西藏网翅蝗科两新种（直翅目：蝗总科）

TWO NEW SPECIES OF ARCYPTERIDAE FROM XIZANG

记述来自西藏贡嘎地区网翅蝗科两新种，即贡嘎牧草蝗Ｏｍｏｃｅｓｔｕｓｇｏｎｇｇａｒｅｎｓｉｓｓｎ．ｎｏｖ．及贡嘎缺耳蝗Ａｔｙｍｐａｎｕｍｇｏｎｇｇａｒｅｎｓｉｓｓｐ．ｎｏｖ．

in the present paper,two new species of Arcypteridae from Xizang are described.Type specimens are deposited in the institute of Zoology,Shanxi Normal University.Omocestus gonggarensis sp.nov.(figs.1￣3)This new species is allied to Omocestus motuoensis Yin and Omocestus cuonaensis Yin.It differs from both by:1)the length of foveola larger than the width about 1.87 times;2)the apex of elytra reaching the top of anaplate(♂)and the middle of fourth segment of abdomen(♀); 3) width of radial area of elytra of male larger than subcostal area about 4 times; 4)hind tibia ochreus.Length of body:♂10 mm;♀15.5mm.Length of elytra:♂ 5 mm;♀ 5. 5mm.Length of hind femur: ♂ 6. 5 mm;♀ 8mm.Holotype ♂,allotype ♀, Xizang: Gonggar,3600m,15.Ⅷ.1994,collected by Chen Bin.Atympanum gonggarensis sp.nov.figs.4￣6)This new species is very similar to Atympanum antennatum Yin,but differs from the latter in: 1)the length of foveola larger than the width about 2.5 times;2) hind sulcus of pronotum distinct,but not cuting the middle and lateral keels;3)legth of elytra larger than the width about 3.3 times;4)the width of interspace of mesosternum larger than the lenngth about 2.5 times.Length of body:♂16 mm;length of elytra:♀ 2 mm;length of hind femur:♀9.5mm.Holotype ♀,Xizang:Gonggar,3600m,15.Ⅷ.1994,collected by Chen Bin.