THE ALYDINiE OF THE UNITED STATES. By vS. B. Frackkk, Madison, Wisconsin. The family Coreidae consists of five subfamilies, two of which, the Merocorinae and Pseudophloeina?, are very small. The larger divisions, often ranked as families themselves, are: Corizinae, characterized by a mesal constriction of the fourth dorsal abdominal segment and the obsolescence of the scent-gland orifices; Alydins, distinguished by the wide head and unusually small bucculse; and Coreinse, which, together with the smaller groups named above, includes the rather diverse remaining members of the family. The Alydinas form a compact and easily recognizable group found in all parts of the world and include several cosmopolitan genera. Those occurring in the United States all possess a head at least three-fourths as wide as the pronotum and all except the last two genera have well developed and conspicuous scent gland orifices in front of the posterior coxee. The bucculas are short, not surpassing the insertion of the antenna? and the scutellum is narrower than the intraocular part of the head. In this paper eleven genera, nineteen species and seven varieties are recognized, of which one species and three varieties are new. Material was available in all except three subtropical species (numbers 3, 4 and 8) each of which has been reported from the United States only once. The discussions of these three are based on the descriptions. Eight of the species found in the United States, and six of the genera, are subtropical, and are confined to the southern tier of States. Four are probably limited to the Rocky Moun-tains and Pacific coast, and three almost entirely to the States north of the Ohio River. The remaining four have been col-lected in nearly every part of the United States. P rote nor belfragei, Megalotomus 5-spinosus, Alydiis eurinus, and A. conspersus are among the most common Heteroptera of the temperate zone. No members of the subfamily are known to be of economic importance. The common species are found in meadows or 255
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