INSECUTOR INSCITI^ MENSTRUUS 85 



Aedes communis lazarensis Felt & Young. 



The most common species of the black-legged group. East 

 of the divide many normally colored but small examples oc- 

 curred, but in the forests to the west, the mesonotum was often 

 dark brown or gray and variably ornamented. Great confusion 

 also was caused by the numerous hybrids, as previously noted. 



Aedes pionips Dyar. 



No adults were taken, as we left the park early in July 

 before the species was on the wing. Two large breeding pools, 

 however, were found, one at the outlet of Lake McDonald, 

 the other in the trail along the margin of Two Medicine Lake. 

 The former culture was successful and many adults emerged ; 

 but the latter was almost totally destroyed by great numbers of 

 Eucorthera underivoodi larvae, whose pupae occurred more 

 abundantly in this puddle than I ever saw them before. 



Aedes cataphylla Dyar (prodotes Dyar). 



Frequenting open spaces near forest, and consequently rare 

 to the west of the divide ; rather common along the eastern base 

 of the mountains, but not extending into the prairie. The species 

 had been long on the wing by the first of July, and many ex- 

 amples were worn. Hybrids between this and lazarensis are 

 indicated by the coloration of certain females ; but it may be 

 that these are aberrant forms of impiger, as no males were 

 obtained of the apparently crossed forms. 



Aedes impiger Walker {decticus H., D. & K.). 



This occurred very rarely, but throughout the forest. 



Aedes diantaeus Howard, Dyar & Knab. 



Occurring in the most shaded and cool parts of the forest, 

 absent elsewhere. A lovely place was found about two miles 

 from the town of Whitefish where this species was, and again 

 in low land where McDonald Creek empties into the Flathead 

 River, this latter place having been kindly described to us by 

 Mr. Eakin, who sent a boy to show the way. Mrs. Dyar, who 

 was with me, saw a pair of mosquitoes in copulation on my coat- 



