NO. 1124. REVISION OF THE MELANOPLI SC UDDER. 227 



50. MELANOPLUS DAWSONI. 

 (Plates I, tig. a; XV, fig. 5.) 



Pezotettix dawsoni SCUDDER!, Daws. Rep. Geol. Rec. 49tb Par. (1875), p. 343; Butt. 

 Orth. N. A. Bound. Comrn. (1875), p. 3; Can. Ent., XII (1880), p. 75. CAUL- 

 FIELD, Rep. Ent. Soc. Out., XVIII (1886), p. 71; Can. Rec. Sc., II (1887), 

 p. 401; Can. Orth. (1887), p. 13. 



Pezotettix lellnstris SCUDDER!, Ann. Rep. Chief Eng., 1876 (1876), p. 502; Ann. 

 Rep. Geogr. Snrv. 100th Mer., 1876 (1876), p. 282; Can. Ent., XII (1880), p. 

 75. BRUNER, Rep. U. S. Eut. Coinm., Ill, (1883), p. 59. 



PezoteUix abditum DODGE!, Can. Ent., IX (1877), p. 113. SCUDDER!, Can. Eut., 

 XII (1880), p. 75. BRUNER, Publ. Nebr. Acad. Sc., Ill (1893), p. 27. 



Melanoplus abditum OSBORN, Proc. Iowa Acad. Sc., I, Pt. 11 (1892), p. 118. 



Obscure fusco testaceous. Head slightly prominent in the male 

 only, olivaceo-testaceous, iufuscated above, with a broad piceous, post- 

 ocular band; vertex tumid, distinctly elevated above the pronotum, 

 the interspace between the eyes rather broad, at least twice as broad 

 as the fii st antennal joint ; fastigiurn steeply declivent, plane, the lateral 

 margins feebly and broadly elevated ; frontal costa broad, subequal, as 

 broad as the interspace between the eyes, fading out before reaching 

 the clypeus, above plane (male) or feebly convex (female), at and 

 below the ocellus slightly sulcate, everywhere punctate, with a tend- 

 ency above to a biseriate arrangement; eyes not very large, not 

 prominent, scarcely longer than the iufraocular portion of the genae; 

 antennae ferruginous, four-fifths (male) or three fifths (female) as long 

 as the hind femora. Pronotum subequal (male) or distinctly compressed 

 above anteriorly (female), short, the disk transversely a little convex 

 and passing into the vertical lateral lobes by a rounded angle, which 

 is nevertheless so abrupt as to form, at least in the male, tolerably dis- 

 tinct lateral carinae; lateral lobes lighter colored below than the disk, 

 above on the prozona a broad, lustrous, dark colored band, sometimes 

 obsolete, sometimes deepening to piceous; median carina slight, per- 

 current, equal, but blunter on the prozona than on the metazona; front 

 margin feebly convex, with a slight mesial emargination not always 

 distinct, hind margin obtusangulate equally in macropterous and 

 brachypterous forms; prozona distinctly longitudinal (male) or quad- 

 rate or subquadrate (female) a third to a fourth longer. than the more 

 closely punctate metazona. Prosternal spine very short and blunt, 

 rather stout, somewhat transverse; interspace between mesosternal 

 lobes half as long again as broad (male) or a little transverse (female). 

 Tegmina brownish fuscous, more or less feebly flecked with fuscous 

 and either greatly surpassing the hind femora, moderately broad and 

 subequal nearly to the well rounded tip (M. d. completus, Plate I, fig. ), 

 or ovate-lanceolate, apically subacuminate, a little longer than the 

 pronotum only (M. d. tellustris}; wings when fully developed ample, 

 hyaline, with pale brownish fuscous veins, paler and sometimes wholly 

 pallid in the anal area. Fore femora of male very feebly enlarged; 



