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vertex-arc
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     vertex long;
     头顶较长 ;
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     2. Vertex arboricity.
     2.点荫度。
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     The Vertex-Coloring Formula of the Regular Polyhedron
     正多面体的顶点着色公式
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     Product of weakly vertex-transitive graphs
     弱点传递图的乘积
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     C arc furnace.
     二是研制了三相交流电弧炉的仿真试验系统。
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Two new species of Tetrix Latreille from Shanxi and Neimongol were reported. Type specimens were deposited in the Institute of Zoology, Shanxi Normal University. Tetrix xianensis sp. nov. (figs. 1 ̄3) This new species is similar to Tetrix grossovalus Zheng and Tetrix bolivari Saulcy. It differs from both in : 1) hind process of pronotum slightly beyond the top of hind femur; 2) between the shoulders of pronotum with a wide yellow brown band; 3) in the middle of hind femur with a yellow spot....

Two new species of Tetrix Latreille from Shanxi and Neimongol were reported. Type specimens were deposited in the Institute of Zoology, Shanxi Normal University. Tetrix xianensis sp. nov. (figs. 1 ̄3) This new species is similar to Tetrix grossovalus Zheng and Tetrix bolivari Saulcy. It differs from both in : 1) hind process of pronotum slightly beyond the top of hind femur; 2) between the shoulders of pronotum with a wide yellow brown band; 3) in the middle of hind femur with a yellow spot. It differs from the former by the width of vertex narrower than the width of an eye. It differs from the latter by the top of upper valvue of ovipositor not hookshape, upper margin smooth. Length of body:♀ 11 mm; length of pronotum;♀ 9 mm; length of hind femur: ♀ 7 mm. Holotype ♀, Shanxi: Xian, Х.28. 1990, collected by Xu Zhenghui. Tetrix duolunensis sp. nov. (figs. 4 ̄5) This new species is allied to Tetrix kunmingensis Zheng et Ou, but differs in : 1) anterior margin of vertex arc, slightly protruding before the eye; 2) the width of sulcus of front ridge between the antennae wider than the width of basal segment of antenna; 3) without a pair of longitudinal keels between the shoulders. Length of body:6 ̄7 mm,♀ 8 ̄9 mm. Length of pronotum:5.5 ̄6 mm, ♀ 6 ̄8 mm. Length of hind femur:4.5 ̄5 mm, ♀ 5.5 ̄6 mm Holotype ♀, allotype , paratypes 30, 36 ♀♀, Neimongol: Duolun, Ⅳ.29, 1994, collected by Ren Guodon.

记述采自内蒙古的多伦蚱Tetrixduolunensissp.nov.及采自西安的西安蚱Tetrixxianensissp.nov.二新种,且额蚱TetrixeyouqiensisLiang雄性首次描述.模式标本保存于陕西师范大学动物研究所

 
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