. Bulletin. Natural history; Natural history. 300 Illinois Natural History Survey Bulletin Fol. 22. Art. 2 Records for this species which have accumu- lated since the original description, in addition to those for the allotype, are as follows. CoLORAiK). — EsTES, Mill Creek: June 11, 1937. \i, 19. Oregon.—Ochoco Creek: May 3, 1939, 1?. Utah.—Bic Cottonwoods Canyon: April 24. 1937, G. F. Knowlton Sc F. C. Harmston, 1$. LotiAN Canyon: June 18, 1937. Knowl- ton & Nve, 19 ; April 23. 1938. W. P. Nye. 1(J, 19; April 19, 1940, R. E. Nye, 1^, 19- East of Daniels: June 4, 1940, Knowlton & Vans
. Bulletin. Natural history; Natural history. 300 Illinois Natural History Survey Bulletin Fol. 22. Art. 2 Records for this species which have accumu- lated since the original description, in addition to those for the allotype, are as follows. CoLORAiK). — EsTES, Mill Creek: June 11, 1937. \i, 19. Oregon.—Ochoco Creek: May 3, 1939, 1?. Utah.—Bic Cottonwoods Canyon: April 24. 1937, G. F. Knowlton Sc F. C. Harmston, 1$. LotiAN Canyon: June 18, 1937. Knowl- ton & Nve, 19 ; April 23. 1938. W. P. Nye. 1(J, 19; April 19, 1940, R. E. Nye, 1^, 19- East of Daniels: June 4, 1940, Knowlton & Vansell, 19. The above specimens confirm the state- ment made when the type, a specimen re- laxed from a pin mount, was described, that the submental gill as it occurs in Hydroperla and Ferlodes is lacking. How- e\er. there is a slight trace of a nipple- like projection at each outer posterior cor- ner of the submentum suggestive of an atrophied submental gill. A similar situa- tion is found in the case of Diploperla hastata (Banks) from eastern North America and other species of Diploperla. I now believe that the genus Dictyoptery- {/ella, including knowltoni, should be placed in the family Perlodidae, which is the family where this genus has been placed by recent P^uropean authors. 'I'he thoracic cervical sternites of ktioivl- toni, and various species of Ferlodes,. 9 subgenital Plate Fig. 72.—Dktyopterygella Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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