A new species in the genus Ptygomastax Bey-Bienko,Ptygomastax jiuzhiensis sp.nov.,collected from Qinghai in China,is described and illustrated.This new species is similar to Ptygomastax heimahoensis Cheng and Han,but some notable differences are found for this new species that frontal ridge nearly parallel between antennae and the color of median longitudinal carina on occiput and tergum distinct from body colour,the carina on occiput black,the carina on tergum light green,while body black brown.The type specimens were stored in Quanzhou Normal University.
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