386 NEW NORTH AMERICAN MELANOPLI (ORTHOPTERA) 



subobsolete, represented by minute points on the margin of the penultimate 

 tergite, which are not as long as broad. Supra-anal plate triangulate shield- 

 shaped, the lateral margins straight, strongly raised and almost parallel in 

 proximal half, straight and convergent to sharp apex in distal half; surface 

 of plate showing a shallow percurrent medio-longitudinal sulcus, in proximal 

 half bordered by low ridges which are flanked by deep concavities caused by 

 the raised lateral margins, distal half with two decided marginal carinae, 

 running from the lateral angles to the apex of the plate and broadly convex 

 to the lateral margins, so that on each side the distal portions of the cerci 

 fit into the intervening space. Cerci heavy, three times as long as basal 

 width, curving inward distad so that the apices, extending beyond the apex 

 of the supra-anal plate, fit in snugly beside the apices of the paired plates 

 beneath the supra-anal plate; ventral margin broadly concave to the produced 

 apex, dorsal margin more broadly concave to dorsal extremity, beyond which 

 the distal margin of the cercus is rather gently oblique and almost straight 

 to the produced apex, least width of shaft three-quarters proximal width, 

 greatest width of distal portion distinctly greater than proximal width; 

 distal portion with angles rounded and lamellate toward the distal 

 margin. The cercus is heavier, with more decided distal expansion and 

 lamellation and much greater production of the apex, which is situated ven- 

 trad, than in validus. Subgenital plate with a distinct median production 

 of the free margin, this margin somewhat thickened latero-proximad and in 

 the rather broadly transverse produced portion. 



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

 Agrees with type except in the following characters. Size larger, form 

 more robust. Sulcation of vertex and frontal costa weaker and broader. 

 Eye about one and two-thirds times as long as infra-ocular sulcus: Prosternal 

 spine heavier. Ovipositor valves rather strongly curved. 



Measurements (in millimeters) 



Caudal 



Length Length. width of Length Width Length of 



of of pronotal of of caudal 



(j body pronotum disk tegmen tegmen femur 



Divide, Oregon, 



type 22.5 5 3.1 5.3 2.9 11.2 



Divide, Oregon, 



paratypes (76) 19.8-25 4.5-5.2 2.7-3.1 4.1-5.9 2.8-3.1 11-12.6 

 Drain, Oregon, 



(2) 20.7-23 5-5.1 2.8-3 5.2-5.6 2.9-3 11.8-12 



9 

 Divide, Oregon, 



allotype 25.8 5.9 3.9 5.9 3.5 13.8 



Divide, Oregon, 



paratypes (67) 20.7-27 4.3-6.2 3.3-4.3 5-6.7 2.9-4 10.9-15 

 Drain, Oregon.... 23.2 5.7 3.7 5.1 3.1 12.8 



