. Bulletin. Natural history; Natural history. Scptcmlx-r \'IM PRISON: DESCRIPTIONS OF STONEFLIES 81 iidf;c. Labium and maxillae approximatel) the same as described for other members of the genus. Proiiotum about twice as wide as long, all angles well rounded. Legs, tarsal seg- ments and cerci approximately the same as described for other species of the genus. Two pairs of gill tufts on each thoracic segment placed as in Acrotieuria internatn (Prison 1935a, fig. 266). No submental gills. Caudal gills at apex of abdomen are present. Approximately mature specimens with a body length, exclusive of
. Bulletin. Natural history; Natural history. Scptcmlx-r \'IM PRISON: DESCRIPTIONS OF STONEFLIES 81 iidf;c. Labium and maxillae approximatel) the same as described for other members of the genus. Proiiotum about twice as wide as long, all angles well rounded. Legs, tarsal seg- ments and cerci approximately the same as described for other species of the genus. Two pairs of gill tufts on each thoracic segment placed as in Acrotieuria internatn (Prison 1935a, fig. 266). No submental gills. Caudal gills at apex of abdomen are present. Approximately mature specimens with a body length, exclusive of appendages, of about 22 mm. Nymphs and exuviae.—All from the White river, near Rogers, Portersville and Peters- burg, Ind., collected trom one to several weeks prior to emergence ot reared adults recorded above. This species has been described as ne\\" with full knowledge that a few specimens of the same species in other collections ha\ e been determined in the past as peimsyl- rniiica (Rambur). This specific name has been applied to so many different species, however, and so much doubt exists regard- ing the important structural details of the type, if still in existence, that clarity and certainty in diagnostic work cannot be ob- tained at the present time by the use of this old name. It has seemer best, therefore, in \iew of the fact that my specimens of male, female and nymph are reliably associated upon the basis of reared material, to name my specimens as new. If ever the type of pi'iinsyh'anica Rambur is definitely proved to be the same as the species I am now nam- ing, then my name can be shelved in syn- onymy. Meanwhile the present species will not have been confused with other forms going under the same name. In my Illinois report (Frison 1935a, p. 395 ) a single adult female specimen of this species from Shawneetown, III., June 21, 1927, was erroneously recorded as iib- norrnis. Due at the time to the lack of additional Illinois material and knowledge of the
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