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The new species described here has been found in the dust of several houses in Japan and in two houses in Surinam. This new species differs from the single valid species of the genus Hirstia, H. chelidonis Hull, 1931 (=Dermatophagoides passericola Fain, 1964), in both sexes by the smaller size of the body and of the posterior legs; in the male by the relatively greater size of leg IV compared to leg III; in the female by the distinct sc1erotization of the cutic1e of the posterior region of the dorsum, especially around the d 5 and l 5 setae and immediately in front of the latter. ln 1950 and 1951, Sasa found from the sputum and urine of patients one female and one male mites, which were identified as Dermatophagoides sp. and D. saitoi (Sasa, 1947), respectively. It is presumed, however, that they are identical with the new species described in this paper. ln 1967 and 1970, Oshima found the fact that the mites of the present species abound· ed in house dust in Japan. The number of these mites ranged from 9 % to 18 % of total mites those existed in the house dust. In 1968, he described the present species and identified it with Mealia passericola (Fain, 1964) [=Hirstia chelidonis Hull, 1931J. Recently van Bronswijk also detected the present species in two houses in Surinam (Bronswijk, 1972). It was c1arified, however, that the present species was distinguished from H. chelidonis which materials are preserved in British rvluseum, and was new species. ** *s,~~~ : $ti8t*,~j;al2E~* CT 300-31 =!l:9ilt

Hirstia domicola sp. n. from house dust in Japan and Surinam : Acarina : Sarcoptiformes, Pyroglyphidae