Ideal section through an insect. -a, alimentary canal; h, heart; n, nerve-cord; s, stigmata; t, tracheal tubes; l, legs; w, wings.
John B. Smith Economic Entomology (Philadelphia and London: J.B. Lippincott Co, 1896)
2400×1472, 255.7 KiB
1024×628, 47.7 KiB
640×392, 26.7 KiB
320×196, 10.6 KiB