. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. Evohdion and Taxonomy 55 Fig. 5. -Xenoneura anti- quorum. its Structure. And the insect described by Moberg {Protoci- mex siluriciis) is supposed by him to be hemipterous, an even more highly specialized type. Of devonian insects we know several. Those which are best preserved are Homothehis fossilis (Fig. 4), Xen
. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. Evohdion and Taxonomy 55 Fig. 5. -Xenoneura anti- quorum. its Structure. And the insect described by Moberg {Protoci- mex siluriciis) is supposed by him to be hemipterous, an even more highly specialized type. Of devonian insects we know several. Those which are best preserved are Homothehis fossilis (Fig. 4), Xenoneura anti- q2iorum{V\g. 5), ?,\\A Platephemera antiqua (Fig. 6). These differ among themselves to such an ex- tent that we are forced to conclude without taking into account the two known silurian insects, that already at that early time there was a large and varied insect fauna, of which the more primitive forms have not been discovered. From the carboniferous rocks much more abundant material has been obtained. But, according to the views of Mr. Scudder "there existed among these ancient forms no ordinal distinc- tions, such as obtain to-day, but they formed a single homo- geneous group of generalized hexapods, which should be separated from later types more by the lack of those special characteristics which are the property of existing orders than by any definite peculiarity of its ; * To this group of generalized hexapods which includes all pa- leozoic insects the name Paltzo- dictyoptera has been applied. Among the Palseodictyoptera were insects which were un- doubtedly the precursors of the cockroaches, the may-flies, and the walking-sticks. Still these groups of insects '' were more closely related to one another, at least in the structure of their wings (which is the onl}- point of general structure yet open for ) than any one of them is to that modern group to which it is most ; The ordinal distinctions which is now found in the &
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