Two new species of Collembola are described, full body chaetotaxy is given. Ptenothrix dalii sp. nov. and Seira pietata sp. nov. were originally found in metalogenic areas covered with transitional vegetation of savanna and forest in Minas Gerais, Southeastern Brazil. Ptenothrix dalii sp. nov. is part of the “gracilis-group” of species, with large, blunt macrochaetae on head and body. Seira pietata sp. nov. is part of the “andensis-group” of species, lacking macrochaeta on abdominal segment I.

中文翻译：

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巴西米纳斯吉拉斯州的Collembola（节肢动物：六足纲）的两个新种。

描述了两个新的Collembola种类，给出了全身照护术。Ptenothrix dalii sp。十一月 和Seira pietata sp。十一月 最初是在巴西东南部的米纳斯吉拉斯州的大草原和森林过渡植被覆盖的成矿区发现的。Ptenothrix dalii sp。十一月 是物种的“ gracilis-group”的一部分，头和身体上有大而钝的巨纲。Seira pietata sp。十一月 属于物种“ andensis-group”的一部分，在腹部I段缺少巨macro。