MORGAN HEBARD 381 



The male genitalia are distinctive. The cerci are not inbent 

 distad, the tubercle of the subgenital plate is subapical, these 

 features and the general structure of the penis indicating that the 

 insect is a member of the Montanus Group and not of the Artemi- 

 siae Group. The distal tapering of the cerci is distinctive, these 

 appendages otherwise suggesting those of montanus (Thomas) and 

 idaho here described more closely than those of the succeeding 

 species. 



Type. — cf; upper Morgan Creek, Salmon River Mountains, 

 Idaho. Elevation 7080 feet. August 15, 1928. (Rehn and 

 Hebard). [Hebard Collection, Type no. 1273.] 



Size and form medium. Vertex as in oreophilus Hebard, surface 

 shallowly concave between the distinct lateral carinae, frontal 

 costa weakly depressed particularly in the vicinity of the median 

 ocellus. Pronotum similar; medio-longitudinal carina weak on 

 metazona, very weak on prozona and obsolete between the trans- 

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

 duced with angle broadly rounded. Prosternal spine very blunt 

 conical. Tegmina short, shorter than pronotum, feebly over- 

 lapping (to narrowly separated in other male paratypes) ovate 

 pads, slightly more sharply rounded (to broadly rounded in one 

 male paratype) at apices (not lanceolate as in the other species of 

 this group). Furcula represented by two very small stout pro- 

 cesses springing from weak convexities of the tergite, the pro- 

 jecting portion no longer than broad. Supra-anal plate tri- 

 angularly shield-shaped, no longer than proximal width and 

 definitely shorter than in oreophilus; surface little specialized, 

 medio-longitudinal sulcus percurrent but deep only in proximal 

 two-fifths. Cercus small and simple, about three times as long 

 as proximal width, dorsal margin concave and ventral margin 

 convex particularly proximad, these margins gradually convergent 

 to the rounded apex; the apical two-fifths of the cercus with 

 external surface very feebly and irregularly impressed. Sub- 

 genital plate with a small blunt subapical tubercle. 



Allotype. — 9 ; same data as type. [Hebard Collection]. 



Agrees with type except as follows. Size much larger, form 

 much more robust. Vertex broader. Eye one and one-third 

 times as long as infra-ocular sulcus. Prosternal spine shorter. 

 Tegmina separated by a narrow interspace (and similar in the 

 four paratypic females), sublanceolate (individually variable, in 

 two female paratypes with apices broadly rounded) . Ovipositor 

 valves moderately elongate, with distal curvature moderately 

 decided. 



TRANS. AM. ENT. SOC, LX. 



