西藏纤恙螨属四新种（蜱螨亚纲：前气门目）

FOUR NEW SPECIES OF THE GENUS LEPTOTROMBIDIRM FROM XIZANG OF CHINA(ACARI:TROMBICULIDAE)

本文记述了采自西藏小型动物体上的恙螨四新种，隶属恙螨科（ＴｒｏｍｂｉｃｕｌｉｄａｅＥｗｉｎｇ，１９４４）的纤恙螨属（ＬｅｐｔｏｔｒｏｍｂｉｄｉｕｍＮａｇａｙｏｅｔａｌ．，１９１６）。模式标本保存于军事医学科学院微生物流行病学研究所医学昆虫标本馆，部分副模标本存第一作者所在单位。

This paper reports four new species of chigger mites collected off small animalsfrom Xizang of China. The type specimens are deposited in the Medical EntomologyCollection Gallery, Institute of Microbiology and Epidemiology Academy of MillitaryMedical Sciences , Beijing of China, Some of the paratypes are kept in the Sanitation and Anti-Epidemic Team of PLA , Cheng of China.1. Leptotrombidium(L.)shuminense Zhang, Wang et Deng,sp.nov.(Fig.1).Body elliptical,length 252-339 μm,width 205-302μm, fp=N-N-BNN, Gr=3,fT=7B, Ga=B, Scutum subrectangular.Sensilla filiform, Eyes 2×2. AW 81, PW 96 , SB35,ASB 39,PSB 17,AP 37, PS 30,AM 79,AL 59, PL 77, Sn 89.DS=66-83, VS=62-74.SIF=7B-B-3-2111.0000.Holotype collected off Rattus niviventer from Nyalam county of Xizang , September 14,1987.This new species is similar to Leptotrombidium (L)scutellare Nagayo et al., 1921, butit differs ftom the latter in(1) the scutum obviously larger;(2) the dorsal and ventral setaeabuntant.2.Lep totrombidium (L.) youyi Zhang,Wang et Deng,sp nov,(Fig.2).Body length 268-356μm,width 210-255μm, fp=N-N-BNN(b), fT=7B,Ga=B, Scutum subrectangular,Sensilla filiform. AW 64 , PW 72 , SB 25 ,ASB 25 , PSB 15, AP24,PS 24,AM 59,AL 47,PL 60,Sn 84.DS=28-29.VS=21-23.SIF=7B-B-3-2111.0000.Holotype collected off Rattus nitidus from youyi bridge , Nyalam county of Xizang,September 8, 1987.This new species is similar to Leptotrombidium,(L.)chuanxi Wen et al,1984,but itdiffers fron、the latter in(1) scutum subrectangular,posteromargin without protrusion,(2)SB smaller and PSB shorter,(3)AP about the same as PS.3. Leptotrombidium (L.)vesp ertilum Zhang, Wang et Deng , sp. nov,(Fig.3).Body elliptical , length 638-761 μm, width 487-638μm. fp=N-N-BNN, fT =7B,Ga=B. Scutum subrectangular. Sensilla filiform, bare near the base. SB lightly below thePLs.AW 79,PW 87,SB 34,ASB 25,PSE18,AP 27,PS 29,AM 52,AL 40,PL 60,Sn71 .DS=39-41,VS=33-38. fst=2.2.fCx=1.1.1.SIF=7B-B-3-2111.0000,Holotype collected off bat(Chiroptera sp. ) from Yadong county of Xizang,May 31,1989.This new species is similar to Leptotrombidium (L.) cuonae Wang, Pan et Yan , 1996,but It differs from the latter in(1) bat host,(2)much more dorsal and ventral setae innumber,dorsal setae arranged difference obviously.4. Leptotrombidium (L. ) zhangmuense Zhang, Wang et Deng, sp. nov,(Figs.4-6)Body length 244-336μm.width 190-252μm.fp=N-N-BNN,Gr=3, fT=7B, Ga=B . Scutum subrectangular,Sensilla filiform,AW 62 , PW 72, SB 29,PSB 12, ASB 29,AP 24,PS 24,AM 47,AL 40,PL 54,Sn 67.DS=34-36.VS=29-31. fst=2.2.fCx=1.1.1.SIF=7B-B-3-2111.0000. Holotype collected off Rattus uitidus from Zhangmu , Nyalam county of Xizang,Semptember 21, 1987.This new species is similar to Leptotrombidium (L.) rattistae Wen et al.,1984,but itdiffers from the latter in(1) scutum larger,(2) scutal and dorsal setae long and plumose,(3) DS= 34-36 , the second row of dorsal setae 10 in number,(4) with two branshes aboutat one half of sensilla.