154 NEW NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



Size large for the genus (averaging about as large as the maximum found in 

 E. signatus Scudder); form medium, as in signatus. Surface well supplied with 

 rather long microscopic hairs, as in signatus. Interocular space narrow, dis- 

 tinctly narrower than in signatus, palustris or pusillus. Fastigium moderately 

 produced and shallowly concave mesad, not deeply so as in those species; 

 frontal costa with lateral margins moderately pronounced, not as sharply 

 carinate. Eye slightly longer than cheek. Antennae elongate, over twice as 

 long as the elongate pronotum. Pronotum with medio-longitudinal carina 

 moderately decided, cut only by principal sulcus, not as decided as in signatus, 

 palustris or pusillus; caudal margin of pronotum very broadly obtuse-angulate 

 produced. Tegmina very slightly overlapping, broadly oval, showing some 

 truncation distad particularly in the distal marginal portion of the lateral 

 field, as long as prozona and half the metazona; humeral angle distinct, the 

 dorsal field being feebly but appreciably defined from the lateral field. Distal 

 portion of abdomen not enlarged. Furcula consisting of two, nearly attingent, 

 Blight convexities, from each of which project beyond the segment a minute 

 rounded projection, the length of which approximates, its width. Supra-anal 

 plate moderately broad shield-shaped; lateral margins subsinuous, weakly 

 convex to the rounded apex; surface rather decidedly concave laterad in 

 proximal two-thirds, mesad raised, strongly sulcate in proximal third with 

 lateral margins of this sulcation strongly carinate. Cercus a, broad plate, 

 slightly less than twice as long as its basal width, surface deplanate; margins 

 feebly convergent to the rather broad, rounded apex, dorsal margin weakly 

 concave, ventral margin weakly convex. Subgenital plate small, convex, 

 tapering to the rather large and produced rounded apex, which is situated 

 mesad on the dorsal free margin (in this respect differing from signatus, palus- 

 tris and pusillus, in which the subgenital plate bears a distinctly subapical 

 tubercle). Prosternal spine stout, moderately elongate, blunt. Interspace 

 between mesosternal lobes considerably over twice as long as its least width. 

 Caudal femora medium, slightly heavier than in signatus. Caudal tibiae with 

 twelve spines (on each margin). 



Allotype. — 9 ; same data as type. [Hebard Collection.] 

 Agrees with male except in the following features. Size much larger, form 

 much more robust. Eye no longer than cheek. Tegmina with dorsal field 

 more distinctly defined from lateral field. Ovipositor valves moderately 

 elongate, not strongly curved distad to their acute apices. Prosternal spine 

 heavier than in male. Interspace between mesosternal lobes about one and 

 one-half times as long as least width. 



Measurements (in millimeters) 



Length of 

 ■7) Length of Length of Length of Width of caudal 



O body pronotum tegmen tegmen femur 



Type. 21 5 4.3 3 12.1 



Paratypes (87). 18.5-22 4.8-5.2 4.1-5.1 2.8-3.1 11.7-12.9 



9 

 Allotype. 26.2 6.8 5.1 3.8 15.8 



Paratypes (30). 25-27.2 6.3-7 4.2-5.7 3.2-3.9 14.8-15.7 



