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The previously unknown terrestrial pupa of Architremma ulachensis Mart, is described. Larvae of this species metamorphose in the layer of Sphagnum moss on the spring bank. The pupa is characterized by morphological reductions: absence of long setae and projections to clean the silk disks which...
The life history and production of the stonefly Isoperla signata (Banks) was studied in a central Wisconsin trout stream for one year. Adults exhibited a 2 week spontaneous emergence beginning in early May when mean daily stream temperatures were approximately 10°C. Emergence was completed and...
From analyses of monthly length frequency distributions, univoltine life cycles were described for Sialis dreisbachi, Stenonema vicarium, and Dicranota sp. from stream riffles. Stream drift of immature S. dreisbachi and S. vicarium peaked near the ends of their life cycles in the spring. Drift...
Ochthebius (Hymenodes) subdifficilis sp. n., O. (H.) wewalkai sp. n., and O. (H.) orchymonti sp. n. are described. O. (H.) difficilis Mulsant is compared. O. (H.) schneideri Kuwert is redescribed from syntypes and a lectotype is designated. All species mentioned are similar to O. difficilis and...
Notophlebia jobi new species is described from imagines and nymphs collected in Tamil Nadu State (= Madras State), India. The nymph originally assigned to Nathanella by Peters and Edmunds (1970) is reassigned as the nymph of Notophlebia. Phylogenetic relationships of Notophlebia are discussed.
148 species of Chironomids found in a section of the Po river (Italy), between 1967 and 1982, are listed. The relationships between sampling device, substrate types and the species found were examined by cluster analysis. The list of species is compared with those of other authors for lowland...
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