A revision of the neotropical aquatic beetle genus Stenhelmoides (Coleoptera: Elmidae) /
Spangler, Paul J.
A revision of the neotropical aquatic beetle genus Stenhelmoides (Coleoptera: Elmidae) / Paul J. Spangler and Philip D. Perkins. - Washington, D.C. : Smithsonian Institution Press, 1989. - 63 p. : ill. ; 28 cm. - Smithsonian contributions to zoology ; 479 .
A revision of the neotropical aquatic beetle genus Stenhelmoides (Coleoptera: Elmidae) / Paul J. Spangler and Philip D. Perkins. - Washington, D.C. : Smithsonian Institution Press, 1989. - 63 p. : ill. ; 28 cm. - Smithsonian contributions to zoology ; 479 .