Abstract
SYNOPSIS. Earlier experiments suggested that the species of Haemoproteus which infects English wood‐pigeons (Columba p. palumbus) and is transmitted by the hippoboscid dipteran fly Ornithomya avicularia, was unable to infect Columba livia domestica, a host of H. columbae. This has now been confirmed by the injection of sporozoites into two pairs of pigeons, one of each species; in both experiments the C. palubus developed parasitemia while the C. livia did not. It has also been shown that this species of Haemoproteus can complete sporogony in a small proportion (2/73) of Pseudolynchla canariensis, the vector of H. columbae.

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