330 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



109. MELANOPLUS MARGINATUS. 



(Plates I, lig. j; XXII, fig. 5.) 



Pezotettix maryinatm SCUDDER!, Ann. Rep. Chief Eng., 1876 (1876), p. 504; 



Ann. Rep. U. S. Geogr. Surv. 100th Mer., 1876 (1876), p. 284 ; BRUNER, Rep. 



U. S. Ent. Comm., Ill, p. 59 (1883). 

 Euprepocnemis occidentalis Bruner!, MS. 



Of medium size, slender. Head not prominent, but slightly pro- 

 jecting, the face retreating more than usual, nearly at right angles with 

 the not very steeply declivent fastigium; vertex very gently tumid, 

 scarcely elevated above the pronotum, the interspace between the eyes 

 a little broader than (male) or twice as broad as (female) the first 

 antennal joint; fastigium rather deeply (male) or slightly (female) sul- 

 cate; frontal costa percurrent, equal, about as wide as the interspace 

 between the eyes, shallowly sulcate at and below the ocellus, punctate 

 throughout; eyes not very large, moderately prominent in the male 

 only, a little longer, especially in the male, than the infraocular portion 

 of the genae; antennae at least three-fourths (male) or about four- 

 sevenths (female) as long as the hind femora. Pronotum rather long, 

 the dorsum equal, with slightly sloping sides, distinct but rather slight 

 and equal median carina, and distinct though very obtuse lateral cari- 

 nae; hind border scarcely angulate. Prosternal spine rather small, 

 bluntly subconical, a little retrorse; interspace between inesosternal 

 lobes more than twice as long as broad (male) or a little longer than 

 broad (female). Tegruina either surpassing considerably the hind 

 femora, moderately broad, subequal beyond the basal expansion of the 

 costa, well rounded apically (M. m. amplus, Plate I, fig. i), or slightly 

 longer than the pronotum, ovate lanceolate, apically acuminate, over- 

 lapping, the costal margin very strongly arcuate, about twice as long 

 as broad (M. m. pauper), brownish testaceous; wings a little shorter 

 than the tegraina, ample, faintly infumate apically and anteriorly, the 

 veins and cross veins black or blackish iuscous. Fore and middle 

 femora considerably tumid in the male; hind femora rather slender, 

 compressed; hind tibiae with eleven to thirteen spines in the outer 

 series. Extremity of male abdomen clavate, somewhat recurved, the 

 supraaual plate triangular, the apex acutangulate but blunt, the sur- 

 face tectate with a moderately deep and narrow median sulcus in the 

 basal two thirds; furcula consisting of a pair of slight but coarse 

 approximate denticulations; cerci straight, rather stout, moderately 

 long, noticeably but broadly constricted in the middle, the tip larger 

 than the base, gibbous, the whole scarcely depressed, curving slightly 

 downward beyond the middle; subgeuital plate small, subconical, 

 ending in a minute tubercle. 



General color dull pale olivaceous brown, slightly darker above, with 

 a broad black stripe, occasionally obsolescent, extending from behind 

 the eye along the upper half of the lateral lobes of the prozona; pleura 



