MORGAN HEBARD 377 



Eye one and one-quarter times as long as infra-ocular sulcus. 

 Prosternal spine conical, sharply rounded at apex. Tegmina 

 almost attingent (varying in series from attingent to narrowly 

 separated), with shallow emargination at juncture of distal 

 margins of dorsal and lateral fields distinct (rarely very weak in 

 series). Ovipositor valves of medium length with distal curva- 

 ture decided (as in artemisiae, stronger than in salmonis). 



Seven male and ten female paratypes bear the same data as the 

 type. The extremes measure: length of body c? 17.5 to 18.7, 9 

 22.3 to 24; length of pronotum & 4.2 to 4.6; 9 5. to 5.7; caudal 

 width of pronotal disk tf 2.2 to 2.4; 9 3. to 3.3; length of tegmen 

 cf 3.2 to 4.2, 9 3.8 to 4.9; width of tegmen d 1 2. to 2.2; 9 2.1 to 

 2.8; length of caudal femur <? 9.1 to 9.3, 9 10.7 to 11.8 mm. 



Color as described for salmonis except as follows. Occiput and 

 disk of pronotum light brownish, this continued on dorsal fields 

 of tegmina, but in frequent specimens the lateral fields of the 

 tegmina are definitely darker. Such individuals show a tegminal 

 bicoloration usual in the species of the Rileyanus Group, which 

 group is, however, not at all closely related. Caudal femoral dark 

 bars very weak. Caudal tibiae very pale dull glaucous. 



This interesting series was secured on steep slopes of rock 

 fragments thickly overgrown with sage brush. The species was 

 common only on the steepest upper slopes where there were many 

 tufts of a fine dry yellow grass. The insect is a powerful though 

 slow leaper, suggesting in its actions Oedaleonotum borckii orientis 

 Hebard (another inhabitant of the sage brush in the Great Basin), 

 but instead of immediately jumping into another bush individuals 

 usually leaped about in the open and were consequently much 

 easier to capture. Limited time alone prevented assembling a 

 large series and the spot would have been revisited had we 

 realized that the insect would not be found anywhere else in the 

 hills along the Salmon River. North of that river in this region 

 lemhiensis is apparently supplanted by artemisiae. 



The Montanus Group 



We would have separated montanus and idaho here described 



in a group distinguished from washingtonius and its allies by the 



more contrasting coloration with postocular bar unbroken and 



in sharper contrast, pronotum with definitely weaker demarkation 



TRANS. AM. ENT. SOC., LX. 



