. Economic entomology . Genus Phthirius {Leach). The genus Phthirius is a very distinct and peculiar one, the essential character of which is that the grasping or scansorial claws are on the hind feet instead of on the fore feet as in the Pediculus. CASE Phthirius inguinalis (crab louse).—1. Specimens; 2. Enlarged figiu-e oC XX. ^ Nos. r, 2. ditto.

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