Judging by the first volume of this work, which I have lately received, it will prove of great value to American students of this difficult family. The first volume is illustrated by a number of finely colored plates, and Mr. Lichtenstein promises in his preface to use all such funds as he may obtain from subscribers to the work, in illustrating the second volume—thus practically making subscribers a present of the text. While the monograph will deal more particularly with European species, many notes will be given comparing nearly allied American with European forms.