Notes on North American Mosses. II

Notes on North American Myriapoda of the Family Geophilid ^ , with Descriptions of Three Genera

When, in 1814, Leach erected the family Geophilidce, he proposed but the one genus, Oeophilus. From that time until 18G6 thirteen genera were described, four by Newport, one by Gray, and eight by C. Koch. The characters employed by these writers were external and extremely variable, and the genera established upon them did not, 'for the most part, represent natural groups. The character of the ...

Notes on Sandflies. Part II

Lecture Notes on Acoustics II

Cumulative spectral decay of a loudspeaker showing the transient behavior.

Notes on Galois Theory II

Lemma 2.1. Let F be a field, let E = F (α) be a simple extension of F , where α is algebraic over F and f = irr(α, F, x), let ψ : F → K be a homomorphism from F to a field K, and let L be an extension of K. If β ∈ L is a root of ψ(f), then there is a unique extension of ψ to a homomorphism φ : E → L such that φ(α) = β. Hence there is a bijection from the set of homomorphisms φ : E → L such that...

New Synonymy , New Species , and Taxonomic Notes of North American Pityophthorus ( Coleoptera : Scolytidae ) , Part Iii

— New synonymies and new data affecting North American Pityophthortis are proposed as follows: chalcoensis Hopkins { = herrerai Hopkins) and nigricans Blandford ( = chiapensis Bright). Neotypes are designated for the following species described by Eichhoff: concentralis, cribripennis, infans, puchellus, and tuberculatus. New species are: carinatus (Canada), cavatus (Manitoba, Saskatchewan), eut...