Adult fungus beetles are 1-2 mm long; the body has a smooth surface, but is sometimes covered with fine setae. Antennae are ii-segmented and usually have a three-segmented club; some species have a two- or four-segmented club. Tarsi are five-segmented, but four-segmented in males of some species. These beetles feed on microscopic fungi, mold, and decaying vegetation. Indoors they can be numerous when conditions favor the growth of mold on walls or exposed wood. They transmit mold spores from one location to another. Several species of Cryptophagus occur in bird and wasp nests. Although only small numbers of beetles are found in animal and insect nests close to buildings, these habitats form a network of reservoir populations for some of the most common pest species.

Angularfungus beetle, Cryptophagus acutangulus Adults are 1.9-3.0 mm long and dark brown. Setae on the wings are nearly equal in length and lie flat on the surface. Full-grown larvae are 2.8-3.0 mm long, yellowish white, and they have distinct urogomphi. This species feeds on the dry rot fungus Serpula lacrymans (= Merulius) indoors.

Cellar beetle, Cryptophagus cellaris (Fig. 5.4d) Adult are 2.2-2.7 mm long and uniformly dark brown. The pronotum margin has a distinct tooth; fine setae on the wings are unequal in length and only some lay flat on the surface. This species is cosmopolitan and associated with stored foods in cellars and basements.

Figure 5.6 Coleoptera: Cucujidae. (a) Ahasverus advena; (b) Cathar-tus quadricollis; (c) Cryptolestes pusillus; (d) Oryzaephilus surinamensis; (e) O. mercator; (f) Silvanus planatus.

Other Cryptophagus Adults of C. varus are about 3.0 mm long and brown; the teeth on the pronotum are reduced. This species is distributed in northern USA and Canada, and has been recorded in stored-food products and rodent nests. C. valens adults are about 3 mm long and brown; the margin of the pronotum has an indistinct tooth medially. This species is cosmopolitan and is usually found in stored foods.

California fungus beetle, Henoticus californicus Adults are 3-9 mm long and uniformly pale brown; the body is moderately hairy, and the antennae have a three-segmented club. It has been distributed to various parts of the world through commercial shipping. Larvae and adults feed on the molds and fungi that grow on stored-food products.

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