390 FAMILY VI. ACRIDIDJ3. THE LOCUSTS. 



into a slender compressed, sub-styliform tip, the whole appendage being one 

 and three-quarters or twice as long as the width of base." (Morse.) 

 Females inseparable from those of islandicus. Furcula of males somewhat 

 longer and stouter, finger-like projections lying parallel on or within the 

 bases of the median ridges instead of somewhat obliquely across them as 

 in islandicus. 



M. si/1 rest ris was described from Blowing Rock, Linville and 

 and Pineola, N. Car., the specimens being taken July 13 and Au- 

 gust 28 in cold deciduous forests, where they were found leaping 

 actively about among the undergrowth of Vaccinium, Gaultlieria. 

 Galax, etc., at elevations of 3,500 to 4,000 feet. 



Morse (loc. cit.) says: "The three species islandicus, celatus 

 and sylvestris are evidently nearly related descendants of the same 

 parent form, modified by isolation. Intergrades may yet be dis- 

 covered." R. & H. (1016, 229) record si/lrestrds from several 

 points in Rabuu Co., Ga., and from Black Mountain, N. Car., and 

 add: "This form is clearly an offshoot of M. islandicus as stated 

 by Morse, probably but a geographic race." Since the form of the 

 cerci, furcula, etc., are known to be extremely variable in other 

 species of short-winged Melanopliis. I place sulvestris as a south- 

 ern variety or race of islandicus. 

 ISO. MELANOPLUS CELATUS Morse, 1904a, 10. 



Closely related to M. islandicus, agreeing with it in size, coloration, 

 markings and form. The males differ in the form of cerci, as described 

 in key (Fig. 135, g) and in having the furcula longer, more robust, lying 

 parallel on the bases of the median ridges; subgenital plate wider, much 

 less tapering, its apex narrowly rounded, not conical as in islandicus. 

 Females scarcely separable, somewhat stouter, pronotum wider, tegmina 

 larger, more approximate above. 



Monterey, Ya., Aug. 20 Sept. 11 (Fox). Morse's types were 

 from Wytheville, Va., where they were found in shrubby growth 

 among pines on dry stony soil at a height of 3,000 to 3,500 feet. 

 In the mountain sections of Virginia Fox has taken celatus at Jar- 

 man Gap, Monterey and Hot Springs, July 30 Sept. 7. He states 

 (1917, 220) that it "appears to be very sporadic in distribution 

 and usually very scarce. All specimens were taken in or close to 

 open deciduous woods on mountain slopes in grassy or shrubby 

 undergrowth." 

 181. MELANOPLUS DIVERGENS Morse, 1904a, 8. 



Size and appearance of other members of the series, but easily distin- 

 guished by the sub-bifurcate cerci. General color as in the others, the 

 fuscous markings on sides of hind femora more evident. Vertex blunt. 

 Pronotum broad with flattened disk, subangulate at junction with lateral 

 lobes, the midcarina distinct on metazona, absent on prozona. Prosternal 

 spine short, usually conical with acutely pointed tip, sometimes much 



