PROC. ENTOMOL. SOC. WASH. 80(3), 1978, pp. 335-343 A NEW SPECIES OF PSEUDOPYGMEPHORUS (ACARI: PYGMEPHORIDAE) ASSOCIATED WITH COMMERCIAL MUSHROOM PRODUCTION Aagje Hill and Kenneth L. Deahl Abstract. — Both sexes of a new species of Pygmephoiidae, Pseiido-pygmephorus smileyi, from horse manure around commercial mushroom production houses in Pennsylvania are described and figured. Mites associated with commercial mushroom production were studied at the Beltsville Agricultural Research Center in 1976. Most of the mites were collected from compost and horse manure around and in the mushroom houses near Kennett Square, Pennsylvania. This work was done in collabora-tion with the Systematic Entomology Laboratory, IIBIII, Agricultural Re-search Service, U.S. Department of Agriculture, Beltsville, Maryland 20705. Several species of mites belonging to the family Pygmephoridae and Tarsonemidae were found. Among them were males and females of an undescribed species of Pseudopygmephorus, and these are described here. As far as we know, this is the third species in this genus for which males are known. The temiinologies of Mahunka (1973) and Norton and Ide (1974) are used for the idiosomal structures, leg chaetotaxy and solenidiotaxy. Pseudopygmepliorus smileyi Hill and Deahl, new species The female of this species resembles the female of Pseudopygmephorus sellnicki (Krczal, 1959) in having similarly curved dorsal terga. It can be separated from the latter species by the absence of strong spinelike setae on tarsi II and III. Smiley (1978) describes the male of P. sellnicki. The male of P. smileyi differs from the male of P. sellnicki in having slender setae rather than strong spines on tarsi II and III. Female Figs. 1-6 Gnathosonm (Fig. 1). — Slightly elongate with 2 pairs of simple dorsal setae, anteromedial pair longest. Palpus with 1 segment, dorsally with 2 pairs of simple setae, ventrally with 1 small solenidion and a larger sucking-like apparatus. Dorsum (Fig. 1). — Propodosoma convex anteriorly, with concave margins, rather small in comparison to body. Exobothridial setae (exo) longer than distance between bases. Interbothridial setae (in) very small, without spicules. Rostral setae lacking. Setae c^ on tergum I longer than exo setae;
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