Small Mammals Of The Mayo River Basin In Northern Peru, With The Description Of A New Species Of Sturnira (Chiroptera: Phyllostomidae) Velazco, Paúl M. Patterson, Bruce D. Bulletin of the American Museum of Natural History 2019 2019-04-05 2019 429 1 69 45XHS (Thomas, 1882) Thomas 1882 [757,1138,513,537] Mammalia Cricetidae Neacomys Animalia Rodentia 48 48 Chordata species spinosus  IDENTIFICATION:  Neacomys spinosuswas considered the most widespread species of  Neacomys(e.g., Patton et al., 2000; Hice and Velazco, 2012; Weksler and Bonvicino, 2015a) until the taxonomy and systematics of the species was reviewed and its limits were reassessed by Hurtado and Pacheco (2017). The latter authors restricted the distribution of  N. spinosusto montane cloud forests of the Peruvian departments of Amazonas, San Martín, and Huánucoacross an elevational range that extends from 1127 to 2100 m.  Neacomys spinosusis distinguished from other congeneric species by the following combination of characteristics: dorsal fur reddish; ventral fur pale white with gray bases; carpal vibrissae short; carpal and metatarsal patches always present; tail long; supraorbital beads moderately developed; alisphenoid strut present; condylar process large and slim; procingulum of M1 anteriorly flattened; posteroloph short; and protoflexus in M1 deep ( Hurtado and Pacheco, 2017). Our specimens conform to this emended description of the species, and measurements fall within the range of size variation previously documented.  REMARKS: At Mayo River basin,  Neacomys spinosuswas captured near a small stream. Our specimens were captured at the Waqanki locality that is at an elevation of 970 m, somewhat lower than the minimum elevation ( 1127 m) previously reported for the species by Hurtado and Pacheco (2017). Lareschi and Velazco (2013)reported the mites  Gigantolaelaps intermedia,  Laelaps boultoni, and  Laelaps neacomydisfrom our specimens. MUSM, FMNH 48 48 MUSM 39280, FMNH 203672 2 2