Table 3. Differences in coloration, scale counts, and size between Atractus arangoi and A. major. The range of each continuous variable is from our own sample, Prado (1939), and Maynard et al. (2017). The numbers in parentheses represent the sample size. Variable characterAtractus arangoiAtractus majorDark brown or black nape stripeAbsentPresentDorsal markingsIrregular dark blotchesComplete irregular dark bands anteriorly; blotches posteriorlySexMales (n = 2)Females (n = 2)Males (n = 7)Females (n = 5)Maximum SVL309 mm412 mm533 mm986 mmVentral scales154-163160-161162-165172-177Subcaudal scales38-3929-3236-4534-37

Published as part of Arteaga, Alejandro, Quezada, Amanda, Vieira, Jose & Guayasamin, Juan M., 2022, Leaving no stone unturned: three additional new species of Atractus ground snakes (Serpentes, Colubridae) from Ecuador discovered using a biogeographical approach, pp. 175 in ZooKeys 1121 on page 175, DOI: 10.3897/zookeys.1121.89539