In this paper 13 new species and a new genus (Phloeocleptus) of scolytid beetles of the tribe Micracini are described from Mexico and Honduras. 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: Hylocurus (6), Phloeocleptus (2), Micracis (4), and Pseudothysanoes (1).

The aspen blotch miner, Lithocolletis salicifoliella, Cham., has been abundant on trembling aspen, Populus tremuloides Michx., throughout central Canada for the past few years. The mines of this species are found on the underside of the leaves, and are often abundant enough to cause premature browning of the foliage. This insect first came to the attention of the Forest Insect Survey of Ontario in the vicinity of Lake Nipigon in 1944. By 1950, the infestation covered all but the southern part of Ontario, and was reported in most aspen stands in Manitoba and Saskatchewan. The intensity of the infestation in the northern part of Ontario began to decline by 1952, and in 1954 damage was negligible.

No detailed description of the larva of any member of the genus Lithocolletis exists in the literature, although various aspects of the structure of one or more species have been described by Wood (1900), Trägårdh (1913), Fracker (1913), and Peterson (1948), and the relation between structure and habits has been examined by Needham (1928) and Hering (1951). Martin (1956) has discussed the bionomics of L. salicifoliella Cham. The present contribution forms a complementary study of the immature stages of this same species.

Study of lonchaeid material reared from cones of various coniferous trees in North America revealed five previously undescribed species of the genus Earomyia Zett. The composite nature of cone-infesting lonchaeidae has not been understood and at least four of the species treated here have been considered as a single species (Keen, 1938, 1952). Much of the material studied, particularly that reared by various Forest Insect Investigations officers of the United States Bureau of Entomology and Plant Quarantine (bearing Hopkins U.S. numbers), has been misidentified as Earomyia viridana (Mg.) (Keen, op. cit.), Lonchaea albitarsis Zett., L. rufitarsis Macq., L. polita Say, and others.