APPENDIX I 
443 
uted throughout the northern part of America, occurring through- 
out Canada, on the shores of Lake Superior, and on our high moun- 
tains, both the White Mountains and the 
Rockies. Several of them are found in the 
Arctic regions of Europe and Asia as well. It 
is not strange that forms of life sufficiently hardy 
and sturdy to live in these far northern coun- 
tries have been vigorous enough to spread over 
such a large territory. 
The insect represented in Figure 20 (Pelo- 
phila ulkei Horn), on the other hand, is, so far 
as known, peculiar to the Labrador country 
and the Hudson Bay region, though a closely 
allied form is found in Alaska. The Labrador 
species is about three-eighths of an inch long, 
and, though entirely black, is of peculiarly grace- 
ful form. It is quite flat, and slender and very 
shining, and has several distinct punctures and 
Fic. 20. 
Pelophila ulkef. 
tubercles upon the wing covers. Another beetle 
of the same genus (Pelophila rudis Lec.) is also found in Lab- 
rador, though it is very rare. It is about the same size as the 
former species, but the outer border of the wing cases is dark red. 
The mere difference of colour does not, of course, make it a different 
species, but these two beetles can easily be separated in this way, 
without recourse to more scientific distinctions. 
Several of the Labrador Carabide belong to the genera Ptero- 
stichus and Amara, and are proportionately more elongate and 
Fie. 21. 
Agabus arcticus. 
narrower than the two beetles illustrated. 
Most of these species are of blackish colours, 
but there is one kind (Amara similis Kirby) 
which is often metallic green or purple on the 
upper side of the body, with reddish legs. 
Amara similis is another one of the Labra- 
dor forms found in Mount Washington, and 
it has recently been found in the Green 
Mountains of Vermont. 
In a region where there are so many 
pools and ponds and so much water, we find 
that water-beetles are very common indeed. 
These belong mostly to the family Dytis- 
cid, and are, like the ground-beetles, car- 
nivorous, feeding on tadpoles, aquatic insects, 
and small fish. My desire to obtain two particular members of 
this family was what first interested me in Labrador insects. 
One of these beetles (Agabus arcticus Payk) is shown in Figure 21. 
