1906.] NATURAL SCIENCES OF PHILADELPHIA. 407 



The form of the cerci of the male individuals here placed under this 

 species agree fairly well with Scudder's figure of those parts, and not- 

 withstanding his remarks to the contrary the authors believe inter- 

 medius is at the most not more than a form of atlanis, and probably not 

 even worthy of a name, varietal or otherwise. Numbers of specimens 

 have been examined which seem to connect atlanis and intermedius, 

 and all such are here treated under atlanis; only those closely approxi- 

 mating Scudder's figure being referred provisionally to intermedius. 



Considerable variation in size is noticed, males ranging from 18 to 24 

 millimeters in the length of body. One male has the caudal tibiae 

 pale reddish, all the others varying shades of glaucous. 



One of the typical sage-brush species. In some localities it was 

 quite plentiful. 

 Melanoplus atlanis (Riley). 



Livingston, Park Co., Montana, Aug. 4, 3 c^, 4 9 . Electric, Park 

 Co., Montana, Aug. 4, 1 d^. Jefferson Valley, Montana, Aug. 5, 1 9 . 

 Three Forks, Gallatin Co., Montana, Aug. 12, 1 cJ*. ]\Iammoth Hot 

 Springs, Yellowstone Park, up to 7,050 feet, Aug. 5, 2 c?, 2 $ . Foun- 

 tain, Lower Geyser Basin, Yellowstone Park, Aug. 6,19. Pine woods, 

 Old Faithful, Upper Geyser Basin, Yellowstone Park, Aug. 7, 4 cJ*, 1 9 . 

 Salt Lake City, Utah, Aug. 13, 14 c?, 12 9 . Hillside, 4,700 feet. Salt 

 Lake City, Utah, Aug. 14, 5 d" 1, 9 . Top of Ensign Peak, 4,900 feet, 

 Salt Lake City, Aug. 13, 3 cJ^ . Five miles south of Salt Lake City, in 

 alfalfa field, Aug. 13, 2 c^, 3 9 . Grand Junction, Mesa Co., Colorado, 

 Aug. 15, 1 cJ^, 2 9 . Newcastle, Garfield Co., Colorado, Aug. 16, 1 6". 

 Knob Hill, Colorado Springs, Colorado, Aug. 17 to 22, 7 d^, 2 9 . 

 Prairie land, Colorado Springs, Aug. 18, 3 d^, 2 9 . Manitou, Colorado 

 Aug. 23, 9 d", 1 9 ; same locality at 6,700 feet, Aug. 16, 4 d", 1 9 .' 

 Garden of the Gods, Colorado, Aug. 17, 5 d^, 7 9. Dark Caiion, 

 Pike's Peak, 8,920 feet, Aug. 16, 2 9 . Roggen, Colorado, Aug. 24, 2 9 . 



This series exhibits a very great amount of variation in size and 

 coloration, and in the form of the cerci many of the males placed here 

 approach intermedius, as mentioned in the remarks under that form. 

 The dullest specimens with little contrasted coloration are from the 

 Garden of the Gods, and the palest ones are from the vicinity of Salt 

 Lake City. However, while the majority of specimens of each series 

 from the two above localities are uniformly dark or light, a few speci- 

 mens from each locality are of what might be called the average type. 

 Quite a number of specimens have the caudal tibite of various shades of 

 glaucous. 



A common species in both sage-brush and prairie-grass. 



