MORGAN HEBARD 367 



colored examples of eumera and intensively colored specimens of 

 ponder osus is decided. 



Both species are at their best in a semi-arid environment. 

 Hence ponderosus is widely and generally distributed through the 

 semi-arid belt of central Texas, while the distribution of eumera 

 is more local, the species being largely confined to the semi-arid 

 sections of the mountains of Trans-Pecos Texas and southeastern 

 New Mexico, the surrounding desert country apparently being 

 too dry for this insect. 



Type. — d 71 ; Lost Mine Peak, Chisos Mountains, Texas. Ele- 

 vation, 5500 to 6500 feet. September 6, 1912. (Rehn and 

 Hebard.) [Hebard Collection, Type no. 560.] 



Size large, form robust (averaging smaller and less robust than ponderosus). 

 Vertex distinctly narrower than in ponderosus, interocular space very slightly 

 wider than proximal antennal joint, the vertex with surface weakly depressed 

 to fastigio-facial angle, the frontal costa weakly depressed in vicinity of the 

 median ocellus. Eye nearly twice as long as infra-ocular sulcus. Pronotum 

 with medio-longitudinal carina well developed on metazona, subobsolete 

 except briefly cephalad on prozona, principal sulcus deep, other transverse 

 sulci weak; disk with lateral margins almost subparallel, very feebly diverg- 

 ing caudad, caudal margin obtuse-angulate produced with apex sharply 

 rounded. Tegmina and wings fully developed (in series falling slightly 

 short of apices of caudal femora to extending a brief distance beyond apex 

 of abdomen). Prosternal spine as in ponderosus, rather elongate, sub- 

 cylindrical, slightly larger mesad than proximad, tapering fairly suddenly at 

 distal extremity to the rather sharply rounded apex. Furcula represented 

 by two small, bluntly obtuse-angulate productions of the tergite. Supra- 

 anal plate as in ponderosus, broadly shield-shaped, the lateral margin briefly 

 convergent and weakly convex, then subparallel, the distal margin strongly 

 bracket-shaped; medio-longitudinal sulcus broad and deep proximad, nar- 

 rower meso-distad, subobsolete distad, lateral portions broadly concave, 

 the disto-lateral carinae indicated by small convexities which are slightly 

 longer than broad. Cerci of same type as developed in ponderosus but 

 smaller, with distal lobe less ample, its axis forming a more obtuse angulation 

 with axis of shaft, its ventral margin not evenly convex. Cercus with mar- 

 gins of shaft in proximal two-fifths weakly convergent, the distal three-fifths 

 formed by a lobe directed dorso-distad, not in bent, longer than broad, about 

 one and one-quarter times as broad as the basal width of the cercus, its mar- 

 gins broadly convex, the ventral margin at its base forming a minute angu- 

 late production with the ventral margin of the shaft, which distad begins to 

 curve ventrad. Subgenital plate full, broad, its dorsal free margins laterad 

 broadly concave to the moderately broad, transverse, thickened and briefly 

 elevated meso-distal portion. 



TRANS. AM. ENT. SOC, XLVI. 



