Xanthocerus Mulsant & Rey, 1870, Subgenus (Berytinus) – homonym of Lizinus Mulsant & Rey, 1870, Subgenus (Berytinus)
Xanthochilus douglasi (Fieber, 1864)
Xanthochilus melanopus Kiritshenko & Scudder, 1973
Xanthochilus minusculus (Reuter, 1885)
Xanthochilus omissus (Horváth, 1911)
Xanthochilus persicellus (Kirkaldy, 1909)
Xanthochilus quadratus (Fabricius, 1798)
Xanthochilus saturnius (Rossi, 1790)
Xanthochilus turanicus (Wagner, 1961)
Xanthochilus vittiger Kiritshenko & Scudder, 1973
Xenocoris venustus Fieber, 1858 – basionym of Conostethus venustus venustus (Fieber, 1858)
Xenocorixa vittipennis (Horváth, 1879)
Xerobia verruculosa Stål, 1873
Xiphovelia boninensis Esaki & Miyamoto, 1959
Xiphovelia curvifemur Esaki & Miyamoto, 1959
Xiphovelia glauca Esaki & Miyamoto, 1959
Xiphovelia japonica Esaki & Miyamoto, 1959
Xiphoveloidea major (Poisson, 1926)
Xiphoveloidea major major (Poisson, 1927)
Xosoplax Kirkaldy, 1909, Subgenus (Deroplax)
Xylocoridea brevipennis Reuter, 1876
Xylocoris (Arrostelus) flavipes (Reuter, 1875)
Xylocoris (Arrostelus) transversus Wagner, 1954 – synonym of Xylocoris (Arrostelus) flavipes (Reuter, 1875)
Xylocoris (Lyctocoris) distinguendus Flor, 1860 – synonym of Lyctocoris (Lyctocoris) campestris (Fabricius, 1794)
Xylocoris (Proxylocoris) afer (Reuter, 1884)
Xylocoris (Proxylocoris) carayoni Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) confusus Carayon, 1972
Xylocoris (Proxylocoris) dimorphus Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) etawahii Ghauri, 1985
Xylocoris (Proxylocoris) galactinus (Fieber, 1836)
Xylocoris (Proxylocoris) halophilus Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) hiurai Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) modestus Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) mongolicus Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) nigromarginatus Carayon, 1972
Xylocoris (Proxylocoris) tesquorum Kerzhner & Elov, 1976
Xylocoris (Proxylocoris) wasmiae Ghauri, 1985
Xylocoris (Stictosynechia) lativentris (J. Sahlberg, 1870)
Xylocoris (Stictosynechia) maculipennis Baerensprung, 1858
Xylocoris (Xylocoris) altaicus Péricart, 1969
Xylocoris (Xylocoris) canariensis Wagner, 1954
Xylocoris (Xylocoris) ciliatus (Jakovlev, 1877)
Xylocoris (Xylocoris) contiguus Wagner, 1954
Xylocoris (Xylocoris) cursitans (Fallén, 1807)
Xylocoris (Xylocoris) eremius Péricart, 1974
Xylocoris (Xylocoris) formicetorum (Boheman, 1844)
Xylocoris (Xylocoris) ifniensis (Gomez-Menor Guerrero, 1956)
Xylocoris (Xylocoris) longipilis Péricart, 1972
Xylocoris (Xylocoris) machardi Péricart, 1995
Xylocoris (Xylocoris) obliquus A. Costa, 1853
Xylocoris (Xylocoris) parvulus (Reuter, 1871)
Xylocoris (Xylocoris) piceus (Reuter, 1884)
Xylocoris (Xylocoris) terricola (Reuter, 1902)
Xylocoris (Xylocoris) thomsoni (Reuter, 1883)
Xylocoris albipennis Herrich-Schaeffer, 1850 – synonym of Xylocoris (Proxylocoris) galactinus (Fieber, 1836)
Xylocoris altaicus Péricart, 1969 – basionym of Xylocoris (Xylocoris) altaicus Péricart, 1969
Xylocoris americanus Dallas, 1852 – synonym of Lyctocoris (Lyctocoris) campestris (Fabricius, 1794)
Xylocoris ater (non Dufour, 1833): – invalid name of Scoloposcelis obscurella (Zetterstedt, 1838)
Xylocoris ater Dufour, 1833 – basionym of Dufouriellus ater (Dufour, 1833)
Xylocoris balteatus Walker, 1872
Xylocoris bicolor Scholtz, 1847 – synonym of Xylocoris (Xylocoris) cursitans (Fallén, 1807)
Xylocoris cenomyces Baerensprung, 1858 – synonym of Xylocoris (Xylocoris) formicetorum (Boheman, 1844)
Xylocoris constrictus Stål, 1860 – basionym of Amphiareus constrictus (Stål, 1860)
Xylocoris contiguus Wagner, 1954 – basionym of Xylocoris (Xylocoris) contiguus Wagner, 1954
Xylocoris crassipes Flor, 1860 – synonym of Scoloposcelis pulchella pulchella (Zetterstedt, 1838)
Xylocoris cursitans (non Fallén, 1807): – invalid name of Xylocoris (Xylocoris) formicetorum (Boheman, 1844)
Xylocoris deserti Villiers, 1956 – synonym of Xylocoris (Proxylocoris) galactinus (Fieber, 1836)
Xylocoris dimidiatus Spinola, 1837 – basionym of Lyctocoris (Lyctocoris) dimidiatus (Spinola, 1837)
Xylocoris Dufour, 1831, Subgenus (Xylocoris)
Xylocoris ferrugineus R.F. Sahlberg, 1848 – synonym of Scoloposcelis obscurella (Zetterstedt, 1838)
Xylocoris formiceticola R.F. Sahlberg, 1848 – synonym of Xylocoris (Xylocoris) formicetorum (Boheman, 1844)
Xylocoris formicetorum Baerensprung, 1858 – synonym of Xylocoris (Xylocoris) formicetorum (Boheman, 1844)
Xylocoris fulvescens Walker, 1873 – synonym of Amphiareus constrictus (Stål, 1860)
Xylocoris heluanensis Wagner, 1961 – synonym of Xylocoris (Xylocoris) obliquus A. Costa, 1853
Xylocoris ifniensis euphorbiae Péricart, 1972 – synonym of Xylocoris (Xylocoris) ifniensis (Gomez-Menor Guerrero, 1956)
Xylocoris latior latior Mulsant & Rey, 1852 – synonym of Xylocoris (Xylocoris) cursitans (Fallén, 1807)
Xylocoris latus Walker, 1872 – synonym of Lyctocoris (Lyctocoris) campestris (Fabricius, 1794)
Xylocoris longipilis Péricart, 1972 – basionym of Xylocoris (Xylocoris) longipilis Péricart, 1972
Xylocoris maculipennis Baerensprung, 1858 – basionym of Xylocoris (Stictosynechia) maculipennis Baerensprung, 1858
Xylocoris obliquus A. Costa, 1853 – basionym of Xylocoris (Xylocoris) obliquus A. Costa, 1853
Xylocoris palmi Gyllensvärd, 1968 – synonym of Xylocoris (Proxylocoris) galactinus (Fieber, 1836)
Xylocoris parisiensis Amyot & Serville, 1843 – synonym of Lyctocoris (Lyctocoris) dimidiatus (Spinola, 1837)
Xylocoris rogeri (non Baerensprung, 1858): – invalid name of Xylocoris (Stictosynechia) lativentris (J. Sahlberg, 1870)
Xylocoris rogeri Baerensprung, 1858 – synonym of Xylocoris (Xylocoris) cursitans (Fallén, 1807)
Xylocoris rufipennis Dufour, 1833 – synonym of Xylocoris (Xylocoris) cursitans (Fallén, 1807)
Xyloecocoris ovatulus Reuter, 1879
Xylonannus Reuter, 1891, Subgenus (Ceratocombus)