The insect seen here is called the "water" type of this word that also follows "Volga" in song
[DOC] [TLE] Some Films Not Yet Named to the Registry - National Film ... [PAR] ... Lad from Old Ireland (1910); The New Magdalene (1910); A Plain Song (1910) 
... War on the Plains (1912); Water Nymph, The (1912); What Happened to Mary?