1906.] NATURAL SCIENCES OF PHILADELPHIA. 365 



Springs one was taken on the hillside among sage-brush. At Ivnob 

 Hill two were captured on the prairie, while at Akron it was taken in 

 a dry situation near the railroad. 



AMPHITORNUS McNeill. 

 Amphitornus coloradus (Thomas). 



1872. S[tenobothrus] bicolor Thomas, Prelim. Rep. U. S. Geol. Sur. INIontana, 

 p. 465.3 



1873. S[tenobothrus] coloradus Thomas, SjTiopsis Acrid. N. Amer., p. 82. 

 ]\Iammoth Hot Springs, Yellowstone Park, Aug. 5, 4 9,1 nymph. 



Summit of foothills near Mammoth Hot Springs, 6,500 feet, Aug. 5, 3 

 9 . Hill at head of Mammoth Hot Springs, 7,000 feel, Aug. 5, 1 9 . 

 Salt Lake City, Utah, Aug. 13, 1 9 . Hill near Salt Lake City, 4,700 

 feet, Aug. 13 and 14, 3 cJ^, 2 9 . Knob Hill, Colorado Springs, Colorado, 

 Aug. 17-22, 4 c?, 1 9 . Prairie land, Colorado Springs, Aug. 18, 1 9 . 



The series examined contains both the typical form and the suffused 

 form called "Var. a" by Thomas. This is apparently the first record 

 of the species from Utah. 



This species was found in Wyoming, Utah and Colorado in almost 

 the same numbers. Each specimen seen was captured, if that was in 

 any way possible. The insect was found among the sage on hillsides 

 and also among the grasses of the prairie. 



OPEIA McNeill. 

 Opeia obscura (Thomas). 



Salt Lake City, Utah, Aug. 13, 1 9 . Colorado Springs, Colorado, 

 Aug. 18, 1 9 . Knob Hill, Colorado Springs, Aug. 17-22, 65 d"', 62 9 . 

 Prairie land, Colorado Springs, Aug. 18, 2 c^, 2 9. Garden of the 

 Gods, Colorado, Aug. 19, 1 &. 



Specimens of this species were received from Prof. C. P. Gillette from 

 Merino, Lamar, Snyder and Fort Collins, Colorado, labelled Eritettix 

 variahilis with a query. The Salt Lake City specimen is apparently 

 the first recorded west of the Rockies. 



About Colorado Springs on the prairie this species was to be found 

 in countless numbers. The males are very rapid in their movements, 

 but so common were they that sometimes over a dozen would be taken 

 with one sweep of the net. 



CORDILLACRIS Rehn. 

 Cordillacris occipitalis (Thomas). 



Colorado Springs, Colorado, Aug. 18, 1 9 . Knob Hill, Colorado 



3 Invalidated by Stenobothnis bicolor (Charpentier) , the combination dating 

 from Selys-Longciiamps, 1868 (Ann. Soc. Entom. Belg., XI, p. 31). 



