FIGURES 39–42 in New Neotropical and Nearctic species of water beetles in the genera Hydraena Kugelann and Ochthebius Leach, a key to North American genera and subgenera of the family, new distribution records, and a synopsis of ecology, behavior and morphology related to aquatic life (Coleoptera: Hydraenidae)

FIGURES 39–42. Behavior and morphology of exocrine secretion delivery systems of Hydraena and Ochthebius. 39–40) Hydraena americana Jäch. 39) Schematic. a) Beetle balanced on edge, tibiae of the right legs resting on the surface of a wet leaf, the left legs performing secretion-grooming. b) Secretion-grooming movements of left tibiae (note pivotal role of middle leg). c) Locations of exocrine gland pore areas. 40) Venter of left side of prothorax, external and internal, showing components of exocrine secretion delivery system. 41) Ochthebius arenicolus Perkins, ventral aspect of head and prothorax. 42) Ochthebius glaber Montes & Soler, ventral aspect of left side of head and adjacent area of prothorax, showing external cuticular features of antennal pocket and internal end-apparatus and ductules. For more context and SEMs see Perkins (1997).