The genus Cephalocyclus Dellacasa M., Gordon & Dellacasa G. is revised for the first time. Ten new species are described: Cephalocyclus bordati, C. carmenae, C. cartagoensis, C. costaricensis, C. halffteri, C. howdenorum, C. lagoi, C. ordonezi, C. potosinus, and C. rockefelleri. Aphodius luteolus Horn, 1887 is transferred into genus Cephalocyclus; Aphodius pugil Balthasar, 1946 resulted a junior synonym of Cephalocyclus durangoensis (Bates, 1887) and Aphodius transversus Robinson, 1940 resulted a junior synonym of Cephalocyclus hogei (Bates, 1887). A key to the presently known 21 species of Cephalocyclus as well as descriptions and illustrations of all taxa are supplied.

El género Cephalocyclus Dellacasa M., Gordon & Dellacasa G. es revisado por primera vez. Se describen diez nuevas especies: bordati, C. carmenae, C. cartagoensis, C. costaricensis, C. halffteri, C. howdenorum, C. lagoi, C. ordonezi, C. potosinus, and C. rockefelleri. Aphodius luteolus Horn, 1887 es transferido al género Cephalocyclus; Aphodius pugil Balthasar, 1946 resulta ser una sinonimia menor de Cephalocyclus durangoensis (Bates, 1887) y Aphodius transversus Robinson, 1940 resultó una sinonimia menor de Cephalocyclus hogei (Bates,1887). Se presenta una elave para las 21 especies conocidas de Cephalocyclus así como las descripciones e ilustraciones de todos los taxones.

Coccinellidae (Coleoptera) da América do Sul. Parte X: Revisão sistemática de Thalassa Mulsant (Hyperaspidinae). O gênero Thalassa Mulsant, 1850 é revisado. Suas cinco espécies são redescritas: T. pentaspilota (Chevrolat, 1853), T. flaviceps Mulsant, 1850, T. similaris Mulsant, 1850, T. montezumae Mulsant, 1850 e T. glauca (Mulsant, 1850). Uma nova espécie é proposta, Thalassa korschefskyi sp. nov., da Colômbia. São fornecidas ilustrações e chave para as espécies. O lectótipo de Thalassa reyi Mulsant, 1850 é aqui designado.

The genus Thalassa Mulsant, 1850 is revised. Its five species are redescribed: T. pentaspilota (Chevrolat, 1853), T. flaviceps Mulsant, 1850, T. similaris Mulsant, 1850, T. montezumae Mulsant, 1850, and T. glauca (Mulsant, 1850). A new species is proposed, Thalassa korschefskyi sp.nov., from Colombia. The species are illustrated and a key to species is also provided. Lectotype of Thalassa reyi Mulsant, 1850 is here designated.

Species of Aphodius described or recorded by Bates (1887, 1889) in the Biologia Centrali-Americana are discussed, resulting in some new combinations or new status as follows: Aphodius dugesi Bates, 1887 = Diapterna dugesi (Bates, 1887) n. comb.; Aphodius sallei Harold, 1863 = Agrilinus sallei (Harold, 1863) n. comb.; Aphodius lansbergei Harold, 1874 = Agrilinus lansbergei (Harold, 1874) n. comb.; Aphodius indutilis Harold, 1874 = Agrilinus indutilis (Harold, 1874) n. comb.; Aphodius azteca Harold, 1863 = Agrilinus (s. l.) azteca (Harold, 1863) n. comb.; Aphodius oleosus Harold, 1871 = Pharaphodius (s. l.) oleosus (Harold, 1871) n. comb.; Aphodius innexus Say, 1835 = Liothorax innexus (Say, 1835) n. comb.; Aphodius cruentatus LeConte, 1878 = Agoliinus (s. l.) cruentatus (LeConte, 1878) n. comb.; Aphodius glyptus Bates, 1887 = Trichonotuloides glyptus (Bates, 1887) n. comb.; Aphodius latecrenatus Bates, 1887 = Trichonotuloides latecrenatus (Bates, 1887) n. comb.; Aphodius euprosopus Bates, 1887 = Agrilinus (s. l.) azteca ab. euprosopus (Bates, 1887) n. stat. and n. comb.; Aphodius constricticollis Bates, 1889 = Imelda constricticollis (Bates, 1889) n. comb.; Aphodius opisthius Bates, 1887 (new name for Aphodius duplex Bates, 1887) = Gonaphodiellus opisthius (Bates, 1887) n. comb.; Aphodius panamensis Harold, 1859 = Aidophus panamensis (Harold, 1859) n. comb. [Didactyliini]; Aphodius guatemalensis Bates, 1887 = Blackburneus (s. l.) guatemalensis (Bates, 1887) n. comb.; Aphodius guatemalensis var. scotinus Bates, 1887 = Blackburneus (s. l.) guatemalensis ab. scotinus (Bates, 1887) n. comb.; Aphodius guatemalensis var. chiriquinus Bates, 1887 = Blackburneus (s. l.) guatemalensis ab. chiriquinus (Bates, 1887) n. comb.; Aphodius charmionus Bates, 1887 = Blackburneus (s. l.) charmionus (Bates, 1887) n. comb.; Aphodius diminutus Bates, 1887 = Blackburneus (s. l.) diminutus (Bates, 1887) n. comb.; Aphodius erythrinus Bates, 1887 = Blackburneus (s. l.) erythrinus (Bates, 1887) n. comb.; Aphodius xanthus Bates, 1887 = Blackburneus (s. l.) xanthus (Bates, 1887) n. comb.; Aphodius larreae Horn, 1887 (senior synonym of Aphodius bifrons Bates, 1887) = Drepanocanthoides larreae (Horn, 1887) n. comb.; Aphodius hogei Bates, 1887 = Cephalocyclus hogei (Bates, 1887) n. comb.; Aphodius hogei var. durangoensis Bates, 1887 = Cephalocyclus durangoensis (Bates, 1887) n. stat. and n. comb. Moreover, the new combination for Aphodius pseudolividus Balthasar, 1941 is Labarrus pseudolividus (Balthasar, 1941). The new genus Imelda is described with Aphodius constricticollis as the type species. Aphodius (Trichonotuloides) fossulatipennis Balthasar, 1945 is considered a junior synonym of Trichonotuloides latecrenatus (Bates, 1887); and Aphodius omiltemius Bates, 1889 is placed as a junior synonym of Cephalocyclus mexicanus (Harold, 1862). Lectotypes and paralectotypes are designated where necessary.

Las especies de Aphodius descritas o registradas por Bates (1887, 1889) en la Biologia Centrali-Americana son discutidas, resultando algunas combinaciones nuevas o status nuevos como sigue: Aphodius dugesi Bates, 1887 = Diapterna dugesi (Bates, 1887) comb. n.; Aphodius sallei Harold, 1863 = Agrilinus sallei (Harold, 1863) comb. n.; Aphodius lansbergei Harold, 1874 = Agrilinus lansbergei (Harold, 1874) comb. n.; Aphodius indutilis Harold, 1874 = Agrilinus indutilis (Harold, 1874) comb. n.; Aphodius azteca Harold, 1863 = Agrilinus (s. l.) azteca (Harold, 1863) comb. n.; Aphodius oleosus Harold, 1871 = Pharaphodius (s. l.) oleosus (Harold, 1871) comb. n.; Aphodius innexus Say, 1835 = Liothorax innexus (Say, 1835) comb. n.; Aphodius cruentatus LeConte, 1878 = Agoliinus (s. l.) cruentatus (LeConte, 1878) comb. n.; Aphodius glyptus Bates, 1887 = Trichonotuloides glyptus (Bates, 1887) comb. n.; Aphodius latecrenatus Bates, 1887 = Trichonotuloides latecrenatus (Bates, 1887) comb. n.; Aphodius euprosopus Bates, 1887 = Agrilinus (s. l.) azteca ab. euprosopus (Bates, 1887) stat. n. y comb. n.; Aphodius constricticollis Bates, 1889 = Imelda constricticollis (Bates, 1889) comb. n.; Aphodius opisthius Bates, 1887 (nuevo nombre para Aphodius duplex Bates, 1887) = Gonaphodiellus opisthius (Bates, 1887) comb. n.; Aphodius panamensis Harold, 1859 = Aidophus panamensis (Harold, 1859) comb. n. [Didactyliini]; Aphodius guatemalensis Bates, 1887 = Blackburneus (s. l.) guatemalensis (Bates, 1887) comb. n.; Aphodius guatemalensis var. scotinus Bates, 1887 = Blackburneus (s. l.) guatemalensis ab. scotinus (Bates, 1887) comb. n.; Aphodius guatemalensis var. chiriquinus Bates, 1887 = Blackburneus (s. l.) guatemalensis ab. chiriquinus (Bates, 1887) comb. n.; Aphodius charmionus Bates, 1887 = Blackburneus (s. l.) charmionus (Bates, 1887) comb. n.; Aphodius diminutus Bates, 1887 = Blackburneus (s. l.) diminutus (Bates, 1887) comb. n.; Aphodius erythrinus Bates, 1887 = Blackburneus (s. l.) erythrinus (Bates, 1887) comb. n.; Aphodius xanthus Bates, 1887 = Blackburneus (s. l.) xanthus (Bates, 1887) comb. n.; Aphodius larreae Horn, 1887 (sinonimia major de Aphodius bifrons Bates, 1887) = Drepanocanthoides larreae (Horn, 1887) comb. n.; Aphodius hogei Bates, 1887 = Cephalocyclus hogei (Bates, 1887) comb. n.; Aphodius hogei var. durangoensis Bates, 1887 = Cephalocyclus durangoensis (Bates, 1887) stat. n. y comb. n. Además para Aphodius pseudolividus Balthasar, 1941 se establece la combinación nueva Labarrus pseudolividus (Balthasar, 1941). El género nuevo Imelda se describe con Aphodius constricticollis como especie tipo. Aphodius (Trichonotuloides) fossulatipennis Balthasar, 1945 es considerada como sinonimia minor de Trichonotuloides latecrenatus (Bates, 1887); y Aphodius omiltemius Bates, 1889 es colocada como sinonimia minor de Cephalocyclus mexicanus (Harold, 1862). Se designan lectotipos y paralectotipos cuando es necesario.

The lectotype of Aphodius (Platyderides) pullatus A. Schmidt, 1913 is designated, the new combination is established and the redescription, supported by iconographical coverage, is supplied. A peculiar character of male Cephalocyclus mexicanus (Harold, 1863), is recorded. The new synonymy of Aphodius (Agrilinus) freyi Balthasar, 1941 versus Aphodius sallei Harold, 1863 is ascertained on the basis of study of the types.

Se designa y dibuja el lectotipo de Aphodius (Platyderides) pullatus A. Schmidt, 1913, estableciendo una nueva combinación y presentando la redescripción apoyada en un soporte iconográfico. Se registra un caracter distintivo del macho de Cephalocyclus mexicanus (Harold, 1863). Aphodius (Agrilinus) freyi Balthasar, 1941 es sinónimo de Aphodius sallei Harold, 1863.