Female.—Length 7 mm. Head very little wider than thorax, cheeks, viewed from the side, broader than the temples; face much broader than long, shallowly sparsely punctate; eyes large, prominent; malar space about as long as basal width of mandible; clypeus convex, much less than twice as broad as long, the anterior margin truncate; distance from clypeal foveae to eyes about equal to length of clypeus; lateral ocelli not distinctly larger than median ocellus; longest segment of maxillary palpus distinctly shorter than second segment of antennal flagellum; apical segment of labial palpus much longer than preceding segment; antennae of the type broken, seven segments of flagellum present; first flagellar segment about as long as height of eyes.

Incidental to the collecting of ticks and other animal parasites in the Bitterroot Valley of Southwestern Montana, a number of nests of magpies. Pica pica hudsonicus, and a nest of the common crow, Corvus brachyrhynchos, were examined particularly for blood sucking dipterous larvae, Protocalliphora spp.

Specimens of a chalcidoid parasite reared by Wm. L., Jellison and Cornelius B. Philip, of the Rocky Mountain Spotted Fever Laboratory of the United States Public Health Service at Hamilton, Montana, from pupae of Protociilliphora avium Shannon and Dobroscky infesting bird nests appear to represent a genus and species new to science and are described below.

Breeding at Go Home Bay confirmed what had already been suspected from our collections and breedings in the Ottawa and Knowlton regions, viz , that the nymph and female imago referred to by Clemens under the name flavescens belong to the species, ruber McD. Nymphs were secured at the Flat Rock Falls, the identical locality where they had been collected by Clemens, and two males, three females bred through to the adult stage (June 19, 21, July 2). The abdominal tergites of the nymph are not always as immaculately brown as indicated by Clemens ; there are frequently traces of pale dashes laterally and subdorsally along the anterior margins of the segments, serving to a certain extent to define the usual median and submedian dark bands and submedian dots.

Male.—Length 12.4 mm. Body feebly convex. Dorsal surface of head, pronotum, and elytra green, not bronzed. Antennae, labrum, mandibles, palpi, scutellum, legs, and entire ventral surface including the elytral epipleura, black; vestiture bright reddish-brown.