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FOSSIL INSECTS FROM THE ROCKY MOUNTAINS. 667 
and include five of the species, while the remaining sixth comprises 
about half the species and belongs to various groups. Of the 
Coleoptera, fully one-half the species and about seven-tenths of 
the specimens belong to the Curculionide; the others mostly to 
the Staphylinide and Carabide. These twosuborders, flies and bee- 
tles, comprise the bulk of the determinable objects—nearly six- 
sevenths of the specimens and more than five-eighths of the species. 
The Hymenoptera consist of a small ant, a Pteromalus-like insect, 
and one rather obscure form. The Hemiptera are represented by 
an insect resembling Issus and another apparently belonging to 
the Tingide. In the Orthoptera there are only legs of a Locusta- 
rian about as large as our common Phylloptera and a cricket, 
perhaps of the genus Nemobius. Two Phryganeids are represented 
by wings, one of them doubtfully located in this family. Of the 
gally worm and spiders little can be said. 
The interest in these objects is greatly increased when they are 
compared with the others brought from the same region. In the 
first place, the shales from “ Chagrin valley ” and ‘‘ Fossil Cañon,” 
are dark gray in tint, while those containing the insects now 
under discussion are of a reddish clay-color ; the former are much 
more closely grained and of a firmer texture, resembling litho- 
graphic stone, and the objects are consequently better preserved — 
indeed on some slabs the hairs along the edge of a wing in a 
Thrips may be counted. 
Again, the faunæ of the several localities differ. We have already 
remarked in a previous paper that this is the case with the speci- 
mens from Chagrin Valley and Fossil Cañon, although the stones 
themselves are similar in character. Mycetophilide and other 
Diptera are found in both places, ‘‘ but in Fossil Canon, the yari- 
ety and abundance are proportionately greater ; the ants, the moths, 
the Thrips and nearly all the smaller Coleoptera are restricted 
to Fossil Cañon, while the larvæ come from Chagrin Valley.” 
— The same is true of Mr. Richardson’s specimens; not a single 
‘Species can be definitely referred to any of those found by Prof. 
i Denton, and the assemblage of species is different: thus, a single 
fragment of an elytron is the only Curculionid in the Chagrin 
Valley Shales, and probably it is generically distinct from all those 
Mentioned above. The type of fly spoken of as so abundant in 
* ‘Shales collected by Mr. Richardson is represented in the 
_ Previous collection only by a single specimen from Fossil Cañon, 
