Geomyphilus, Gordon and Skelley, 2007

Dellacasa, Marco, Dellacasa, Giovanni, Skelley, Paul E. & Gordon, Robert D., 2017, Systematic revision of the species of Geomyphilus (Coleoptera: Scarabaeidae: Aphodiinae) of Mexico and neighboring countries with description of a new Mexican species, Insecta Mundi 2017 (590), pp. 1-19 : 3

Key to species of Geomyphilus of Mexico (and U.S. states bordering Mexico)

1.

— Genae not protruding from the eyes. Pale reddish brown; head posteriorly and pronotum on disc more or less widely brownish. Length 4.5-6.0 mm. U.S.A. (Arkansas, Illinois, Indiana, Kansas, Louisiana, Oklahoma, Texas, Wisconsin) ............................ G. insolitus (Brown)

Genae protruding from the eyes ................................................................................................... 2

2(1).

— Elytra denticulate at shoulder ...................................................................................................... 3 Elytra not denticulate at shoulder ................................................................................................ 4 3(2).

—

Pronotum irregularly sparsely punctured, basal margin with border widely interrupted at middle but therein crenulate by a belt of coarse punctures. Piceous, clypeal margin, sides of pronotum and elytra reddish brown. Length 5.0- 5.5 mm. Mexico (Distrito Federal, México, Puebla, Tlaxcala, Veracruz) ................................................... G. pierai (Deloya and Lobo)

Pronotum almost regularly punctured, basal margin entirely bordered. Reddish brown; clypeal margin and pronotal sides paler. Length 5.0-6.0 mm. Mexico (Distrito Federal, México, Querétaro, Tlaxcala) ................................................................................. G. barrerai (Islas)

4(2).

— Clypeal margin denticulate or angulate at sides of median sinuosity ........................................ 5 Clypeal margin rounded at sides of median sinuosity ................................................................. 8

5(4).

— Clypeal margin distinctly denticulate at sides of median sinuosity ........................................... 6 Clypeal margin angulate at sides of median sinuosity ................................................................ 7 6(5).