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Updated: May 5, 2025
In certain species in the genus Gomphus the males are equally in excess, whilst in two other species, the females are twice or thrice as numerous as the males. In some European species of Psocus thousands of females may be collected without a single male, whilst with other species of the same genus both sexes are common.
Prussia, numerical proportion of male and female births in. Psocus, proportions of the sexes in. Ptarmigan, monogamous; summer and winter plumage of the; nuptial assemblages of; triple moult of the; protective coloration of. Puff-birds, colours and nidification of the. Pugnacity of fine-plumaged male birds. Pumas, stripes of young. Puppies learning from cats to clean their faces.
It has been remarked that the Trichoptera and other aquatic Neuroptera are less local than the land species, owing to the more equable temperature of the habitation of their larvæ, and on account of their being often conveyed along the whole length of rivers. The species of Psocus in the list are far more numerous than those yet observed in any other country, with the exception of Europe.
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