244 Address of John L. LeConte. 
emerged from the bed of the sea, and was in the early and 
middle Tertiary converted into a series of fresh water lakes. As 
this insect does not occur in the territory extending from the 
Atlantic to beyond the western boundary of Missouri, nor in the 
interior of Oregon and California, I think that we should infer 
that it is an unchanged survivor of the species which lived on 
the shores of the Cretaceous ocean, when the intercontinental gulf 
was still open, and a passage existed, moreover, toward the 
southwest, which connected with the Pacific 
The example I have given you of the geographical distribu- 
tion of Cicindela hirticollis would be of small value were it an 
ork, and received by me from Kansas and Wisconsin; not, 
however, found west of the Rocky Mountains. This species, 
thus occurring in isolated and distant localities, is probably in 
progress of extinction, and may or may not be older than 
species of the genus by the I e wing covers, usually orna- 
mented with a dark spot. This i 
Atlantic coast from New York to Virginia, unchanged in the 
interior parts of the Mississippi Valley, represented at Atlantic 
City, New Jersey, by a large and quite distinct specific form, 
D. sellatus, and on the Pacific coast by two or three species of 
larger size and different shape, which, in my less experienced 
‘sete I was disposed to regard as a separate genus, Akep/orus. 
This form is, therefore, in a condition of evolution— how, I 
know not—our descendants may. The Atlantic species are 
