The mammals of Paracou, French Guiana, a Neotropical lowland rainforest fauna. Part 1, Bats Author Simmons, Nancy B. Department of Mammalogy, American Museum of Natural History, New York, NY, USA Author Voss, Robert S. Department of Mammalogy, American Museum of Natural History, New York, NY, USA text Bulletin of the American Museum of Natural History 1998 1998-12-31 237 1 219 journal article 8160 10.5281/zenodo.4545052 0540f87c-c902-4df5-acd4-51801c9531bd 2246/1634/B237-0004 4545052 Micronycteris schmidtorum Sanborn VOUCHER MATERIAL: 2 males (AMNH *267853; MNHN *1995.818); see table 25 for measurements. IDENTIFICATION: Characters distinguishing Micronycteris schmidtorm from other congeneric species were summarized in the preceding account for M . brosseti and will not be repeated here. Ascorra et al. (1991a) reviewed M . schmidtorum but referred some specimens to this species that we subsequent­ ly reidentified as either M . sanborni (Simmons, 1996b) or M . brosseti (see above). Simmons (1996b) provided a summary of measurements of Micronycteris schmidtorum sensu stricto from throughout its known geographic range. No subspecies are currently recognized (Simmons, 1996b). Fig. 33. Roost of Micronycteris microtis and Carollia perspicillata in a partially rotted buttress of the large tree shown in figure 3. From the upper edge of the opening visible in this view (arrow), a dark chamber extended upward less than a meter. In 1991 this small cavity contained 13–14 bats, of which 8 M . microtis and 2 C . perspicillata were captured; 3–4 unidentified bats escaped. This roost was not revisited in subsequent years. Although our voucher material generally agrees with previous descriptions of Micronycteris schmidtorum , Paracou specimens have pale gray ventral fur rather than the pale buff venters seen in specimens from other localities. Because we did not find any other consistent differences, and because other congeners with pale ventral fur (e.g., M . brosseti and M . minuta ) exhibit similar chromatic variability, we conclude that this represents normal intraspecific variation. In addition to characters discussed previously, we found that tibia length was helpful for distinguishing Micronycteris schmidtorum from sympatric species in the hand, at least at Paracou. Whereas both M . schmidtorum and M . homezi have long tibias (15.3– 15.8 mm), the lower leg is consistently short­ er (12.8–14.6 mm) in M . brosseti , M . megalotis , M . microtis , and M . minuta . FIELD OBSERVATIONS: Our two examples of Micronycteris schmidtorum were both taken in ground­level mistnets in well­drained primary forest.