SUBFAMILY III. LOCUSTIN.E. 341 



the United States, the others from the Old World. Of its distribu- 

 tion Scudder (1897, 97) says: ''This genus is more widely ex- 

 tended than any other of the Melanopli, being the only one not 

 confined to America. It is a distinctly boreal type and encircles 

 the globe. The species are largely confined to high altitudes as 

 well as high latitudes, a number being alpine or subalpine in their 

 respective localities. In this country the species are known from 

 two widely separated regions; in the west, the Rocky Mountain 

 region from Alberta to northern New Mexico ; and in the east from 

 western Ontario and New York to Maine." 



Our eastern species have the tegmina wholly wanting while 

 those found in the western states, with the exception of one, have 

 them present but abbreviated, thus resembling closely many forms 

 of the genus Melanoplus. Two species and one race or variety 

 have been described from our territory. 



KEY TO EASTERN SPECIES OF PODISMA. 



. Upper and outer faces of hind femora nearly uniform green, or the 

 upper face faintly banded above; antennae of male not longer than 

 hind femora; front dorsal margin of thorax slightly but obviously 

 rounded and feebly emarginate at middle. 



b. Antennae distinctly shorter than hind femora, male, nearly three- 

 fourths as long, female; upper face of hind femora without 

 darker bars; cerci stouter, not obviously narrower at middle 

 than at apex (Fig. 118, c.) 151. GLACIALIS. 



bb. Antennae about as long, male, or five-sixths as long, female, as 

 hind femora; upper face of hind femora faintly bifasciate with 

 darker green; cerci longer, slightly narrower at. middle than at 

 apex or base. 151a. CANADENSIS. 



aa. Upper and outer faces of hind femora distinctly bifasciate with fus- 

 cous; antennae of male one-fourth or more longer than hind femora; 

 front dorsal margin of thorax squarely truncate; cerci of male very 

 slender, strongly narrowed at middle. (Fig. 118, d.) 



152. VARIEGATA. 



151. PODISMA GLACIALIS (Scudder), 1863, 630. Wingless Mountain Locust. 



Dark olivaceous green above, greenish-yellow beneath, sparsely clothed 

 with erect hairs; often drying to dull reddish-brown. Head greenish-yel- 

 low, the face often with a darker streak, mouth parts paler. Pronotum 

 dark green, the lower third of lateral lobes yellow bordered above by a 

 shining black stripe extending back from eye but fainter on metazona and 

 sides of abdomen, where it is broken to form quadrate blotches or short 

 bars. Inner and lower faces of hind femora in great part coral-red. Hind 

 tibiae bluish-green, the spines black at tips. Vertex between the eyes as 

 broad, male, or twice as broad, female, as the first antennal joint. Fas- 

 tigium widened and sulcate, male, or very feebly concave, female, in front 

 of eyes, its sides continuous with those of frontal costa. Face distinctly, 

 not strongly, oblique; frontal costa as broad as interocular space, male, 



