Abstract
The Author, after having observed that groups of related species ofTetrastichus sensu lato presents a particular specialization in the research of host, offers new and known evidences on those which are parasitic uponChrysomelidae eggs. The A. explains variations of morphological characters, considered specifically discriminating, which have been observed in some of them and he gives a key of theTetrastichus having these uses or which it is suspected they have. In this key some species which were practically bare names are redescribed.
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