SCUDDER. ] TERTIARY LAKE BASIN OF FLORISSANT. 281 
generally very perfect. Tipulidae are abundant and admirably pre- 
served ; of the larger forms alone there appear to be several hundred 
specimens, and apparently a considerable number of species. The 
smaller Tipulidae, including the Limnobina, are also abundant and well 
preserved. Some beautiful Mycetophilidae have been noticed, but these 
have not yet been selected from the mass of smaller flies. Bibionidae 
are the prevailing type among the Diptera; there must be 1,000 speci- 
mens belonging to this family, and on a cursory view there appears to be 
no great variety; probably both here and in the ants, as insome genera of 
plants, it will appear that there are vast numbers of a single species; a 
great many specimens are represented by bodies ouly, or these accom- 
panied by insignificant fragments of wings; but even putting all these 
aside, there remain a goodly number with tolerably perfect wings, and 
some in which almost every part of the body is preserved; taken asa 
whole, however, they are perhaps less perfect than specimens of almost 
any other family. There are a dozenor more Stratiomyidae, of two or 
three species; and several species of Midasidae or Hermoneuridae, one 
admirable specimen of the latter family having been described as be- 
longing to a new genus under the name of Palembolus florigerus. There 
are nearly half a bundred Asilidae and Therevidae, many of them ex- 
quisitely preserved, some of great size, and among them a fair variety 
of forms. Bombylidae are somewhat less abundant, but show some 
Superb specimens of great size and in wonderful preservation; there 
are certainly six or eight species. Syrphidae are more abundant than 
the last, nearly 50 specimens haying been found, in which the patterns 
of the abdominal colors are generally well marked, and among which 
we find a considerable variety. There is a vast host of Muscidae and 
allied groups, of which no account has yet been taken, and with which, 
no doubt, many other forms are still commingled; but three or four 
species of very pretty Ortalidae may ue mentioned, with ten or a dozen 
specimens. 
About three-fifths of the Coleaniens belong to the normal series and 
two-fifths to the Rhyncophorous division. There are 80 to 90 specimens 
of Carabidae, including, perhaps, 30 species; many of them are very fine 
and perfect, especially in the sculpturing of the elytra. Water-beetles 
are not so numerous as would be anticipated; there are not more than 
60 or 70 specimens, with perhaps twenty species; there are no large 
Dytisci, such as occur abundantly at-Oeningen; the largest of our spe- 
cies, perhaps an Hydrophilus, not exceeding 12™™ in length. The 
Staphylinidae are rather more numerous than the ground-beetles, with 
nearly 30 species, some of them tolerably large. There are half a dozen 
species of Nitidulidae. Some 60 or more Scarabaeidae show considerable 
variety, there being nearly 30 species among them. Nearly as many 
Buprestidae have quite as great a variety of form ; a considerable number 
of them are large and nearly all fairly preserved, some remarkably per- 
fect; one species, Chrysobothris Haydeni, has been described. Elateridae 
are more abundant, numbering more than 100 specimens, many of them 
in beautiful condition; they are abundantin species, over 40 having been 
separated, and are mostly of a medium, none of a large size. Consider- 
ably over 100 specimens are to be referred to the Meloidae, Mordellidae, 
and Malacodermata, but the specimens do not appear to be very well 
preserved, although about 40 species may be distinguished. The Ceram- 
bycidae are very beautiful, furnishing 30or more specimens, representing 
more than half as many species; one fine species of anew extinct genus, 
Parolamia rudis, has already been described, and there are others equally 
fine. There are a dozen or more species of Bruchidae, one of which, 
