In the summer of 1884, while collecting the green tiger-beetles in the woods, it struck me very forcibly how the Cicindelæ that inhabit such places—sexguttata Fab. here, campestris Linn. in England, others elsewhere—are for the most part of a beautiful green, so as to assimilate in color with the surrounding vegetation and herbage among which they may alight; while those that frequent the bare ground, banks, sand hills, sandy stretches, beaches, bars—vulgaris Say, repanda Dej., maritima Dej., and many others—are of the colors easily assimilative with those that surround them on the flats and stretches where they are found.