I do not have enough information about Polydrusus yet. For now, all I know is that it is a widespread genus mainly Palearctic, with about 188 described species from which 24 are recorded from the New World -11 from Mexico and Central America; 3 from South America (Argentina and Chile); 2 from the West Indies; and 8 from North America -.
Until now, I just have seen specimens of few American species:
P. americanus (USA: WV)
P. cervinus (USA: ME)
P. chlorogaster (El Salvador: Cerro Verde)
P. conicus (Mexico: Michoacán)
P. impressifrons (Canada: Ontario)
P. mutabilis (Costa Rica: Heredia)
P. nothofagi (Chile: Aisén)
P. partitus (El Salvador: Montecristo)
P. peninsularis (Mexico: Baja California)
P. roseus (Chile: Cautin)
P. sericeus (USA: MA)
From a general examination I can say that Polydrusus is an extremely variable genus, overall in head characters. In general, all have small size (between 3 and 8 mm) connate claws, phanerognathous mouthparts and slender antenna.
Coming soon, I will make some dissections to find out shared characters between Apodrosus and Polydrusus.
Image from: http://magickcanoe.com/beetles/polydrusus-1-large.jpg
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