382 NEW NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



the forest undergrowth from 4200 to 5600 feet, two females being 

 secured in the Canadian Zone forest up to 5000 feet, the others 

 in the alpine undergrowth of a forest of scattered pine and alpine 

 hemlock, where an interdigitating flora of the Canadian and 

 Hudsonian Zones occurred. 



Melanoplus oreophilus new species (Plate XVII, figs. 6 and 7.) 



This species is very closely related to M. montanus (Thomas) 

 and M. washingtonianus (Bruner), showing nearer affinity to the 

 latter. 



Compared with these species, it is found to differ in both sexes 

 in the average darker coloration, less sharply defined color pat- 

 tern and deep pink coloration of the ventral and internal faces 

 of the caudal femora. Occasional individuals of oreophilus, how- 

 ever, have the color pattern more intensive. The tegmina 

 average narrower in washingtonianus and oreophilus than in mon- 

 tanus, in which latter species they are usually broad lanceolate. 



The male genitalia are distinctive. In oreophilus the cerci are 

 distinctly more slender and show a slight expansion distad, the 

 margins there being weakly convex and giving to the apices of 

 the cerci a weakly spatulate contour, not shown in either mon- 

 tanus or washingtonianus. The male subgenital plate is more 

 drawn out, with apical tubercle slightly more sharply rounded 

 than in washingtonianus. In montanus this tubercle is usually 

 obsolete, rarely bluntly indicated. 



Type. — cf; Cloud Cap Trail, Mount Hood, Oregon. Eleva- 

 tion, 6000 to 7000 feet. August 18 to 20, 1910. (Rehn and 

 Hebard.) [Hebard Collection, Type no. 559.] 



Size medium, form moderately robust. Vertex narrower than in washing- 

 tonianus, 2 * surface shallowly depressed between the distinct lateral carinae; 

 frontal costa weakly depressed in vicinity of median ocellus. Eye about one 

 and one-half times as long as infra-ocular sulcus. Pronotum much as in 

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

 on prozona (frequently obsolete between the sulci) ; transverse sulci weak, 

 caudal margin of disk weakly obtuse-angulate produced with angle broadly 

 rounded. Prosternal spine rather sharply conical (varying in the series to 

 blunt conical ). 2S Tegmina as in washingtonianus, slightly longer than prono- 



25 This is an unreliable character, as the series shows variation in this feature 

 to a condition in which it is as wide as in washingtonianus. 



26 In montanus we find the prosternal spine to vary from very blunt and 

 distinctly transverse to blunt conical. It is clear that this process is subject 

 to decided variation in the group to which these species belong. 



