The Douglas-fir hylesinus, Pseudohylesinus nebulosus (Leconte), is a common bark beetle in western North America from British Columbia to Mexico. Although Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, is the preferred host, the beetle has been collected also from western red cedar, Thuja plicata Donn, grand fir, Abies grandis (Dougl.) Lindl., amabilis fir, Abies amabilis (Dougl.) Forb., and western hemlock, Tsuga heterophylla (Raf.) Sarg., on the west coast of British Columbia, and from western hemlock and western yellow pine, Pinus ponderosa Laws., in the interior of the Province. Swaine (1918) describes Pseudohylesinus nebulosus (Lec.) as “a slender species, with strong colour-markings in dark and light reddish-brown; the male very densely clothed with stout scales; the epistomal lobe strongly developed; length, 2.8 mm.; width, 1.2 mm. The supposed female has interspace 9 on the declivity less strongly serrate, and the elytral scales decidedly elongate and becoming plumose towards the base.”

This paper includes descriptions of a new species of Cinara and one of Micromyzus.

The species of Cinara belongs to the species group in which the base of the cornicle hears both heavy and fine setae. In other members of this group the heavy and fine setae are evenly distributed over the surface of the base of the cornicle, but in the species described here the fine setae are clustered around the orifice and the heavy ones are closer to the margin of the base than in related species (Fig. 4). Another difference is that the dorsum of the abdomen is heavily sclerotized rather than having the small, isolated sclerites characteristic of the other members of this species group.

The genus Diastictis Hübner (1818: 21) has as monotype D. argyralis Hübner. Warren (1892: 434), neglecting the original publication, proposed Anomostictis as a substitute name for Diastictis Hübner, 1825, which is preoccupied by the geometrid genus Diastictis Hübner, 1823. Warren's selection of argyralis as type of Diastictis Hübner, 1825, is an effective type designation for Anomostictis, which therefore is a junior objective synonym of Diastictis Hübner, 1818.

Many fields near the shore of St. Mary's Bay, Digby County, N.S., are severely infested with the wireworm Agriotes sputator (L.). This European species, established in Canada only in scartered areas in Nova Scotia, is a very prolific and destructive insect. Infested fields frequently contain one and a half million larvae per acre and as many as 55 larvae have been found in a six-inch cube of soil. In such areas the vegetation on many acres of potentially excellent grassland has deteriorated to little but hawkweeds, Hieracium spp., plants apparently not attractive to the larvae.

In this paper 12 new species of scolytid beetles of the tribe Micracini are described from the United States, Mexico and Honduras. Notes concerning the geographical distributions and the biologies of a few other Mexican species are also included. Unless stated otherwise, the specimens taken in Mexico were collected by the author while with the 1953 expedition of the Francis Huntington Snow Entomological Museum (University of Kansas, Lawrence). The new species represent the following genera: Micracisella (3), Thysanoes (2), Pseudothysanoes (3), Crytocleptes (3), and Stenoclyptus (1).