Abstract
At Westbank, British Columbia, nests ofFormica subnitens Creighton were covered with detritus domes and were found only in unshaded areas. The foraging area of a colony averaged approximately 2.500 square feet and had one or more ant trails. Reproduction of sexuals commenced in April and the adults emerged about mid June. Sexual flights occurred between 8 and 10 a.m. Worker castes were produced from June to August. Worker ants foraged between soil surface temperatures of 51° and 125° F. from April to October. The ant lived largely on other insects and aphid secretions, the latter being taken in small quantities in the spring but making up over 50 per cent of the food by mid summer. F. subnitens apparently did not prey onChrysolina gemellata (Rossi), a chrysomelid imported in an attempt to control common St. John's-wort,Hypericum perforatum L.
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