Author: (Boulenger, 1911)
Comments: Inhabits shallow sandy region (Ref. 4983).  Feeds on sub-imaginal Ephemeroptera.  Isoptera and colonial blue-green algae were also found in a few specimens.  The occurrence of sub-imaginal or adult insects and planktonic blue-green algae, together with the absence of bottom debris suggests that <i>H. macrops</i> feeds at the surface or in mid-water (Ref. 558).