290 OaTHOPTERA OF NOVA SCOTIA. — PIERS, 



a. Wing-covers much longer than pronotum. 



b. Large, robust; hind femora 15 mm. or more (usually 17 mm.); two 



distinct yellow stripes on head, pronotum, and wing-covers 



19. bivittatiLS (femoratxis), p. 303. 



bb. Smaller; hiud femora not over 15 mm. 



c. DovetaiUng interspace between mesosternal lobes (between 



second legs)* longitudinal or quadrate; wing-covers usually 



passing hind femora; prozona not swollen. 



d. Prostemal spine nearly cylindrical, its tip bluntly rounded; 



cerci 1 ^ or 2 times as long as their greatest width, sharply 



pointed, somewhat acuminate, the converging sides sUghtly 



concave 17. femur-rubrum, p. 297. 



dd. Prostemal spine tapering, its tip pointed; cerci shorter, 

 only about l^i times as long as their greatest width, 

 rather blunt at tip, the converging sides straight or convex. 



15. atlanis, p. 290. 

 cc. Dovetailing interspace between mesosternal lobes sub-quadrate 

 or distinctly transverse; wing-covers not passing hind femora; 

 prozona swoUen. 



e. Wing-covers about reaching end of hind femora. 



f . Scoop of ovipositor (as seen from side) very short, 

 deeply concave, with a single denticulation or 

 none at base of outer edge; lower valves with 

 tips correspondingly short and decurved; hind 



tibiae usually glaucous but sometimes red 



[minor, footnote p. 307.] 



ff. Scoop of o\'ipositor rather long and less deeply 



concave, the outer edge of basal half rather deeply 



notched, crenulate-denticulate, the tips of both 



pairs of valves long and evenly tapering; hind 



femora coral-red [luridus, footnote p. 307.} 



ee. Wing-covers not reaching end of hind femora, covering 

 about H to ^ of abdomen (but surpassing hind femora 

 in rarer long- winged form). 

 ~ ' g. DuU graj'ish brown above, clay-yellow below. 



[16. fascialus (curtis), p. 296.] 



gg. Dark greenish 3'ellow, tinged with fuscous. 



18. extremus (Junius), p. 301. 



aa. Wing-covers shorter than pronotum, sub-oval. . [mancus, footnote p. 307.1 



15. Melanoplus atlanis (Riley). Lessicr Migratory 

 Locust. 

 Melanoplus atlanis. Piers, Trans. N. S. Inst. Sc, ix, 

 215 (1896^; Halifax. Cow Bay (Hx. Co.), and Sable 

 Island. — Gooderham, Proc. Ent. Soc. N. S. for 

 1916, 24, 27 (1917); Col., Cum., Kin^s, Hants, 

 Ann., Digliv, Yar., Queens, Pict., Vict., and Inv. Cos. 



*Tlus interspace is a squarish tongue of the meta.sternum which dovetails forward into 

 the middle posterior part of the mesosternum. It is situated between the second pair of legs. 



