The fishes of Illinois, Danville, Ill, Published by authority of the state Legislature, 1908, fishes, Illinois, Lydia M Hart, Hadropterus aspro, blackside darter, Hadropterus phoxocephalus, women in science, The illustration showcases two species of fish, positioned one above the other. The first, labeled 'Black-Sided Darter' (Haderpterus nigrus), displays a distinctive pattern of dark horizontal stripes along its body, complemented by a light-colored underbelly. Its elongated shape and prominent dorsal fin contribute to its streamlined appearance. Below, the second species, Haderpterus photophilus, features a more muted coloration with subtle markings, showcasing a faint pattern along its length. Both specimens are depicted in a way that highlights their unique physical characteristics, emphasizing their fins and body shapes, with labels identifying each species. The composition underscores the diversity within the Haderpterus