666 FOSSIL INSECTS FROM THE ROCKY MOUNTAINS. 
Denton were found in Colorado (as stated) or Wyoming Territory. 
Those now under consideration purport to come from the latter 
district,* as stated in the subjoined letter to the editors, though 
far removed from the vicinity of Chagrin Valley or Fossil Cañon, 
the two localities explored by Professor Denton. About one 
hundred slabs, mostly of very small size, were brought away; 
these contain at least one hundred and seventy-five specimens, 
including in that number all the reverses. Of these specimens 
thirty-five cannot be referred with certainty to any subordinal 
group, since they consist merely of abdominal segments or blurred 
and distorted fragments, the affinities of which can only be rudely 
surmised. The remainder are referable to nearly forty species, 
belonging to the following groups, mainly arranged in the order 
of numerical] superiority : 
Diptera, thirteen species, sixty-six specimens 
Coleoptera, twelve hae fifty-two 
ymenoptera, three c five s 
Hemiptera, ‘ four 
Orthoptera u four s 
Neuroptera, tw: i tw i 
Ea three $i six of i 
Myriapoda, one “ one he i 
Of the Diptera, one-half the specimens belong to a single or 
possibly two heavy-bodied species of small size, which, although 
invariably wingless, are presumed to be so only by mutilation, 
since exceedingly few wings are preserved on any of the stones; 
of the other half, two-thirds are Tipulidæ or Mycetophilide 
ae 
4 
+“ T discovered and collected the fossil insects on the Green River in Wyoming 
tory on the line of the Union Pacific Rail aa about forty mi 
Salt Lake Ci Or, to be more precise, the locality is five pai w cal 
City a on the railroad track. — _— and longitude as near as sTcanm 109° 50! 
from very imy lows, Latitude 41° w north, Longitudea g 
west. Ihadash f i 
no stra spot where any number could * onained: Iwas se with piece o 
explorer, Mater Powell, and left the fossils with him. I returned a stratum 
account of poor health), ad, while looking for fossil vee and hee ri ‘rom 
some two or three inches thick exposed in a railroad e o the 
Y 
the appe rance. spo fossil sop geme leaves and frot turalists and 
Tam ore indebted.”—F. C. A. pac Pres. Chicogo # 
Aug. 5, 1872. 
