Revision of the subgenus Calloesma Michener (Apoidea : Colletidae)

The subgenus Callohesma Michener, 1965, of the genus Euryglossa Smith, 1853, is revised. Thirty-four species are recognized including 20 which are described as new: E. ( C .) eustonensis, E. ( C .) karratha, E. ( C .) chlora, E. ( C .) megachlora, E. ( C .) matthewsi, E. ( C .) splendens, E. ( C .) coolgardensis, E. ( C .) nigripicta, E. ( C .) tuberculata, E. ( C .) rieki, E. ( C .) setula, E. ( C .) skermani, E. ( C .) albiceris, E. ( C .) queenslandensis, E. ( C .) pedalis, E. ( C .) townsvillensis, E. ( C .) occidentalis, E. ( C .) lucida, E. ( C .) flava and E. ( C .) recta . Most species have been redescribed. The following are considered to be synonyms: E. carnosa Cockerell, E. sinapina Cockerell and E. melanothorax Rayment of E. sinapipes Cockerell; E. cambournii Rayment of E. aurantifera Cockerell; E. tridentijrons Cockerell, E. strigosa Rayment and E. raffae Rayment of E. fivopicta Smith. Keys and line drawings that enable the separation of all species are presented.