Entomology : with special reference to its biological and economic aspects . Pteronarcys regalis. A, nymph (after Newport) ; Fig. 19. B, imago. Slightly Hexagenia variabilis. A, nymph; B, imago. Natural size. CLASSIFICATION but including a subpupa stage. Mouth parts suctorial. Pro-thorax long. Tarsus terminating in a bladder-like organ. Fig. 20.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1