Key to genera of Pharaxonothinae (modified from Leschen 2003 and Xu et al. 2015)

1 Antennal club of 2 antennomeres.......................................................... Setariola Jacobson

- Antennal club of 3 antennomeres......................................................................... 2

2 Pronotal callosities present; vestiture of scale-like setae................................ Leucohimatium Rosenhauer

- Pronotal callosities absent; vestiture of simple setae.......................................................... 3

3 Eyes small, ventrally not encroaching upon gular area, distance between eye and lateral corner of mentum about equal to length of eye in ventral view; not associated with cycads...................................................... 4

- Eyes large, ventrally encroaching upon gular area, distance between eye and lateral corner of mentum <1/2 eye length in ventral view; most associated with cycads..................................................................... 5

4 Dorsal punctation strong and impressed.................................................... Henoticonus Reitter

- Dorsal punctation weak and not strongly impressed......................................... Loberogosmus Reitter

5 Submental-gular suture visible as depressed darkened area, often with row of punctures and setae; anterior pronotal margin of most with fine, distinct, complete marginal line; male genitalia with median lobe and tegmen laterally flattened and slightly to strongly twisted (at least basally); spiculum gastrale asymmetrical; Asia............... Cycadophila Xu, Tang & Skelley

- Submental-gular suture apparently lacking, surface flattened; anterior pronotal margin lacking marginal line, some with row of fine punctures; male genitalia with median lobe cylindrical and tegmen dorsoventrally or laterally flattened, but usually not twisted; spiculum gastrale symmetrical; Americas............................................................ 6

6 Lateral pronotal carina thicker anteriorly in lateral view (Figs. 1 D–E); head with supraocular lines and elytra lacking basal bead; stridulatory file at base of head separated by distance ~ 0.5× width of the scutellar shield (Fig. 1B); tarsomeres I–III distinctly widened (Figs. 4 D–E, 8F), metatarsomere I width ± length; male genitalia with median lobe arched in lateral view; flagellum length Ĺ length of median lobe and not coiled (Figs. 4G, 5F, 6H, 7G, 8G); Mexico and probably Belize, Guatemala and Honduras on Ceratozamia ............................................................ Ceratophila, new genus

- Lateral pronotal carina narrow, same thickness along entire length in lateral view (Fig. 1C); head without supraocular lines and elytra with distinct basal bead (Fig. 1A; P . esperanzae Chaves and Genaro is the exception); stridulatory files at base of head separated by distance ~ width of scutellar shield (Fig. 1A); tarsomeres I–III narrow, metatarsomere I length always distinctly greater than width; male genitalia with median lobe straight; flagellum length >> length of median lobe and coiled; widespread New World on Ceratozamia, Dioon, Microcycas, Zamia ..................................... Pharaxonotha Reitter