. Bulletin. Natural history; Natural history. ^^b III iNois Natirai. History Slrvi-v I'ol. 22, Art. 2 head, thorax and ahilonu-n, as illustrated in i\^. 113. Lcjis. antennae and anal cerci \ello\vish. Head with ocelli forming an almost equilateral triangle, median ocellus very- indistinct ; basal segments of mouthparts extending out from side of head. Labium, mandibles and maxillae as in fig. 112; maxilla is particularlv distinctive with its broad apical end and dense brush of stout setae in addition to the long, stout, curved outer process and much smaller, adjacent, inner spinelik
. Bulletin. Natural history; Natural history. ^^b III iNois Natirai. History Slrvi-v I'ol. 22, Art. 2 head, thorax and ahilonu-n, as illustrated in i\^. 113. Lcjis. antennae and anal cerci \ello\vish. Head with ocelli forming an almost equilateral triangle, median ocellus very- indistinct ; basal segments of mouthparts extending out from side of head. Labium, mandibles and maxillae as in fig. 112; maxilla is particularlv distinctive with its broad apical end and dense brush of stout setae in addition to the long, stout, curved outer process and much smaller, adjacent, inner spinelike process. Pronotum broader than long with markings as in fig. 113. Abdominal tergites having general back- ground bright yellow with dark longitudi- nal stripes, as in fig. 113; some scattered, stout, short setae on tergites in addition to row on posterior margin of each seg- ment. Cerci long, many segmented, seg- ments progressively longer from base to apex; a longitudinal row of long, fine setae on dorsal surface of apical segments in addition to smaller spinelike ones en- circling apex of each segment. Approximately mature specimens with body length of 13 mm. No thoracic, anal or submental gills. Nymphal and exuvial records are as fol- lows. Michigan.—Peacock, Little Manistee River: May 10, 1940. T. H. Prison & H. H. Ross, 1 exuvia. North of St. Icnace: May 11, 1940, T. H. Prison & H. H. Ross, 3 exuviae. Honor, Platte River: May 10, 1940, T. H. Prison & H. H. Ross, 3 exuviae; May 27, 1939, T. H. Prison & H. H. Ross, 2 exuviae. Rapid River, Rapid River: May 12, 1940, T. H. Prison & H. H. Ross, 1 nymph. Nova Scotia.—Moose River: Aug. 21, 1939, T. H. Prison & T. H. Prison, 1 exuvia. Tennessee.—, Le Conte Creek: May 14, 1939, T. H. Prison & H. H. Ross, 1 exuvia. The maxillae of the nymph and general features of the adult show that this new species belongs in that gr(jup or subgenus of Isoperla {) which includes marlynia Nee
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