MORGAN HEBARD 379 



Montana; Crescent Hill in the Yellowstone National Park and 

 the Big Horn Mountains of Wyoming: west to Banff, Alberta; 

 the Swan Range, Beaver Creek and West Yellowstone, Montana: 

 south to the latter, Norris Pass in the Yellowstone National Park 

 and the Big Horn Mountains, Wyoming. 



In its distribution southward it becomes paler, more con- 

 trastingly marked and larger, males measuring as follows : 



cf 





Length 



of 

 body 



Length 



of 



pro- 



notum 



Cauda] 



width 



of 



pro- 

 notal 

 disk 



Length 

 Length of 



of caudal 

 tegmen femur 



Cold Lake, Alberta. 

 Banff, Alberta. 





11.1 

 16.8 



2.7 

 3.8 



1.4 

 2.3 



2.8 6.9 

 3.8 7.9 



Waterton, Alberta. 





18.3 



4.7 



2.7 



4.1 9.8 



Bozeman Mountain, 



Montana. 



19.8 



4.8 



2.9 



5. 10.2 



Mammoth Hot Springs, Wyoming. 



20. 



4.7 



2.9 



4.8 10.3 



Melanoplus idaho new species (PI. XXVI, fig. 6; pi. XXVII, figs. 6 and 8) 

 This striking species is very closely related to montanus 

 (Thomas). In coloration it shows as great contrasts as the 

 maximum developed in that species. The male cerci are mesad 

 definitely bent upward but the penis shows decidedly the most 

 distinctive development. 



Type. — d 71 ; Cow Creek, Lemhi Range at Salmon River, Idaho. 

 Elevation 4350 feet. August 13, 1918. (M. Hebard). [Hebard 

 Collection, Type no. 1261]. 



Size larger and form more robust than in salmonis here de- 

 scribed, much as in males of montanus from southern Montana. 

 Vertex beyond eyes strongly declivant with impression narrow, 

 frontal costa feebly impressed only about median ocellus. Pro- 

 notum with lateral carinae obsolete on prozona and very weak 

 on metazona so that the disk merges into the lateral lobes more 

 gradually than in montanus and much more gradually than in 

 salmonis, medio-longitudinal carina weak on metazona, very weak 

 on prozona and obsolete there between the decided transverse 

 sulci; caudal margin of disk very weakly obtuse-angulate pro- 

 duced. Prosternal spine rounded conical. Tegmina short, 

 shorter than pronotum, separated by a narrow interval, ovate 

 pads with apices sharply rounded. Furcula represented by two 

 small stout truncate processes springing from weak convexities 



TRANS. AM. ENT. SOC, LX. 



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