A Contribution to the Study of the Ecology of Corixidae (Hemipt.)

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Abstract
117 miscellaneous collections of corixids are analyzed into groups according to predominant sp. and features common to each group. Following arrangement emerges: Group 1. Corixa lacustris, C. falleni and sometimes C. concinna: rivers, ditches, lakes and a pond. All the group I spp. occur frequently. Group II. C. sahlbergi; stagnant, usually small places with much decomposing vegetable matter. Group III. C. praeusta; rivers, large ponds, and small lakes that are highly productive, somewhat polluted or enriched by dead leaves. Group IV. C. scotti, C. castanea, C. semistriate, C. venusta, C. germari, C. wollastoni, C. nigrolineata; mountain, moorland, heath, bog, or in one instance fen pools, ponds and streams. Group V. Corixa nigrolineata, C. punctata, C. lateralis; productive ponds. Coefficients of association between spp. from 400 places are calculated by Cole''s method. Spp. can be arranged, according to their associates, in 3 groups: pools and ponds on base-poor soil (group IV), productive ponds (Groups II and V), and lakes and rivers (groups I and III).

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