yellow (most common) to red, brown, or blue ... C carinata Rehn RIDGED GRASSHOPPER 48b.Median crest on metazona low (Fig. 138). Median crest on prozona variable, sometimes bilobate. Hind tibiae red (most common) to yel- low   ................................................................................................. 49 49a. Tegniina with large, dark bands. Lateral lobe of pronotum sharply pointed downward (Fig. 138). Hind tibiae red to yel- low, never blue-gray ... C. sulcifrons (Scudder) GROOVE- HEADED GRASSHOPPER 49b. Tegniina with less distinct markings. Lateral               'lobe of pronotum not pointed as above. Hind tibiae red to yellow or blue-gray to brownish ... C texana (Bruner) 50a. Median crest of pronotum obsolete, cuts by sulci barely distinguishable (Fig. 139). Tegmina markings fain@ hind wings transparent blue. No indication of dark band present on hind wings. Does not crepitate in flight ... Anconia hebardi Rehn 50b.Median crest of pronotum low but distinct. Cuts by sulci distinct (Fig. 140,141). Tegminal markings often pro- nounced. Hind wings variable in color, with central dark band pronounced to faintly indicated (exception: some T. sparse have no Uwe of band). AU species crepitate in flight ... (Trimerotropis and Spharagenwn in part)                   ......   5 1 5 la. Lower posterior margin of pronow lateral lobes pro- jected to an acute point or rounded with a tooth pro- jecting down (Fig. 140,141). Hind tibiae md or or- ange  ......................................................................... 52 5 lb.Lower posterior margin of pronow lateral lobes sim- ply rounded      ............................................................. 55 52a. Lower posterior margin of lateral lobes extended downward into a point (Fig. 140). Inner face of hind femora orange or red           ............................... 53 52b.Lateral posterior margin of lateral lobes rounded, but with a small tooth-like projection (Fig. 141). Inner face of hind femora whitish or yellow... 54 53a. Inner face of hind femora with black bands ... T. agrestis McNeill TOOTHED FIELD GRASSHOPPER 53b.Inner face of hind femora without black bands ... T barnumi Tinkham 54a. Tegraina with distinct darkened crossbands (Fig. 142). Band on hind wing not continuing to anal edge ... T. call Bruner. Color plate 7.