1906.] NATURAL SCIENCES OP PHILADELPHIA. 397 



approaching them close enough to strike with the net. They may be 

 heard high in the air making for several minutes at a time a noise like 

 the whirring of machinery. The sound is continuous while the insects 

 rise and fall in a most peculiar erratic flight. I have seen specimens of 

 this species fly for over a quarter of a mile making continually this 

 peculiar sound. Of all the Orthoptera met with this was without 

 doubt the most vigorous and elusive species. 

 Circotettix suffusus (Scudder). 



Summit of foothill of Gallatin Range, ^Mammoth Hot Springs, Yellow- 

 stone Park, Aug. 5, 1 9 . Hill at head of springs, ^Mammoth Hot 

 Springs, Aug. 5, 1 cJ'. Upper Geyser Basin, Yellowstone Park, Aug. 

 5, 6 6^,2 9, 1 nymph. 



These specimens are rather uniform in color for representatives of 

 this genus, one being more clear grayish than the others, and several 

 with a faint suggestion of ferruginous in their general tone. 



About the Hot Springs this species was found in the open sage- 

 brush of the hillsides, while at the Upper Geyser basin it was found in 

 the small grassy openings in the dense pine woods. 

 Circotettix verruculatus (Kirby).=f 



Muir, Bozeman Tunnel, Gallatin-Park Co., Montana, Aug. 12, 1 &, 

 1 9. 



These specimens do not differ in size, the female, however, being 

 slightly more robust. The frontal costa in the male is quite broad and 

 similar to the female, thus differing from a large number of Eastern 

 specimens examined. A series of thirty-one specimens, covering 

 localities extending from the mountain regions of Pennsylvania and 

 Maine west to the northern peninsula of Michigan (Pequaming), shows 

 that while considerable variation in color and size is present in a series, 

 it cannot well be correlated with locality. The two Montana specimens 

 are among the largest seen. 



These two specimens were taken on a cinder pile beside the railroad. 

 Their crackling was very noticeable whenever they took flight. 



HADROTETTIX Scudder. 

 Hadrotettix trifasoiatus (Say). 



Sappington, Gallatin Co., Montana, Aug. 12, 1 d^ . Colorado Springs, 



^° The type of this species was taken in "Latitude 57° N., " and in all probabihty 

 was collected by Drummond, who traversed the Athabasca and Peace river 

 region in tliis latitude in western Athabasca and northeastern British Columbia. 

 If collected by Richardson, the other naturalist of the Franklin expedition, it 

 was no doubt taken either in the vicinity of York Factory, Keewatin or on the 

 Athabasca river south of Lake Athabasca. 



