The catalog provides information on the type of material of 75 valid species of the genus Aphytis Howard (Hymenoptera: Aphelinidae) in the collection of the Entomology Research Museum, University of California, Riverside. 7,390 specimens were remounted from Hoyer's medium into Canada balsam, including 309 primary types, 2,473 secondary types, and 4,608 non-type specimens. Lectotypes are designated for 11 species.

The purpose of this volume is to encourage and facilitate focused research and provide a forum for scholarly exchange about the status of Mayfly and Stonefly science. Professor John Brittain, whose research is focused on freshwater entomology, especially egg development and life cycle strategies of Ephemeroptera and Plecoptera, presents a chapter reflecting on the quality of mayflies as good indicators of global warming and the quality of streams and lakes. Professor Emeritus Andrew Sheldon, whose interests have encompassed community and population ecology of aquatic animals over a span of more than 40 years, especially insects and fishes, explores topics of Scale and Hierarchy and the Ecology of Plecoptera, discussing how studies emphasizing scale and perspective reveal importance of stoneflies to ecosystems. Other topics cover a broad base of disciplines including morphology, physiology, phylogeny, taxonomy, ecology and conservation. The chapters have been compiled into three sections for this volume: Ecology, Zoogeography and Systematics.

The Neotropical ant genus Linepithema is revised at the species level for the first time. Following extensive synonymy, nineteen species are recognized, including six new species. Taxonomic keys, diagnoses, illustrations, and discussions of the biology, distribution, natural history, and taxonomy are provided.

Heliodinids are tiny, brightly colored dayflying moths. Phylogenetic relationships among genera of Heliodinidae are proposed using parsimony and character compatibility. We describe and illustrate 45 North and Central species (25 newly named) assigned to five genera (two new, two exhumed from synonymy). Larval host plants are recorded for 33 species (14 newly discovered), about 45% of the known fauna; 90% of these are specialists on Caryophyllales, primarliy Nyctaginaceae.

The authors revise the genus Anopina of the leafroller family, Tortricidae (Lepidoptera). This genus ranges from southern Canada to Costa Rica, with its greatest species richness in the higher elevations of Mexico. The larvae are suspected to be leaf-litter feeders. Sixty-two species are treated, of which forty-nine are described as new to science. The authors provide a hypothesis of phylogenetic relationships of the species, propose a classification, supply a key to species groups based primarily on features of the genitalia, and include illustrations of adults, larvae, and male and female genitalia.

The coenosus group, containing 34 species, is the most speciose clade of Histerini in the Americas. The author provides the first comprehensive revision of these species, including keys for identification, complete distributional data, illustrations of diagnostic characters, and a detailed phylogenetic analysis. He uses the phylogeny to examine the evolution of several biological characteristics, with particular emphasis on myrmecophily.