Haemoproteus fallisi n. sp. is described from the American robin. Turdus migratorius L. Other hosts and geographical range are cited and a summary of haemoproteid infections in the Turdidae is included. H. fallisi is compared with other haemoproteids described from the Turdidae, H. moruony de Mello and Braz de Sa is synonomized with H. fringillae and H. orizivora. H. geocichla Cleland and Johnson is considered to be a nomen nudum. Haemoproteus danilewskyi, also recorded from the Turdidae, is distinguished from H. fallisi by its larger size and by the fact that it surrounds the host cell nucleus and occupies nearly all of the host cell cytoplasm.

The response of Simulium euryadminiculum Davies towards silhouettes of different shapes and colors was observed, using an ether extract of the uropygial gland of the common loon to concentrate the flies in the experimental locality and "Tanglefoot" to trap the flies on the silhouettes. These simuliids were attracted primarily to the head–neck portion of duck decoys, most flies landing on the leeward side. The simuliids were attracted to the terminal (and most prominent) portions of artificial head–neck or cylindrical silhouettes; the distribution was not markedly influenced by the color of the silhouette. The number of flies attracted to three-dimensional targets was markedly influenced by color, black being the most attractive and white relatively unattractive. This selection of black by the fly may reflect its adaptation to the color of its natural host, the loon. Response of the flies to a two-dimensional (plane surface) target was essentially similar except that white was the most attractive color and black was relatively unattractive. Possibly this selection of white is associated with a resting response.

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The variability of nine morphometric parameters of Leucocytozoon simondi, L. dubreuili, and L. fringillinarum was studied with respect to variability (a) within a single bird; (b) within a single bird at different times; (c) between different birds of the same species: (d) between the same species of birds of different populations; and (e) between different species of birds. The results indicated that the variability of the parasites was of the same order of magnitude for all situations studied. Leucocytozoon dubreuili, L. fringillinarum, and the round phase of L. simondi could not be separated on the basis of measurements alone. It was concluded that the morphometric characteristics were not valid criteria for species differentiation. These studies result in the proposed synonymy of Leucocytozoon anseris with L. simondi, and of L. anellobiae, L. bouffardi, L. cambournaci, L. gentili, L. monardi, L. roubaudi, and L. seabrae with L. fringillinarum.