276 FAMILY VI. ACRIDIDJ3. THE LOCUSTS. 



Kirby, who does not recognize races or varieties in his Cata- 

 logue, though he includes numerous known synonyms as species, 

 accredits to Spharagemon (1910, 233) 11 species, ten from the 

 United States and one from Mexico. I believe that two of the so- 

 called varieties of Morse are valid species, and recognize five spe- 

 cies as inhabiting the Eastern States. 



KEY TO EASTERN SPECIES OF SPHARAGEMON. 



o. Hind tibiae with a distinct pale ring on basal third, back of or behind 

 which is a black one of equal width; median carina of pronotum 

 equally compressed throughout (Fig. 90, c, d.) 



b. Apical two-fifths of hind tibiae bright coral-red : hind margin of 



metazona of male obtuse- or at most right-angled. 118. BOLLI. 

 ~bl). Apical two-fifths of hind tibiae dull brownish-yellow, tinged with 

 fuscous; hind margin of metazona of male acute-angled. 



119. CREPITAXS. 



aa. Hind tibia? usually wholly red or dull yellow, rarely with a pale sub- 

 basal ring, and this then without a black one behind it; basal or dis- 

 tal third of prozonal disk more or less elevated and broadly joined to 

 median carina, making the latter unequally compressed at that 

 point (Fig. 90, e, g.) 



c. Median carina of prozona with upper edge more or less sinuate; 



hind margin of metazona obtuse- or at most right-angled; hind 

 tibiae with an ill defined pale ring near base. 



d. General color grayish-brown, the tegmina distinctly mottled and 

 barred with fuscous; median carina of pronotum relatively 

 high, distinctly arched on metazona; posterior prozonal tip of 

 median carina projected back partly over the deep suboblique 

 notch. (Fig. 90, g.) 120. SAXATILE. 



dd. General color purplish-brown, the tegmina but feebly maculate; 

 median carina of pronotum, especially in female, very low, 

 nearly straight on metazona; posterior prozonal tip of carina 

 not projected backward over the shallow nearly vertical notch. 



121. PLANTJM. 



cc. Median carina of prozona cristate with upper edge straight or 

 feebly arched, its hind margin strongly projected backward to 

 partly or wholly cover the very oblique notch (Fig. 90, e, f ) ; 

 hind margin of metazona acute-angled; hind tibiae without a 

 pale ring at base. 122. WYOMINGIANUM." 



118. SPHARAGEMON BOLLI Scudder, 1875a, 469. Boll's Locust. 



Size large for the genus, the males but little the smaller. Ground 

 color variable, that of male usually grayish or fuscous, of female rusty 

 brown or pale buff, the face grayish or yellowish; antennae brownish or 

 grayish at base, fuscous at apex. Tegmina sprinkled throughout with 

 minute blackish spots, these in male aggregated into three more or less 

 distinct dark cross bars; female often with only faint traces of these bars 



"A northwestern species, S collarc Scudder, has been recorded from northern Illi- 

 nois by Scudder (iSysa, 470) and from northern Indiana by Morse (18953, 297), but 

 these records were probably based on 5". wyomingianum as no specimens of undoubted 

 collarc from either of these two states have been taken in recent years. 



