| OCR Text |
Show 289 (Figs. 201-202); (3) general ground (4) and the frontal species, H. one and America, present throughout limbata abdomen Typical H. 1. Columbia, californica Texas, Oklahoma, Arkansas, is known the California, influence most of is and of to southern known from their intergrada Idaho. Typical Washington, and Idaho, Colorado. known from the typical ., 1. venusta and adjacent states. Specimens are but have indicating intergradation with characters generally of the other two limbata and H. venusta 1. anchor-shaped Typical . 1. color species have the and often while lateral indicated in the male abdominal distinct and well the arms intergrades of represented by the more one or between H. the of limbata . l. of markings limbata have markings (Fig. 208), Intergrades subspecies. are to referable Central Eaton from from southern Idaho diffuse The to presently assigned (Serville) Upholt is of the (1) Nymphs. (Serville) limbata northern Valley both pale; (Fig. 204). limbata (Serville) limbata British Oregon, 203. the species is represented by three subspecies in western North . Fig. th head rounded Hexagenia is in of Idaho. in This tion as six North American species genus, occur genitalia of process Of this male color 1. imagos by terga. pronounced the two sub anchor-shaped markings or less separated |
