108 INSECUTOR INSCITI^ MENSTRUUS 



A pool was found by the river, filled by waste water coming 

 through the railroad track, which contained many pupae and 

 a few larvae of sansoni, vexans, and cinereus. 



(3) Drummond, 3,967 feet. Though practically of the 

 same altitude as Evaro (1), this place has the characteristics 

 of a river-valley locality. There is a broad flood-plain without 

 trees where the town is situated. A short walk brings one to 

 the river, which has many overflow pools and channels, for 

 the most part lined with low willow bushes. One day's collect- 

 ing was spent here, entirely in the river bottom. 



A'edes spencerii Theobald. Three females. 



Aides idaho'ensis Theobald. One male, 68 females. Of the 

 latter, 3 transitional toward aldrichi and one toward spencerii. 



A'edes vexans Meigen. One male and 50 females. 



A'edes sansoni Dyar & Knab. One male and 100 females. 



A'edes mimesis Dyar. Two males and 25 females. 



A'edes cinereus Meigen. Eighty-nine females. 



A'edes canadensis Theobald. Thirty-one females. 



A'edes curriei Coquillett. Eighteen females. 



A'edes sp. One female with black legs, too much rubbed for 

 determination. 



(4) Homestake, 6,356 feet. On the crest of the divide. 

 The mountain slopes to the west both steep and dry; but on 

 the east the descent is more gradual and there is opportunity 

 for breeding pools. Interesting species should occur. 



(5) Whitehall, 4,371 feet. Of the same general character 

 as Drummond (3). The flood-plain is well marked and tree- 

 less, the river bottom clothed with low willow bushes. Collec- 

 tions were made both on the prairie and river bottom. 



A'edes idaho'ensis Theobald. Ten males and 110 females. 

 Of the latter three intermediate toward aldrichi and six toward 

 spencerii. 



A'edes vexans Meigen. Four males and 83 females. 



A'edes sansoni Dyar & Knab. Nine females. 



A'edes mimesis Dyar. Four females. 



A'edes cinereus Meigen. Two females. 



A'edes curriei Coquillett. Forty-six females. 



A'edes nigromaculis Ludlow. Thirty-six females. 



