【摘要】 <正> 穗螨属(Siteroptes Kirchner,1864)是蒲螨科(Pyemotidae)内较古老的一个属,目前已知30余种。 1974—1976年我们对青海省及东部毗邻农业区进行了调查,发现穗螨5种,其中3种为新种,2种是我国新纪录。 新种的模式标本均保存于青海省生物研究所。更多还原

【Abstract】 Three new species and two new records of the genus Siteroptes are described andfigured, namely S. qinghaiensis Su, sp. nov., S. trit colae Su, sp. nov., S. huangshuien-sis Su, sp. nov., S. avenae Muller and S. reniformis Krantz. The mites, as vectors ofplant diseases, are all associated with ear rot of grasses and grains, and each of themlives symbiotically with a certain fungus. A key of seven species is appended. All type specimens are deposited in the Qinghai Institute of Biology. Siteroptes qinghaiensis Su, sp. nov.（figs. 1--9） With respect to the arrangement of dorsal selerities and chaetotaxy, the speciesis similar to S. graminisugus, but distinguished by: Female setae of internal humerales, dorsales, lumbales unequal, and setae oflumbales more than one and a half times as long as setae of internal humerales; setaeof medial caudales typically absent; setae of external coxales 11 longer than the in-ternals; sacks of the sporotheca large, averaging 40--53μ long by 17--21μ wide; open ends of the organ connected by a reversed triangular structure form two broken lines. Male setae of external humerales shorter, averaging 20--31μ in length; posteriormarginal apodeme complete; solenidion φ₂ on tibia I and solenidion φ on tibia IVbaculiform, and distinctly longer; setae l on tibia IV less than half of solenidion φ;genu I with four setae; anterior margin of the hysterosomal shield II complete. Holotype ; allotype ; paratypes 10 , 10 . Host: Avena fatua. Locality: Xining, Qinghai Province, 2261 m., 1976. VI. 24. （Su Ti-zhi）. Siteroptes triticola Su, sp. nov. （figs. 10--16） The new species is similar to S. avenae in some repects; but separated from itmainly through the following: Female setae of lumbales about two times as long as setae of internal humeralesand dorsales; setae of internal coxales Ⅱ longer than the externals; solenidiona ω₁located behind setae of tk and ω₂ behind tb on tarsus l; open parts of the sporothecaare connected by a transverse fold. Male setae of internal verticales extraordinarily short, 2.8μ; a distinct, irregularapodemelike thickening on propodosomal shield and hysterosomal shield l respectively;setae of lumbales more than two times as long as setae of internal humerales; hys-terosomal shield ll almost rectangular, broader than long and thickened lateraly; soleni-dion ω₁ located behind setae tk and ω₂ behind tb on tarsus l; solenidion φ₂ on tibial baculiform; solenidion φ on tibia IV shorter, and setae l more than half as longas the solenidion. Holotype ; allotype ; paratypes 10 , 10 . Host: Triticum aestivum. Locality: Dulan, Qinghai Province, 2900m., 1976. VII. 15. （Su Ti-zhi）. Siteroptes huangshuiensis Su, sp. nov. （figs. 17--23） The mite, especially the female, resembles S. cerealium, but differs from it mainlyby: Female posterior marginal apodeme medially and sternum caudally complete;solenidion φ₂ of tibia l located behind φ₁; atrium and stigma about equal in length. Male solenidion φ₂ on tibia l longer （6--8μ）, baculiform; solenidion φ on tibiall equal to solenidion ω on tarsus ll in length （4, 3μ）; solenidion φ₂ on tibia IV distinct-ly longer, 10-12μ; a cruciate apodemelike thickening present on hysterosomal shieldl; dorsal plate on the genitoanal region broad obovate; sternum complete caudally. Holotype ; allotype ; paratypes 10 , 10 . Host: Avena fatua. Locality: Xining, Qinghai Province, 2261 m.) 1976. VI. 24. （Su Tizhi）. Siteroptes avenae （Muller, 1905） Collected from Xining and Huangyuan, Qinghai Province, on Aneurolepidium da-systachys, Chinelymus nutans, Triticum aestivum. Siteroptes reniformis （Krantz, 1957） Collected from Xining, Qinghai Province on Avena fatua.更多还原