Moure, 1943 : 463 Augochlora clonia Brèthes, 1909 Ceratalictus Ceratalictus Ceratalictus Pereirapis Augochlorella Ceratalictus Augochlora Augochlora A taxonomic revision of the augochlorine bee genus Ceratalictus Moure (Hymenoptera, Apoidea) Coelho, Beatriz W. T. Gonçalves, Rodrigo B. Zootaxa 2010 2675 1 25 3KP6 Moure, 1943 Moure 1943 [151,462,1946,1972] Insecta Halictidae Ceratalictus Animalia Hymenoptera 1 2 Arthropoda genus     Ceratalictus  Moure, 1943: 463. Typespecies: Oxystoglossa theia Schrottky, 1910(=  Augochlora clonia Brèthes, 1909) by original designation.   Ceratalictus; generic diagnosis, Eickwort (1969).  Ceratalictus; generic diagnosis, Engel (2000).   Ceratalictuswas described by Moure (1943)in an identification key, in order to accommodate the male of Oxystoglossa theia.The following features were listed by Moure to separate this species from  Pereirapisand Oxystoglossidiaspecies (currently a junior synonym of  Augochlorella): clypeal apex without yellow band, rounded gena, and F2 equal to or shorter than F3. Subsequent descriptions detailing important morphological traits were provided by Eickwort (1969)and Engel (2000). Here, we follow the diagnosis for  Ceratalictus(relative to other genera of the Augochloragroup) and description provided by Engel (2000), except for some additions ( in italics). According to previous phylogenetic analyses ( Eickwort 1969; Danforth & Eickwort 1997; Engel 2000), the genus is part of the Augochloragenus-group, for which females can be diagnosed by the combination of inner hind tibial spur serrate and preoccipital ridge carinate, males of this group are difficult to diagnose by external morphology.   Diagnosis.  Ceratalictuscan be distinguished from  Augochlora,  Augochlorella, and  Pereirapis(the genera belonging to the Augochloragroup) by the male and female epistomal sulcus forming an obtuse angle and body punctation relatively strong and coarse(as in Figs. 8, 18, 24), in combination with the following female characters: inner hind tibial spur tooth widely separated, and without basal expansion(see Eickwort 1969: 464, fig. 215); basitibial plate in female with anterior border poorly defined; and the following male characters: pale apical band on clypeus absent; ventral surface of male hind tibia with long erect setae, its length varying from 2/3 to equal the tibial width; and conspicuous parapenial lobe( Fig. 1).   Description. Total body length 5–9 mm. General color of body usually bright metallic green, sometimes with some bluish or reddish highlights. Body punctation strong and coarse. Female. Labral distal process narrowly triangular; basal elevation usually restricted to apical part. Preoccipital ridge carinate or lamellate. Lateral angle of pronotum obtuse or acute to strongly acute and projected. Inner hind tibial spur serrate, teeth widely separated, basal part not raised. Male. Apical margin of clypeus without pale apical band. Ven tr a l surface of hind tibia with a row of long erect setae, its length varying from two-thirds to equal to tibial width.Apical margin of S8 with or without median process. Point of fusion between S7 and S8 before apodeme apex. Parapenial lobe present, relatively long; ventral process of gonostylus formed by two lobes; inner lobe of ventral process not divided.   Comments.Some characters deserve attention for being distinctively variant in some species of  Ceratalictusin comparison to others: labrum with basal elevation transverse and occupying the whole sclerite occurs only in  Ceratalictus clonius; the preoccipital ridge is strongly lamellate in  C. stigon; the lateral angle of pronotum is obtuse in  C. camargoi, C. cloniusand  C. psoraspis; only the male of  Ceratalictus allostictushas setae on the ventral surface of the hind tibia longer than the diameter of tibia; and  Ceratalictus argentinus,  C. camargoi, and  C. cloniushave S8 without median process on the apical margin. Finally, the obsolete anterior border of the basitibial plate cited by Eickwort (1969)and Engel (2000)can be found in some species of  Augochlorellaand is not considered here as a characteristic of  Ceratalictus. Ten species of  Ceratalictusare herein recognized; they can be identified using the key below. A phylogeny for the species of  Ceratalictuswill await for a more thorough elucidation of the relationships among genera of the Augochloragroup. A phylogenetic study including several species of the group is currently being carried out by one of the authors (RBG), and the species recognized here form a monophyletic lineage.