西藏南部恙螨三新种（蜱螨亚纲：前气门目）

THREE NEW SPECIES OF CHIGGER MITES FROM SOUTHERNXIZANG(ACARI:TRIOMBICULIDAE)

本文记述采自西藏南部小型哺乳动物体上的恙螨三新种，分别隶属恙螨科（ＴｒｏｍｂｉｃｕｌｉｄａｅＥｗｉｎｇ，１９４４）的棒六恙螨属（ＳｃｈｏｅｎｇａｓｔｉｅｌｌａＨｉｒｓｔ，１９１５）毫前恙螨属（ＷａｌｃｈｉｅｌｌａＦｕｌｌｅｒ，１８５２）和新恙螨属（ＮｅｏｔｒｏｍｂｉｃｕｌａＨｉｒｓｔ，１９２５）。模式标本保存于军事医学科学院微生物流行病研究所医学昆虫标本馆。

This paper reports three new species of chigger mites collected off small mammalsftom southern Xizang.Their morphlogical features are compared with the similar species. All type specimens are depositeti in the Medical Entomology Collection Gallary,Institute ofMicrobiology and Epidemiology,Academy of Military Medical Sciences,Beijing of China.1.Schoengastiella gongrii,sp;nov,(Figs.1- 4) Body ovate,length 321- 587μm,width 433- 494μm,Engorged larva with slightcontraction behind leg Ⅲ.fp=B- B-NNN,Gr=3,fT =4B,Ga= N,Scutum long-pantagonal.Eyelxl.sensilla globose.AW47,PW53,PPw21,SB34,ASB19,PSB92,AP39,AL34,PL51,PPL51,Sens34×14.Ds=51-53,VS=84,fst=2.2,fCx=1.1.3.SLF=4B-N-2100.0000.Holotype and 3 paratypes collected off Rattus eha from Gongri,Cuona,May 23,1992;This new species is similar to Schdeng a stiella xizang ensis Wu et Wen, 1984 and S.qomolangma Wu et Wen, 1984,but the former with fp=B-E-NNN and fCx=1.1.3.2.Walchiella xui,sp.nov,(Figs. 5-8)Body ovate, length 285μm,width 207μ,fp=N,scutum trapezoidal,sensilla lanceolate,AM>PL=AL,Eye2×2.Aw65,PW88,SE36,ASB 28,PSB 30,AP 35,AM 56,AL 42,PL42.sens 72×5.DS=26,Vs=20,fst =2.2,fcx=1.1.1.SIF=7B.s-N-3-3111.000.Holotype colleeted off Pity my s sikimensis from Yadong,May 23,1992.This new species is similar to Walchiella zang shui Wen et Wu,1984 and W, xizangensis Wu et Wen,1984,but the former with fp=N-N-NNB and fDv=46.3.Neotrrombicula longisensilla, sp.nov.(Figs,9-12)Body ovate,length 287μm,width 234μm, fp=N-N-BNB,Gr=3,fT =7B,S,Ga=B. Scutum pentagonal,PL>AM>AL,Eye 2× 2.Sensilla long-whip-like. Aw 80, PW100, SB 28, ASB 37,PSB 33, AP 30,AM 58,AL 55,PL 65, Sens 112(left),127 (right).Ds=32-36,VS=41, fst=2.2,fCx=1.1.1. SIF=7B.s-B-3-2111.2101 Holotype and l paratype collected off Pitymys sikimensis from Gongri,June 25,1993.This new species is similar to Neotrombicula microtomici Wen et al.,1984,but theformer with long whip-like sensillae and longer PSB.