29 



joints somewhat distinct. Pronotnm sub-cylindrical ; disk sub- 

 convex ; median carina generally obliterated on the anterior lobes, 

 more or less distinct on the posterior lobe, sub-truneate in front, 

 truncate or rounded behind, sometimes obtusely angled, but in the 

 latter instances the posterior lateral mai'gin ascends from the lateral 

 angle to the apex without any entering angle at the humerus ; 

 the three transverse impressions distinct, cutting the median 

 carina ; the intermediate one sub-bisinuate ; posterior lobe punct- 

 ured. Prosternal spine rather short, obtuse ; pectus broad as the 

 head. Ellytra and wings wanting or abbreviated. Four anterior 

 legs short ; in the male the middle femora much swollen ; posterior 

 femora moderately dilated at the base. Extremity of the male 

 abdomen somewhat swollen and turned up ; cerci generally slender. 

 The species may be separated by the following table : — 



. / "Without wings or wing covers ..... glacialis. 



I Wing covers present 2. 



n j Wing covers more than half the lengtli of the abdomen, borealis. 



I Wing covers not more than half the length of the abdomen, manca- 



Pezotettix glacialis. Scudder. 

 The Wingless Mountain Grasshopper. 



Head not large ; vertex furrowed ; frontal costa Avith a deep 

 furrow and depression at the ocellus ; eyes not prominent, not 

 elongate, docked anteriorly, and very slightly above. Pronotura 

 a little widest posteriorly ; anterior and posterior margins trun- 

 cate ; lateral carinai almost obliterated, obtusely rounded ; median 

 very slight. Prosternal spine rather short and blunt, compressed 

 laterally. With neither wings nor elytra. Color, female : ver- 

 tex, disk of the pronotum, and abdomen, olivaceous green; a 

 broad black band behind the eye, crossing the sides of the prono- 

 tum to the tip, extending upon the abdomen in the form of trans- 

 verse streaks ; pronotum below this, greenish yellow, with a medial 

 black spot. Vertex and pectus, greenish yellow ; prosternum, 

 dusky. Front and sides of the head yellowish green, with a 

 greenish stripe down the middle of the frontal ridge. Furrow and 

 interior carina of the under side of the hind femora, coral red ; re- 

 mainder yellowish green, with two broad bands of darlc green 

 across the outside ; apex, black ; tibine, green. 



Male differs as follows : mesouotum and metanotum, bright 

 green ; whole dorsal surface black, with a dorsal row of yellowish 

 green spots, and a triangular spot of the same color between the 

 middle and posterior coxae ; a lateral row of greenish-yellow spots 

 on the first eight abdominal segments. 



