INJURIOUS INSECTS OF I9Q0Q AND IQIO. 1 UIE LE 
The season of 1910, in Minnesota, was the dryest in the history of the 
white man. In Itasca Park where, in former years, the mosquitoes had been 
unbearable, in 1910 no mosquitoes were present, even in the usually swampy 
regions of the Park. I give this to show how dry it was. Now, whether 
because of this excessive dryness or not, the larch saw-fly larvae did not 
remain on the tamaracks as long as they had in previous years, leaving while 
the trees still showed green. Also, the cocoons were considerably smaller 
than they had been in previous years. It seems, then, that the tamaracks 
here will have a little respite next year from the gross attacks of these pests. 
The other regions of infestation, according to reports received, did not mani- 
fest any such peculiarity. 
Mieeols 9 wary a 1Out 
Larch Saw Fly. Rug- 
gles. 
Fig. 62. Pupa_of 
Larch Saw Fly. 
Rugegles. 
Fig. 63. Cocoon 
of Larch Saw 
Fly. Ruggles. 
Fig. 64. Adult Male Saw Fly. .Original. 
The larva of this sawfly is, when full grown, a pale green worm, 
a little more than a half inch in length, and feeds upon the needles 
of the tamarack. The fly, or perfect insect, is half an inch long, 
with blackish body, marked by a band of red across the middle of 
the abdomen. It has four wings. This is the insect so well known 
for several years in the forests of the Middle West and New Eng- 
land. It is parasitized to some extent, and it is possible that we 
