A revision of the Larainae (Coleoptera, Elmidae) of Venezuela, with description of nine new species Author Maier, Crystal A. text ZooKeys 2013 329 33 91 http://dx.doi.org/10.3897/zookeys.329.4961 journal article http://dx.doi.org/10.3897/zookeys.329.4961 1313-2970-329-33 Pharceonus Spangler & Santiago-Fragoso, 1992 Figs 5, 8, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87 Diagnosis. The genus Pharceonus can be distinguished from all other genera of Laraine Elmidae that occur in South America by its small size and distinctive pronotum. All Pharceonus species are small (3.1-4.3 mm), but generally larger than the similar genus Phanocerus , in various shades of medium to dark brown, with a pronotum that has a distinctive transverse bisinuate impression at the apical third and a transverse, bisinuate impression subbasally (Fig. 83). These two impressions form two gibbosities on the basal two thirds of the pronotum (Fig. 83). Distribution. Pharceonus species occur throughout southern Central America and northern South America, from Costa Rica south to Peru (pers. obs.). Habitat. Members of this genus can be found on roots and woody debris in small to medium forested streams and seeps, as well as in the benthos, among gravel and sometimes on on rocky substrate ( Spangler and Santiago-Fragoso 1992 ). Figures 77-80. Pharceonus ariasi sp. n.: 77 Dorsal habitus 78 Ventral habitus 79 Lateral habitus 80 Aedeagus, dorsal and lateral views. Figures 81-84. Pharceonus grandis sp. n.: 81 Dorsal habitus 82 Ventral habitus 83 Pronotum, dorsal view 84 Aedeagus, dorsal and lateral views. Figures 85-87. Pharceonus volcanus : 85 Dorsal habitus 86 Ventral habitus 87 Pronotum, dorsal view.