纤恙螨属一新种（蜱螨亚纲：恙螨科）

A NEW SPECIES OF THE LEPTOTROMBIDIUMFROM QINGHAI, CHINA(ACARI: TROMBICULIDAE )

本文描述纤恙螨属ＬｅｐｔｏｔｒｏｍｂｉｄｉｕｍＮａｇａｙｏｅｔａｌ，１９１６，一新种，五角纤恙螨Ｌｅｐｔｏｔｒｏｍｂｉｄｉｕｍｐｅｎｔｒａｇｏｎｕｍｓｐ．ｎｏｖ，标本采自青海省玉树藏族自治州称多县。

Leptotrombidium pentagonum sp. nov. (Figs. 1-4)Body orange when alive, elongate elliptical. Idiosoma length 300 (270-360), width 223(192--250 ). SIF = 7B-B-3-2111-0000, Palpal setae fomula N. N. (b ) NN/7B. Galeal setabranched. Palpotibial dorsal seta branches small. Scutum nearly pentagonal shaped; anteriormargin straight, posteromargin prominently rounded. Sensillae 1 /3 branches 8--10. PW/SD =1. 81, PLMAM>AL, SB/PLs. Eyes 2+ 2. Dorsal setae 86-99 in number,arranged as 6. 18.13. 16. 18. 14. 8. 4. 2 = 99, 6. 16. 18. 14. 12. 6. 4. 2 = 86. Sternal setae 2. 2. Ventral setae56al8= 74-76. NDV= 173(154-173). Coxal setae I. I. I,legs; I= 300 Ⅱ = 250 Ⅲ = 340. IP= 890.Holotype and 19 paratypes, larvae collected off Microtus foscus Buchner 1889. Sept. 10,1 990,Yushu County (33°44'N, 96°36' E ), Qinghai Province. The type specimens are all deposited in the Research Institute of Endemic Disease Control,Qinghai Province.This new species resemblas to L. (L. ) dihumerale Traub et Nadchatram 1967,but scutum nearly pentagonal in shape. Humeral setae 2-3 couple, fp = N. N. (b ) NN, AW =85PW= 100. 8 SB= 39 PSP= 23 NDV= 173.