AMERICAN MUSEUM NOVITATES

Nest Architecture, Immature Stages, and Ethnoentomology of a New Species of Trigonisca from Northern Colombia (Hymenoptera: Apidae)

A Trilobite Cluster from the Silurian Rochester Shale of New York: Predation Patterns and Possible Defensive Behavior

Intraspecific Variation through Ontogeny in Late Cretaceous Ammonites

Immature Stages of Selected Meliponine Bees (Apoidea: Apidae)

The Guardstone Spiders of the Phrurotimpus palustris Group (Araneae, Phrurolithidae)

Phylogenetic Analysis and Revision of the Trilobite Subfamily Balnibarbiinae (Olenidae)

Egg and Mature Larva of a Species of Plebeia with a Preliminary Overview of the Mature Larvae of the Meliponini Relative to Those of Other Corbiculate Taxa (Apoidea: Apidae)

Myrmecicultoridae, a New Family of Myrmecophilic Spiders from the Chihuahuan Desert (Araneae: Entelegynae)

A Neotype for Didelphis marsupialis Linnaeus, 1758

Implications of the Tympanal Hearing Organ and Ultrastructure of Chaetotaxy for the Higher Classification of Embioptera

Psittacosaurus amitabha, a New Species of Ceratopsian Dinosaur from the Ondai Sayr Locality, Central Mongolia

The Phylogenetic Relationships of Cretaceous Biting Midges, with a Key to All Known Genera (Diptera: Ceratopogonidae)

Description of a New Species of Ponyfish (Teleostei: Leiognathidae: Equulitini: Photolateralis) from the Gulf of Oman

Unique Metasomal Musculature in Sweat Bees (Hymenoptera: Apoidea: Halictidae) Revealed by Micro-CT Scanning

Lower Jaw of Spathites (Ammonoidea: Acanthoceratoidea) from the Upper Cretaceous (Turonian) of New Mexico

Karyotypes of Six Species of Colubrid Snakes from the Western Hemisphere, and the 140-Million-Year-Old Ancestral Karyotype of Serpentes

First Species of Inbiomyia from the Atlantic Forest of Brazil (Diptera: Inbiomyiidae)

New Species of Cerambycinae and Lamiinae (Cerambycidae, Coleoptera) from Mexico

Karyotypes of the North American Parthenogenetic Whiptail Lizard Aspidoscelis velox, and Return of Aspidoscelis innotatus to the Synonymy of A. velox (Reptilia: Squamata: Teiidae)

Larval Anatomy of the Bee Tetragonula sapiens (Cockerell) (Meliponini); Further on the Larva of Melipona fallax Camargo and Pedro, with a Preliminary Characterization of Mature Larval Meliponini; and Analysis of Multipronged Spicules (Apoidea: Apidae)

An Unexpected New Poropanchax (Cyprinodontiformes, Procatopodidae) from the Kongo Central Province, Democratic Republic of Congo