_Skull and teeth._--Male (based on 22 adult topotypes): See measurements and plates 19-21; weight, 3.5 (2.8-4.7) grams; basilar length, 43.7 (40.0-47.7); zygomatic breadth more or less than distance between condylar foramen and M1 or than between anterior palatine foramen and anterior margin of tympanic bulla; mastoid breadth more or less than postpalatal length; postorbital breadth less than length of upper premolars and greater than width of basioccipital measured from medial margin of one foramen lacerum posterior to its opposite; interorbital breadth more or less than distance between foramen opticum and anterior margin of tympanic bullae; breadth of rostrum less (except in no. 82180) than length of tympanic bulla; least width of palate more (except in no. 81954) than length of P4; anterior margin of tympanic bulla as far posterior to foramen ovale as width of 2 to 5 upper incisors; height of tympanic bulla more or less than distance from its anterior margin to foramen ovale; length of tympanic bulla more (except in two instances) than length of lower molar and premolar tooth-row and shorter (except in two instances) than rostrum; anterior margin of masseteric fossa below m2. Female (based on 11 ad. topotypes): See measurements and plates 34-36; weight, 2.0 (1.8-2.2) grams; basilar length, 37.6 (37.0-38.9); zygomatic breadth less (except in no. 70945) than distance between condylar foramen and M1 or than between anterior palatine foramen and anterior margin of tympanic bulla; postorbital breadth less than length of upper premolars and more than width of basioccipital measured from medial margin of one foramen lacerum posterior to its opposite; least width of palate less (except in one specimen) than greatest length of P4; tympanic bulla as far posterior to foramen ovale as width of 3-1/2 to 5-1/2 upper incisors; height of tympanic bulla more or less than distance from its anterior margin to foramen ovale; length of tympanic bulla more than length of lower molar and premolar tooth-row and longer or shorter than rostrum.