gS 
Analyses of iBooks. 
[February, 
Bulletin of the United States Geological and Geographical Survey 
of the Territories , Vol. VI., No. 2. Washington: Govern- 
ment Printing-Office. 
This issue opens with an Annotated List of the Birds of Nevada, 
by Dr. W. J. Hoffmann, with remarks on the distribution and 
vegetation as affedting the Avi-fauna. It is only natural that the 
fauna, both of birds and insedts, should depend more on the 
character of the flora than on absolute height above the sea- 
level. In Nevada the common humming-bird ( Trochilus colubris ) 
occurs at an elevation of 9700 feet. 
Next follows a List of North- American Moths, with a prelimi- 
nary Catalogue of the Genera Hadena and Polia t by A. R. 
Grote. 
Mr. J. H. Scudder has drawn up an account of the Tertiary 
Lake-Basin at Florissant, Colorado, one of the richest localities 
in the world for fossil plants and insedts. Mention is made of a 
grove of petrified trees, probably Sequoias, which were formerly 
from 5 to 6 yards in height, but have been gradually destroyed 
by tourists. At the southern lake a sedtion of about 7 yards was 
cut showing thirty distindt layers of shales, many of them 
fossiliferous. This locality has in a single season yielded more 
than double the number of specimens which Prof. Heer obtained 
from the CEningen beds in thirty years. The different orders of 
insedts are by no means represented in the same proportions. 
At CEningen the Diptera form only 7 per cent, whilst at Floris- 
sant they rise to 30 ; the Hymenoptera are only 14 per cent in 
the former, and 40 in the latter. The Coleoptera are 48 per cent 
at CEningen, and only 13 per cent at Florissant. Among all the 
Florissant insedts ants are the most numerous — mostly Formi- 
cidae, a few Myrmicidae, and some Poneridae, but no Mutillidae. 
Thirty species of Vespidas have been detedled ; one, a Polistes, 
shows traces of a blue-green metallic colour. Only five butter- 
flies have been found, generically distindt from any living forms, 
and there are perhaps eight species of nodturnal Lepidoptera. 
Among the numerous Diptera, Culicidae, Chironomidae, and Tipu- 
lidae are abundant. Bibionidas are the prevailing type. There 
are about fifty Asilidas, some of them of great size. Of the 
Coleoptera two-fifths belong to the Curculionidas. There are 
about thirty species of Carabs ; no large Dytisci ; thirty Lamel- 
licornes ; about as many Buprestidas, some of which are very 
perfedt. There are about forty species of Elateridas, often in 
beautiful condition. There are some fifteen species of Longi- 
cornes ; perhaps two dozen Chrysomelidae, and 120 Curculio- 
nidae. Hemiptera present a great variety of forms, but water- 
bugs, like water-beetles, are uncommon. There are about eight 
species of plant-lice. The spiders are uninteresting, and have 
few features in common with those found in the Prussian amber. 
