. Annual report. 1st-12th, 1867-1878. Geology. SCUDDEE.] TEKTIARY LAKE BASIN OF FLORISSANT. 279 taken place during or after miocene times, but there are no physical data yet at hand to warrant definite conclusions on this head. PALEONTOLOGY. The insects preserved in the Florissant basin are wonderfully numer- ous, this single locality having yielded in a single summer more than double the number of specimens which the famous localities atOeningen, in Bavaria, furnished Heer in thirty years. Having visited both places I can testily to the greater prolificness of the Florissant beds. As a rule,
. Annual report. 1st-12th, 1867-1878. Geology. SCUDDEE.] TEKTIARY LAKE BASIN OF FLORISSANT. 279 taken place during or after miocene times, but there are no physical data yet at hand to warrant definite conclusions on this head. PALEONTOLOGY. The insects preserved in the Florissant basin are wonderfully numer- ous, this single locality having yielded in a single summer more than double the number of specimens which the famous localities atOeningen, in Bavaria, furnished Heer in thirty years. Having visited both places I can testily to the greater prolificness of the Florissant beds. As a rule, the Oeningen specimens are better preserved, but in the same amount of shale we still find at Florissant a much larger number of sat- isfactory specimens than at Oeningen, and .the quarries are fifty times as extensive and far more easily worked. The examination of the immense series of specimens found at Floris- sant* has not gone far enough to yield data sufficiently definite for gen- eralization of any value, or which might not be altered or even reversed on further study. It may, nevertheless, be interesting to give a running notice of what has been observed in assorting the collection, and to make the single comparison with the Oeningen insect fauna which the number of individuals will furnish. This is indicated by the following table, based on a rough count of the Florissant specimens, but which cannot be far astray: Percentage of representation by- Hymenoptera Diptera Coleoptera Hemiptera Arachnkla ... Lepidoptera . It will be seen that the proportion of specimens of each order is very different in all that are well represented, with the sole exception of the Hemiptera, while the same groups (Orthoptera, Arachnida, Myriapoda, and Lepidoptera) are feebly represented in both. The greatest differ- ence occurs in the Diptera, which are less than 7 per cent, of the whole at Oeningen and about 30 per cent, at Florissant; in the Hymenopte
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