Key to species of Pantomorus albosignatus species group

1 Eyes slightly to moderately protruding; pronotum subcylindrical, disc feebly punctate, posterior margin straight to slightly curved, not to feebly beveled, posterolateral angles not produced; elytra moderately short, apical declivity feeble to moderately abrupt.............................................................................................. 2

- Eyes strongly protruding; pronotum truncate-conical, disc strongly punctate, posterior margin slightly bisinuate and beveled, posterolateral angles produced, directed outwards; elytra short and broad, apical declivity strongly abrupt................................................................. Pantomorus andersoni sp. n. (Figs. 3, 6, 8) (Mexico: Guerrero)

2 Elytra lacking humeri; antennae usually broad, funicle segment 2 equal to slightly longer than segment 1; vestiture usually with characteristic pattern of whitish interrupted stripes or maculae on elytra; endophallus without sclerites.................. 3

- Elytra with vestigial humeri; antennae slender; funicle segment 2 twice as long as segment 1; vestiture usually uniform and lacking characteristic pattern, except for a paler stripe along suture of elytra; endophallus with sclerites.................................................................................. Pantomorus crinitus (Boheman) (Figs. 9–14) (El Salvador, Guatemala and Mexico: Chiapas, Oaxaca and Veracruz)

3 Eyes moderately protruding; antennae stout; funicle segment 2 about as long as segment 1; base of elytra thickened; disc of elytra strongly convex and much wider relative to maximum width of pronotum (WE/WP 1.50–1.60× in females); apex of elytra rounded; apical declivity moderately abrupt; sides of pronotum slightly curved in both sexes...................................................................................... Pantomorus albosignatus Boheman (Figs. 1, 4, 7) (Mexico: Aguascalientes, Chihuahua, Coahuila, Durango, Federal District, Guanajuato, Hidalgo, Nuevo León, Oaxaca, Puebla, Querétaro, San Luis Potos, Veracruz and Zacatecas) .

- Eyes slightly protruding; antennae slender, funicle segment 2 longer than segment 1; base of elytra not thickened; disc of elytra moderately convex and less wider relative to maximum width of pronotum (WE/WP 1.30–1.40×); apex of elytra subacute; apical declivity feeble; sides of pronotum moderately to strongly curved in males................................................................................ Pantomorus parvulus Sharp (Figs. 2, 5) (Mexico: Oaxaca and Veracruz)