. Bulletin. Natural history; Natural history. 9 subgenital Plate Fig. 72.—Dktyopterygella Fig. 73.—Nymph of Dictyoptrrygella knoxiltorii. Hydroperla and Perla, possess weakly scle- rotized folds or bulbous areas which prob- ably play a part in respiration. In the original description of the male of k/iou'ltrj/ii (Prison 1937), an error oc- curs in regard to comparative lengths of tarsal segments. This statement should read: first and second tarsal segments to- gether about one-half as long as third, first tarsal segment longer than the second. Among a lot of stonefly specimens len
. Bulletin. Natural history; Natural history. 9 subgenital Plate Fig. 72.—Dktyopterygella Fig. 73.—Nymph of Dictyoptrrygella knoxiltorii. Hydroperla and Perla, possess weakly scle- rotized folds or bulbous areas which prob- ably play a part in respiration. In the original description of the male of k/iou'ltrj/ii (Prison 1937), an error oc- curs in regard to comparative lengths of tarsal segments. This statement should read: first and second tarsal segments to- gether about one-half as long as third, first tarsal segment longer than the second. Among a lot of stonefly specimens lent to Dr. W. E. Ricker by the Canadian National Collection, Ottawa, Canada, and subsequently sent me for examination, are nymphs, adult females and an exuvia. 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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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
