The individuals are very numerous; but they appear to belong to a small number of species, some of which were referred by Agassiz to the genera leuciscus, Aspius, and Perca.
"The Student's Elements of Geology"
Sir Charles Lyell
The other species of this genus inhabiting adjacent and other countries are H. Pileatus and H. leucogenys in Siam; H. leuciscus, Java; H. Mulleri and H. concolor, Borneo.
"Natural History of the Mammalia of India and Ceylon"
Robert A. Sterndale