. Entomology : with special reference to its biological and economic aspects. ns, owingchiefly to the predominance of ants; Diptera follow with 30per cent, and then Coleoptera with 13 per cent. Alodern fam-ilies are represented in great profusion. The material fromFlorissant and neighboring localities includes a Lepisma, fif-teen species of Psocidse, over thirty species of Aphididae, andover one hundred species of Elateridse, while the Rhynchoph-ora number 193 species as against 150 species from the Tertiary of Europe. Tipu-lidse are abundant and ex-Cjuisitely preserved, whileBibionidae, as co
. Entomology : with special reference to its biological and economic aspects. ns, owingchiefly to the predominance of ants; Diptera follow with 30per cent, and then Coleoptera with 13 per cent. Alodern fam-ilies are represented in great profusion. The material fromFlorissant and neighboring localities includes a Lepisma, fif-teen species of Psocidse, over thirty species of Aphididae, andover one hundred species of Elateridse, while the Rhynchoph-ora number 193 species as against 150 species from the Tertiary of Europe. Tipu-lidse are abundant and ex-Cjuisitely preserved, whileBibionidae, as compared withtheir present numbers, aresurprisingly common. Nu-merous masses of eggs oc-cur, undoubtedly sialid andclosely like those of Cory-dalis. Sialid characters, in-deed, appear in the oldestfossils known, and arestrongly manifest through-out the fossil series, though among recent insects Sialid?s oc-cupy only a subordinate place. Strange to say, few aquaticinsects have been found in this ancient lake basin. Fossil butterflies are among the greatest rarities, only sev-. Prodryas pcrscphonc, a fossil butterflyfrom Colorado. Natural size. — AfterScudder. DISTRIBUTION 391 enteen being known; yet Florissant has contributed eight ofthese, a few of which are marvelously well preserved (), as appears from Scudders figures. Two of the Floris-sant specimens belong to Libytheinse, a group now scantilyrepresented, though widely distributed over the earth. Thegroup is structurally an archaic one, and its recent members(forming only one eight-hundredth of the described speciesof butterflies) are doubtless relicts. Taken as a wdiole, the insect facies of Tertiary times w^asapparently much the same as at present. The Florissant faunaand flora indicate, however, a former climate in Colorado aswarm as the present climate of Georgia. Quaternary.—The interglacial clays of Toronto, Ontario,have yielded fragments of the skeletons of beetles to the extentof several hundred specimens,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
