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Before proceeding to describe the imago of Anopheles , we wish to record some observations regarding the hibernation of the larvae of various Culicidae. Grassi (1900, p. 47) 1 considered that A. bifurcatus hibernated chiefly in the larval form, for he found the larvae of this species in midwinter in Southern and Central Italy, the imagines being rarely encountered. It was quite different with A. maculipennis . In this case the imagines congregated in houses, huts, caverns, etc., whereas no larvae could be found during the winter. Though he assumed that it was so, his finding the larvae in midwinter in the first instance did not prove that they hibernated, for they might well have been derived from late-laid eggs.
Nuttall et al. (Tue,) studied this question.