An update on the distribution and nomenclature of fleas (Order Siphonaptera) of bats (Order Chiroptera) and rodents (Order Rodentia) from La Rioja Province, Argentina Author Berrizbeitia, M. Fernanda Lopez PIDBA (Programa de Investigaciones de Biodiversidad Argentina) - PCMA (Programa de Conservacion de los Murcielagos de Argentina), CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas), Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucuman, Miguel Lillo 205, (4000) Tucuman, Argentina & Fundacion Miguel Lillo mflopezberri@hotmail.com Author Sanchez, R. Tatiana PIDBA (Programa de Investigaciones de Biodiversidad Argentina) - PCMA (Programa de Conservacion de los Murcielagos de Argentina), CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas), Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucuman, Miguel Lillo 205, (4000) Tucuman, Argentina & Centro Regional de Investigaciones Cientificas y Transferencia Tecnologica (CRILAR- CONICET) Author Barquez, Ruben M. PIDBA (Programa de Investigaciones de Biodiversidad Argentina) - PCMA (Programa de Conservacion de los Murcielagos de Argentina), CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas), Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucuman, Miguel Lillo 205, (4000) Tucuman, Argentina Author Diaz, M. Monica https://orcid.org/0000-0001-9519-6461 PIDBA (Programa de Investigaciones de Biodiversidad Argentina) - PCMA (Programa de Conservacion de los Murcielagos de Argentina), CONICET (Consejo Nacional de Investigaciones Cientificas y Tecnicas), Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucuman, Miguel Lillo 205, (4000) Tucuman, Argentina & Fundacion Miguel Lillo text ZooKeys 2017 2017-06-07 678 139 154 http://dx.doi.org/10.3897/zookeys.678.12006 journal article http://dx.doi.org/10.3897/zookeys.678.12006 1313-2970-678-139 97643FD012324ABAA230241B112331C7 FFC9DC79B64AFFBD6C75603DFF8A8A76 816380 Hectopsylla (Hectopsylla) gracilis Mahnert Distribution in Argentina. Chubut, Jujuy, La Rioja, Mendoza, Neuquen , Rio Negro, and Salta ( Lopez Berrizbeitia et al. 2013 ; Lareschi et al. 2016 ). Material examined. Arauco Department : (3) 2 km S Rio de La Punta on provincial road 7 ( 28°45'28.8"S ; 66°47'09.3"W ), 996 m , G. chacoensis , 1.IX.2014 , RTS (75), 1 ♂ CMLA (600). Castro Barros Department : (7) Anillaco , behind cemetery ( 28°48'49.04"S , 66°56'0.75"W ), 1365 m Eligmodontia moreni (Thomas), 10.IX.2014 , RTS (77), 2 ♀ CMLA (601, 602); (8) 800 m E Anillaco ( 28°48.572' S ; 66°55.193' W ), 780 m , Andalgalomys olrogi Williams and Mares , 17.IV.2012 ,CML (9747), 4 ♀ CMLA (594, 595, 596, 597); G. chacoensis , 17.IV.2012 , CML (9748), 1 ♀ CMLA (593); Eligmodontia typus F. Cuvier , 18.IV.2012 , CML (9751), 2 ♀ CMLA (598, 599) ( Lopez Berrizbeitia et al. 2013 ) . Remarks. This species can be distinguished from all other species of the genus by the following characters: in males, the median lobe of distal portion of sternum IX is enlarged with a concavity at the ventral margin, the apical margin of process of clasper is straight; in females the hilla is much narrower than width of bulga, the duct of spermatheca is connecting at cribriform area of bulga on ventral apical margin and the base of metatarsal claw do not present a sinus (see Hastriter and Mendez 2000). Hectopsylla (Hectopsylla) gracilis infesting E. moreni constitutes a new flea-host association; this result was expected since H. ( H ) gracilis has been collected on Eligmodontia hirtipes and E. typus ( Lareschi et al. 2016 ). All localities correspond to the Monte Desert of Mountains and Isolated Valleys eco-region.