136 
PROCEEDINGS OF THE NATURAL [April, 1887. 
are, no doubt, speedily poured into the river and t lienee into the 
lake. Many too, unquestionably pass down the streams of the 
small ravines, which we mentioned as cutting the hilly walls 
along the shore. 
These two causes, the winds and the streams, will account for 
all the species known to occur within the county limits. But 
how are we to explain the appearance of the extralimital pine¬ 
boring Monohammi f There must be still another agency at 
work. This can be no other than lake currents, which sweep 
from the north and deposit such insects along the shore of our 
county. Some of these extralimital species must fly or creep 
up into the woods and fields on the bluffs of the shore. It is 
interesting to conjecture what effect they might have on our 
county insect-fauna. 
Let us now pass to the consideration of the natural distribu¬ 
tion of Coleoptera along our county beach. The words “natu¬ 
ral and accidental distribution ” are hardly correct, but they are 
the best terms I could find to designate these two groups of 
Phenomena. Those Coleoptera which were not wafted to the 
unfit in ^ ny ft PhySiCal ag6nCy ’ but which took up their abode 
and the d for the P ur Pose of feeding on edible refuse 
so nuniet ” ^ ^ ° f ° ther ^sects, which were often 
the naturaTditrfbuTon UCe nT c] 
of this distri hi f 18 c earl y evident that the beetles 
and feedpi-Q ™ i • Ut exce Ption rapacious species 
1 r ~ - w * 
tation as thp lw i a ^ to a s P°t as barren in vege- 
thus seen to be dependent indent ^ 
distribution TUn • S at measu re on the accidental 
more thriving the by the waves, the 
mg species and their larva*. l Jl edaceous and carnon-eat- 
Though less wonderful than 
distribution offers many remarkabl aC f ° ldental distribution ’ thlS 
with numerous beetles found no JlT ' 11 ^ P" 8 ®”* 
Such are, for example Tibth ■ ^ h ®re else in the county. 
Camonia pemylvanica. Callida ZrZr Loricera ™™ k * cens ’ 
F 1 ea > 1 mar a avida and many 
