1892.] 
377 
[Scudder. 
different points, but only in one spot have they been obtained 
in any remarkable number, here however in extreme abun- 
dance ; as this spot was five miles distant from our camp and 
our time and supplies were limited, no great number of specimens 
were brought away, but enough was seen to warrant the belief 
that a prodigious number of specimens might be obtained there. 
The detailed study of the fossil Rhynchophora has made very 
clear and specific one point which impressed me in general while 
working in the field, and that is the wide difference between the 
character of the fossils obtained at Florissant and those obtained 
at any of the other localities (perhaps excepting Elko, Nevada, 
of which little is known) in the Rocky Mountain region. The 
Hymenoptera which abound at Florissant almost disappear in the 
other localities, while the Coleoptera, which hold a third place at 
Florissant, form the larger proportion of the mass in the other 
deposits. To test the opinion formed by the cursory examina- 
tion of specimens in the field, I have counted the specimens ob- 
tained in each of the different localities visited during a single 
summer, and find the opinion amply confirmed. 
Relative Abundance of some of the Orders of Insects in 
Different Western Deposits. 
Number of Specimens. 
Percentages. 
Orders. 
All 
Localities 
Floris- 
sant. 
Other 
Localities 
All 
Localities 
Floris- 
sant. 
Other 
Localities 
Hymenoptera 
277 
243 
34 
15.2 
34.5 
3.0 
Diptera 
432 
184 
248 
23.7 
26.1 
22.2 
Coleoptera 
806 
104 
702 
44.3 
14.8 
63.0 
Hemiptera 
185 
86 
99 
10.0 
12.2 
8.9 
Orthoptera 
19 
2 
17 
1.0 
0.3 
1.5 
Neuroptera 
90 
75 
15 
5.0 
10.6 
1.3 
Arachnida 
11 
11 
0 | 
0.6 
1.5 
0.0 
Totals 
1820 
705 
1115 
99.8 
100.0 
99.9 
The first set of columns in the above table shows the total 
number of specimens (regardless of species) obtained during 
this season’s work, separated by orders, (1) in all localities ; 
(2) at Florissant alone ; and (3) in the other localities, excluding 
Florissant ; and the second set of columns the same figures re- 
duced to percentages. Nothing could well be more striking than 
the contrasts in the Hymenoptera and Coleoptera. 
