more teeth in outer row. Male subgenital plate acutely conical. Fe- male ovipositor valves moderately exserted ... Syrbula                   ...............  13 13a. Hind wings black. Tegmina usually without spots                     ... S. moniezunw (Saussure) SLANT-FACED GRASSHOPPER. Color plate 6 13b. Hind wings clear. Tegmina spotted ... S. a&Wrabilis (Uhler) SLANT-FACED GRASSHOPPER. Color plate 6. 14a. Hind tibiae orange or red, with white subapical band and apex black. Hind femora with outer face not bicolored. Antennae black with white fip ... Acantheruspiperatus Scudder & Cockerell SLENDER RANGE GRASSHOP- PER. Color plate 1. 14b. Hind tibiae brown, rarely orange, without black on apex. Hind femora with outer faces bicolored, upper half dark and lower half pale. Antennae pale ... Cordillacris                  ......  15 15a. Side of tegn-dna with white streak. Dark spots on teg- niina small and dispersed. Front margin of lateral lobes without white streak ... C. occipitalis (Thomas) SPOTTED WING GRASSHOPPER. Color plate 3. 15b.Side of tegniina without white streak. Dark spots on teguaina merge to form undulating pattern. Front mar- gin of lateral lobes with white streak extending into dark band ... C. crenulata (Bruner) CRENULATED GRASSHOPPER. Color plate 3. 16a. Shiny olive-green and white; lateral pronotal eadnae absent. Head not pointed; hind wing clear. Eyes reddish brown; often with reddish brown on metazona and coxae. Desert species found on creosotebush ... Bootettix argentatus Bruner CREOSOTE BUSH GRASSHOPPER. Color plate 2. 16b. Not shiny green and white. Pronotum variable.. 17 17a. Front of head pointed (Fig. 90). Body hairy. Body color green, brown, or gray; often spotted with black a"or white             ... Acrolophitus      .............................................. 18 17b. Not fitting above description            .................... 19 18a. Pronomm with high arching crest (Fig. 94). Body mostly green, spotted or unspotted. Hind wings greenish yellow with broad black band ... A. hirtipes (Say) GREEN FOOL GRASSHOPPER. Color plate 1.