374 PROCEEDINGS OF THE ACADEMY OF [Sept., 



land, Colorado Springs, Colorado, Aug. 18, 1 d", 1 ? . Akron, Color- 

 ado, Aug. 24, 1 c^. 



This series presents the variation in the intensity of the overlying 

 blotches of dark brown usual in the species, and which in specimens of 

 a light base color produces a strongly maculate type. The specimens 

 from Upper Geyser Basin all have the sutural margin of the tegmina 

 distinctly and broadly marked with pinkish ochraceous. 



In the Upper Geyser Basin this species was to be found in small 

 numbers in the small grassy spots between the geyser formations and 

 the Firehole river. In the other localities the species was scarce. 

 Its flight is very vigorous and accompanied by a loud clattering. 



Arphia arcta Scudder. 



Hill at head of Mammoth Hot Springs, Yellowstone Park, Aug. 5, 

 1 o^. 



This specimen has the wings orange red. 



The individual collected was the only representative of the species 

 seen. 



CHORTOPHAGA Saussure. 

 Chortophaga viridifasciata (De Geer). 

 St. Louis, Missouri, Aug. 27, 1 $ . 



ENCOPTOLOPHUS Scudder. 

 Encoptolophus coloradensis Bruner. 



Knob Hill, Colorado Springs, Colorado, Aug. 17, 1 d^. 



The recognition of this distinct species was quite a surprise. Its 

 closest ally is E. sordidus, from which it is separated by numerous 



Fig. 8.— Encoptolophus coloradensis Bruner. Knob Hill, Colorado Springs, 

 Colorado. Lateral view of male. (X 3:) 



characters. The only published record is the original description, 

 the type being from Fort Collins, Colorado. 



