1912.] NATURAL SCIENCES OF PHILADELPHIA. 235 ON THE ORTHOPTERA FOUND ON THE FLORIDA KEYS AND IN EXTREME SOUTHERN FLORIDA. I. BY JAMES A. G. REHN AND MORGAN HEBARD. It has been the desire of the authors for some time to determine what species of Orthoptera were to be found throughout the winter in the subtropical area of southern Florida. With this end in view, the junior author visited the region in the latter part of March, 1910, as it seemed evident that this would be the time when species would have entirely disappeared, should they succumb to the colder weather in this region, while spring forms would, as a rule, not have reached maturity. The facts obtained would indicate that a considerable proportion of the species of this region are in evidence throughout the winter, though probably in considerably reduced numbers. The amount of this reduction cannot be stated at present, as insuf-ficient work has been done in this region during the summer. The families Mantidae and Tettigoniidse, however, alone seem to be severely affected by the cold, and the few specimens taken which belonged to these families were either most battered remnants of the past summer or the first freshly emerged individuals of the spring brood. Nymphs of a number of interesting species were far more abundant than adults of the same, while nymphs of several species plainly unknown to the United States were taken, unfor-tunately in such an early stage of development as to make determina-tion impossible. It is the intention of the authors to do considerable work in southern Florida during the summer of the present year, and not only is it hoped that adults of these very interesting species may be secured, but also that the publication of the results, when compared with those given in the present paper, will indicate the difference between the abundance of forms in the summer and winter throughout the region. The following table will indicate the comparative abundance of forms as found just before the appearance of the spring forms. Number Very Small of abun-Abun-num-Very Nymphs Family. species, dant. dant. bers. Rare. rare. only. Forficulidae 5 13 1 Blattidae 9 12 13 2 Mantidae 2 2 Phasmidae 3 1 11 Acrididae 23 1 11 6 1 1 3 Tettigoniidse. 5 — 113 — Gryllidae 18 2 4 5 1 5 1
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