本州から記載され海外では台湾から知られている。マメ科のコマツナギ Indigofera pseudotinctoria、ヤハズソウ Kummerowia striataに見られる。本州には様々なマメ科に見られるハラオビアザミウマH. abdominalisも分布するが、本種は腹部の黄色の帯が2節（第4-5節）であるのに対し、ハラオビアザミウマは黄色の帯は1節（第5節）であることでルーペでも容易に識別できる。

This species was described from Honshu, Japan but is also known in Taiwan. It occurs on Indigofera pseudotinctoria and Kummerowia striata [Fabaceae] in Japan. In Honshu, H. abdominalis, which occurs on several Fabaceae, is also distributed but H. ekasi can be easily distinguished from H. abdominalis by the abdomen with two yellow segments (segments IV-V), whereas the abdomen with one yellow segment (segment V) in the latter species, even though by loupe.

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  Female

  

  Female

  

  Female

  

  Female

  

  Female head and thorax

  

  Female head and thorax

  

  Habitat：Indigofera pseudotinctoria コマツナギ