寄螨亚科6已知种补充描述（蜱螨亚纲：革螨股）

Supplemental Descriptions of Six Known Species of the Subfamily Parasitinae （Acari：Gamasina）

对短毛寄螨Parasitus brachychaetus Ma，1986；王氏寄螨Parasitus wangdunqingi Ma,1995；二刺寄螨Parasitus bispinatus Ma，1996；北方糙革螨Trachygamasus borealis Ma et Wang，1996；三尖常革螨Vulgarogamasus trifidus Ma,1987和甘肃常革螨Vulgarogamasus gansuensis Ma，1987进行了补充描述。

1. Parasitus brachychaetus Ma, 1986 （Figs. 1-7） （Redescription）. Length 942μm, width 575 μm. Anterior dorsal shield bearing about 20 pairs of setae, M2, F1, D1 and D3 pilose distally, remains simple. Posterior dorsal shield bearing about 26 pairs of setae, pilose distally or simple. Sternal region with 1 pair of triangular sclerites. St, bifurcate, on small shields. Genital region shown in fig. 2. Ventro-anal shield setae simple, but 1 pair of which at posterior part pilose distally. Ad situated at level of posterior margin of anus, longer than anus, PA longer than Ad, pilose distally. Tectum 3-pronged. Movable digit of chela tridentate, fixed digit with a row of small denticles. Setae al on palpfemur bifurcate, all and a12 on palpgenu spoon-shaped. Tarsus Ⅱ-Ⅳ with 4 distal spines respectively. Specimen 1 ♀ , offMarmota himalayana （Hodgson）, from Oula （34° 06′ N, 101° 43′ E）, Gansu Province, Aug. 5, 1960. 2. Parasitus wangdunqingi Ma, 1995 （Figs. 8-11） （Supplemental character）. The female with 4 blunt spines in the genital cavity, but some spines tridentate in shape, some spines increased or decreased in numbers. Specimens 4 ♀♀ , ex humus soil, from Baicheng （45° 37′ N,122° 49′ E）,Jilin Province, Apr. 1992. 3. Parasitus bispinatus Ma, 1996 （Figs. 12-14） Larva. Idiosoma 340-440 （av. 373） μm long, 200-280 （av. 240） μm wide. Dorsal setae 18 pairs. Venter with 6 pairs ofsetae except perianal setae. Ad long, PA still longer. Stigma and peritreme absent. Movable digit of chela tridentate. Legs 3 pairs. Specimens 4 ♀♀ , 2♂♂, 8 deutonymphs, 6 protonymphs and 3 larvae, ex tree hole of poplar, from Baicheng （45° 37′ N, 122° 4′ E）, Jilin Province, Aug. 14, 1994. 4. Trachygamasus borealis Ma et Wang, 1996 （Figs. 15-19） Adult （Supplemental characters）. In female, venter with 1 pair of minute setae near to postero-lateral angles of genital shield; ventro-anal shield with 6 pairs of ventral setae, last a pair of which brush-like; some posterior ventral cuticle setae also brush-shaped. Femur Ⅱ of male with 2 small spurs, genu Ⅱ and tibia Ⅱ with 1 small spur respectively. Deutonymph. Length 391 μm , width 218 μm. Anterior dorsal shield bearing 21 pairs of short setae, but D1, D3 and M2 brush-shaped. Posterior dorsal shield with 13 pairs of short setae, of which 1 pair at postero-lateral margins brush-like. Presternal shields 1 pair, triangular. Sternal shield with 4 pairs of setae and 3 pairs of pores. Ad situated at level of middle of anus, both Ad and PA subequal to anus in length. Peritreme broad anteriorly, reaching before anterior margin of coax I. Specimens 1 ♀ , 1 ♂ and 1 deutonymph, ex litter, from Linjiang County （41° 50′ N, 126° 51′ E）, Jilin Province, Aug. 13, 2002. 5. Vulgarogamasus trifidus Ma, 1987 （Fig. 20） Adult（Supplemental character）. This species very similar to Vulgarogamasus oudemansi （Berlese, 1904）, difference between two species is： both palptrochanteral setae of the former species normal in shape （fig. 20）, but male of the latter species one palptrochanteral seta normal, the other spine-shaped. Supplemental character according to allotype and male paratypes. 6. Vulgarogamasus gansuensis Ma, 1987 （fig. 21） （Supplemental character）. The tectum shown in fig. 21, with 3 prongs, median prong variable （median prong of tectum of holotype beak-shaped distally）. Specimen 1 ♀ , off Marmota himalayana（Hodgson）, from Gahai （34° 15′ N, 102° 23′ E）, Gansu Province, May 1960.