INSECUTOR INSCITI.^ MENSTRUUS 87 



Aedes excrucians Walker. 



Not common, but generally distributed in the forest proper 

 to the Canadian zone. A male was demonstrated from White- 

 fish and another from the foot of the Mt. Henry trail, not far 

 from the Glacier Park Hotel east of the divide. 



Aedes fitchii Felt & Young. 



Very common in the forest. Vast swarms of the males were 

 seen at Belton after sunset on a hillside between openings in 

 the trees. We caught them with a net till we were tired of the 

 sport. The species seems also to occur commonly east of the 

 divide, or perhaps the form mimesis, but no males were taken. 



Aedes increpitus mutatus Dyar. 



Very abundant in the river valleys to the east of the divide. 

 We observed great swarms of the males. The swarming began 

 before sunset. One evening, following a road back from the 

 Glacier Park Hotel, we came to a place where the road dipped 

 into a creek-bottom lined with willows. The males were flying 

 close to the ground in hollows, banks and near bushes, just out 

 of reach of the last rays of the setting sun. Later the swarms 

 were seen higher up among the willows in the river-bottom. 



Aedes nigromaculis Ludlow. 



This species belongs to the prairie fauna. A single stray 

 example was taken at Belton. 



Aedes canadensis Theobald. 



Scarce, but throughout the lower forest to the west of the 

 divide. 



Aedes vexans Meigen. 



A few examples, more common at Whitefish than in the deep 

 forest. 



Culiseta impatiens Walker. 



Two females were taken in forest in the valley of Two 

 Medicine River to the east of the divide. Probably sparingly 

 distributed throughout the forest. 



