1906.1 



NATURAL SCIENCES OF PHILADELPHIA. 



369 



species appeared to be very local in habitat and, if a colony of the 

 insect is not found, long search for the species 

 would very probably be useless, 



STATJKODERUS Bolivar.^ 

 Stauroderus curtipennis (Harris). 



Muir, Bozeman Tunnel, Park-Gallatin Co., 

 Montana, Aug. 12, 1 9 . Sappington, Gallatin 

 Co., Montana, Aug. 12, 1 d". Hill at head of 

 Mammoth Hot Springs, Yellowstone Park, Aug. 

 5, 2 cJ*, 1 ? . Fountain, Lower Geyser Basin, 

 Yellowstone Park, Aug. 6, 1 6^. Near Grand 

 Canon, Yellowstone Park, 8,000 feet, Aug. 10, 

 2 c?, 2 ? . Yellowstone Lake, Aug. 8, 5 d', 4 

 9 , Emerald Springs, Yellowstone Park, Aug. 

 7, 2 c^ , 2 9 . Knob Hill, Colorado Springs, Aug. 

 17, 1 9 . Manitou, Colorado, Aug. 16 and 23, 

 5 cJ^,5 9.- 



These specimens vary considerably in size and 

 somewhat in structure, but such variation is par- 

 alleled in Eastern specimens, from which they 

 cannot be separated. 



This species was rather boreal in distribution and was found in 

 numbers in tall marshy grass in a large open pasture on the shore of 

 Yellowstone Lake. It was also found plentiful at Manitou, Colorado, 

 in the same locality as Chloealtis ahdominalis. At Muir, Mammoth 

 Hot Springs and Manitou the species was found in dry locations, 

 all the other localities in which it was found being more or less damp. 

 The stridulations of the males resemble sik-sik-sik-sik swiftly repeated, 

 the sound being neither loud nor sharp. 



Fig. 5. — Chloealtis ah- 

 dominalis (Thomas). 

 Mammoth Hot 

 Springs, Yellowstone 

 Park. Dorsal view 

 of head and prono- 

 tum of female. (X3.) 



PLATYBOTHRUS Scudder. 

 Platybothrus brunneus (Thomas). 



]\Lammoth Hot Springs, Yellowstone Park, Aug. 5, 2 d^. Suimnit 

 of foothills near Mammoth Hot Springs. Aug. 5, 4 d^, 4 9 . Sunmiit 

 of foothill of Gallatin Range, Mammoth Hot Springs, Aug. 5, 1 d^, 5 9 . 



' This generic name (Catal. Sinopt. Ortopf. Fauna Iberica, pp. 46, 57, 1898) 

 should be used in this connection in place of Stenobothrus if we recognize Bolivar's 

 di\-isions as genera, as has been done by Burr {Entom. Record and Journ. Variat., 

 XVI, p. 320) . If these groups are recognized as of only subgeneric rank, Fieber's 

 Chorthippus must be used as the generic term in place of Stenobothrus, as has 

 already been done in several previous papers by the senior author. 



