Omorgus (Haroldomorgus) batesi (Harold, 1872)
Omorgus (Omorgus) asper Leconte, 1854
Omorgus (Omorgus) badeni (Harold, 1872)
Omorgus (Omorgus) borrei (Harold, 1872)
Omorgus (Omorgus) candezei Harold, 1872
Omorgus (Omorgus) capillaceus Scholtz, 1990:1413
Omorgus (Omorgus) carinatus Loomis, 1922
Omorgus (Omorgus) ciliatus (Blanchard in d'Orbigny, 1846:190)
Omorgus (Omorgus) fulginosus (Robinson, 1941)
Omorgus (Omorgus) howelli Howden & Vaurie, 1957 (= Trox howelli Howden & Vaurie, 1957 [Florida, Texas])
Omorgus (Omorgus) indigenus Scholtz, 1990:1411
Omorgus (Omorgus) inflatus Loomis, 1922
Omorgus (Omorgus) loxus (Vaurie, 1955:58)
Omorgus (Omorgus) mictlensis Deloya, 1995:153
Omorgus (Omorgus) monachus (Herbst in Jablonsky, 1790:25)
Omorgus (Omorgus) nocheles Scholtz, 1990:1412
Omorgus (Omorgus) nodosus (Robinson, 1940) (= Omorgus nodosus Robinson, 1940:152 [Texas, New Mexico])
Omorgus (Omorgus) pastillarius (Blanchard in d'Orbigny, 1846:187)
Omorgus (Omorgus) persuberosus (Vaurie, 1962:145)
Omorgus (Omorgus) punctatus (Germar, 1824)
Omorgus (Omorgus) rodriguezae Deloya, 2005:121
Omorgus (Omorgus) rubricans (Robinson, 1946)
Omorgus (Omorgus) scabrosus (Beauvois, 1809) [Omorgus scabrosus (Palisot de Beauvois, 1805:175) Canada, Ontario, Kansas, Oklahoma, New York, Kentucky, Florida, Texas, Nebraska, South Carolina, Colorado]
[=Trox scabrosus Palisot de Beauvois, 1805]
Omorgus (Omorgus) scutellaris (Say, 1823:238)
Omorgus (Omorgus) spatulatus (Vaurie, 1962:151)
Omorgus (Omorgus) suberosus (Fabricius, 1775:31)
Omorgus (Omorgus) tessellatus Leconte, 1854
Omorgus (Omorgus) texanus (LeConte, 1854) [Omorgus texanus Leconte, 1854 [Texas]
[=Trox oligonus Loomis, 1922]
[=Omorgus suturalis Leconte, 1854]
Omorgus (Omorgus) tomentosus Robinson, 1941
Omorgus (Omorgus) umbonatus (LeConte, 1854) [Omorgus umbonatus Leconte, 1854 [Texas]
[= Omorgus confluentus Robinson, 1941]
[=Trox platycyphus Loomis, 1922] [syn. Robinson 1940 p. 150]
Polynoncus aeger (Guerin-Meneville, 1844:85)
Polynoncus aricensis (Gutiérrez, 1950)
Polynoncus bifurcatus (Vaurie, 1962:129)
Polynoncus brasiliensis (Vaurie, 1962:134)
Polynoncus brevicollis (Eschscholtz, 1822:12)
Polynoncus bullatus (Curtis, 1845:197)
Polynoncus burmeisteri Pittino, 1987:380
Polynoncus chilensis (Harold, 1872)
Polynoncus diffluens (Vaurie, 1962:138)
Polynoncus ecuadorensis (Vaurie, 1962:133)
Polynoncus erugatus Scholtz, 1990:1425
Polynoncus galapagoensis (Van Dyke, 1953)
Polynoncus gemmifer Blanchard in d'Orbigny, 1846:187
Polynoncus gemmingeri (Harold, 1872)
Polynoncus gibberosus Scholtz, 1990:1428
Polynoncus gordoni (Steiner, 1981:205)
Polynoncus guttifer (Harold, 1868)
Polynoncus haafi (Vaurie, 1962:122)
Polynoncus hemisphaericus (Burmeister, 1876)
Polynoncus juglans (Ratcliffe, 1978:299)
Polynoncus longitarsis (Harold, 1872)
Polynoncus mirabilis Pittino, 1987:391
Polynoncus neuquen (Vaurie, 1962:123)
Polynoncus pampeanus (Burmeister, 1876)
Polynoncus parafurcatus Pittino, 1987:395
Polynoncus patagonicus (Blanchard, 1846:186)
Polynoncus patriciae Pittino, 1987:386
Polynoncus pedestris (Harold, 1872)
Polynoncus peruanus (Erichson, 1847:111)
Polynoncus pilularius (Germar, 1824:113)
Polynoncus sallei (Harold, 1872)
Polynoncus seymourensis (Mutchler, 1925)
Polynoncus tenebrosus (Harold, 1872)
Trox (Trox) acanthinus Harold, 1872
Trox (Trox) aequalis Say, 1831:5
Trox (Trox) atrox LeConte, 1854 [Trox atrox Leconte, 1854 [Nebraska, Massachusetts, New York, Pennsylvania, Iowa, Arkansas, Maryland, Texas]
Trox (Trox) insularis Chevrolat, 1864
Trox (Trox) plicatus Robinson, 1940 [Trox plicatus Robinson, 1940:153 [Arizona, Texas]
Trox (Trox) scabra (Linnaeus, 1767:573)
Trox (Trox) spinulosus dentibius Robinson, 1940:156
Trox (Trox) torpidus Harold, 1872
Trox (Trox) variolatus Melscheimer, 1846 [Trox variolatus Melsheimer, 1844:137 [Mexico, Texas, Kansas, South Carolina, Nebraska, Oklahoma, Iowa, Pennsylvania, Kentucky, Vermont, Canada][= Trox erinaceus Leconte, 1854] [syn. Robinson 1940 p. 151]
[= Trox monticola Robinson, 1940:158] [as sub