摘要
Two new species of the genus Pseudovolucella Shiraki are described from Sichuan in China： P. hengduanshanensis sp. nov. and P. dimorpha sp. nov. These two new species are similar to P. decipiens and P. ochracea as reviewed by Reemer and Hippa（2008）. The males of these 4 species have black abdominal tergite 4, P. decipiens has the hind femur of male with a small apicoventral knob, but the new species and P. ochracea have the hind femora of males straight on ventral margins showing that they are more similar to P. ochracea. However, P. hengduanshanensis sp. nov. is distinguished from P. ochracea by face absent of dark brown median vitta, abdominal tergite 2 with a pair of broad yellow basal fasciae separated narrowly in the middle, tergite 3 in male and tergites 3 and 4 in female respectively with a pair of yellow narrow fasciae（P. ochracea has the face with a broad middle dark brown to black vitta diverging above and fading away the paler color, abdominal tergite 2 is wholly pale brownish yellow on basal 2/3, the remainder of tergites shining black, female unknown）. P. dimorpha sp. nov. differs from P. ochracea with abdominal tergite 2 in male and tergites 2, 3 and 4 in female with a pair of yellow narrow fasciae respectively（abdominal characters of P. ochracea see above）. Additionally, the male terminalia of these two new species are different.
记述中国四川蚜蝇科昆虫2新种:横断山拟蜂蚜蝇,新种Pseudovolucella hengduanshanensis sp.nov.和二态拟蜂蚜蝇,新种Pseudovolucella dimorpha sp.nov.。依据Reemer等(2008)检索表,2新种近似P.decipiens和P.ochracea,它们的雄性第4背板均为黑色,P.decipiens雄性后足腿节端部腹侧具突起,2新种与P.ochracea后足腿节端部腹缘平直,因此新种更接近后者。横断山拟蜂蚜蝇,新种Pseudovolucella hengduanshanensis sp.nov.与P.ochracea的区别在于新种颜缺暗褐色中条纹,两性腹部第2背板基部具1对黄斑,雄性第3背板、雌性第3、4背板具1对黄斑(P.ochracea雄性颜具暗褐色至黑色上端宽下端狭的中条纹,腹部第2背板基部2/3浅黄褐色,其余背板黑色,雌性未知);二态拟蜂蚜蝇Pseudovolucella dimorpha sp.nov.与P.ochracea区别在于雄性腹部仅第2背板具1对狭黄斑,雌性第2~4背板各具1对分离的黄斑(P.ochracea雄性腹部特征见上述)。三者雄性尾器显著不同。
基金
supported by Conservation International(Insect Resource Survey in Anzihe Protected Area.)
