm.), although it is thought that they may be insect egg parasites (Yoshimoto 1984). Yoshimoto (1984) included the Mymarommatidae in the Chalcidoidea. However, Gibson (1986) proposed not to include them in a superfamily until the phyletic relationships of the Terebrantes are better defined.

Predators of the spruce budworm, Choristoneura fumijerana (Clem.), include both invertebrates and vertebrates (Jennings and Crawford 1985). Birds are the best known and most extensively studied vertebrate predators, but because of their arboreal and omnivorous feeding habits, the deer mouse, Peromyscus maniculatus (Bangs), and the red squirrel, Tamiasciurus hudsonicus (Bangs), often are implicated as potential predators of budworm larvae and pupae (Morris et al. 1958; Morris 1963; Otvos 1981; Welsh 1983). In laboratory feeding trials, W.F. Chesire estimated that red squirrels had a mean food capacity of 600–700 mature larvae or pupae of the spruce budworm per day (Morris 1963). R.T. Mitchell examined the stomach contents of 25 red squirrels collected during a major spruce budworm outbreak in northern Maine (Dowden et al. 1953); he found that spruce budworms made up 51% of their total food. On the basis of these results, Dowden et al. (1953) estimated that a red squirrel could eat 400–500 larvae per day.