INSECUTOR inscitivt; menstruus 109 



(6) Bozeman, 4,773 feet. This is situated toward the head 

 of a valley. The prairie is undulating, while the river is small. 

 A considerable area of valley is covered with dense bushes of 

 Crataegus and dwarf poplar. 



A'cdes idahocnsis Theobald. Twenty males and 59 females, 

 the latter all typical. 



A'edes vexans Meigen. One female. 



A'cdes sansoni Dyar & Knab. One hundred and eighty 

 females. 



A'cdes iniuiesis Dyar. Four females. 



A'cdes cinereus Meigen. Four females. 



A'edes canadensis Theobald. Ten females. 



A'edes nigromaculis Ludlow. One female, small and lightly 

 colored. 



(7) Big Timber, 4,094 feet. The town is on the edge of 

 the prairie, whence one descends a rather steep hill to the 

 river bottom. This latter is wide, with many dead channels 

 and marshes, covered with willow bushes and groups of tall 

 cottonwoods. From the latter the place gets its name. Col- 

 lecting was done both on the prairie and in the river bottom. 



A'cdes idaho'cnsis Theobald. Ninety-eight females, of which 

 6 intergrade toward aldrichi. 



A'cdes aldrichi Dyar & Knab. Twelve males and 184 

 females. 



A'edes vexans Meigen. Seventy- four females. 



A'edes sansoni Dyar & Knab. Three females. 



A'edes cinereus Meigen. Three females. 



A'edes curriei Coquillett. Eight females. 



A'edes nigromaculis Ludlow. Thirty-one females. 



(8) Laurel, 3,311 feet. Farther down the Yellowstone 

 Valley than Big Timber, the conditions intensified. The 

 prairie is wide, the town situated a mile and a half from the 

 river, while it is an equal distance to the sparsely pine-clad 

 bluffs that border the valley. Irrigation is much resorted to. 

 The river is large, with steep bank on one side, but low on 

 the other, the bed enclosing low islands and forming marshes 

 and dead channels. Collecting was done on both prairie and 

 river bottom. 



