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Orthoptera now contains - Species, 542, specimens 442, divided as follows:- Family Species Specimens. Forficulidae 17 66 Mantidae 12 105 Phasmidae 3 32 Blatidae 25 165 Tettigidae 30 190 Acrididae 337 3280 Lecustidae 85 464 Gryllidae 33 140 Total 542 4442 These numbers in regard to species may not prove exact, as so many are still either unnamed or entirely undescribed, that until they are carefully worked over the specific or other rank of some forms can not be definitely determined. There are also 27 double boxes containing several thousands of duplicates for exchange. In the Parasitic Hymenoptera the Microgasters have all been rearranged so as to include all the new and many undescribed species, which I hope soon to find time to define; while in the Biological series, much of 19