OTOPTERUS. 653 
36.8; fifth finger, metacarpal, 40.6; tibia, 21.5; foot, 12.7; ear, 30.5; 
tragus, 11.4. Skull: occipito-nasal length, 23; zygomatic width, 12; 
height of braincase, 9.5; interorbital constriction, 4; palatal length, ro; 
postpalatal length, 8; mastoid breadth, 11; length of upper molar 
series, 8; length of mandible, 17; lower molar series, 9.5. 
615. mexicanus (acrotus), Sauss., Rev. Mag. Zo6dl., 2me Sér., x11, 
1860, p. 486. 
SAUSSURE’S LARGE-EARED Bat. 
Type locality. District of Yautepec, near Cuautla, State of 
Morelos, Mexico. 
Geogr. Distr. Tres Marias Islands, State of Jalisco, south to 
States of Mexico and Oaxaca, Mexico. 
Genl. Char. Similar in size to O. waterhousi and O. bocourtianus, 
but paler in color; deep groove on side of face beneath eye; ears very 
large, longer than head; outer margin of ear conch convex, rounded 
above and with a notch opposite tragus; tragus twice as long as broad, 
pointed; under lip grooved; nose-leaf small, placed at end of muzzle. 
Color. Above dark grayish brown, basal position of fur white; 
beneath gray tinged with rufous; membranes and ears pale brown. 
Measurements. Length of forearm, 50; thumb, 8.8; third finger, 
metacarpal, 39; fourth finger, metacarpal, 36; fifth finger, meta- 
Gatpal, Ao: tibia, 21/5- foot, 12.4; ear, 30; tragus, 11.4; tail vertebre, 
26.4. Skull: occipito-nasal length, 21; zygomatic width, 12; inter- 
orbital width, 4; height of braincase, 8; palatal length, 11; length of 
mandible, 16. 
616. californicus (Macrotus), Baird, Proc. Acad. Nat. Scien. Phil., 
1858, p. 116. Elliot, Syn. N. Am. Mamm., 1901, p. 420. 
CALIFORNIA LARGE-EARED Bart. : 
Type locality. Old Fort Yuma, San Diego County, California. 
Geogr. Distr. Lower California probably (obtained near the bor- 
der), into southern California. 
Genl. Char. Similar to O.waterhousi Gray. Auricle longer 
than head; basal lobes developed; nose-leaf with defined lower bor- 
der; internal border of tragus thickened, and revoluted portion at 
base of external border swollen; lower lip grooved with a small wart 
on each side of the groove; fur bicolor. 
Color. Above and below gray, base of fur white, terminal third 
fawn. 
Measurements. Total length, 104; tail vertebre, 38; tibia, 21; 
foot, 12.7; forearm, 50.8; longest finger, 36; height of ear, 27.9; tragus, 
10.6. Skull: occipito-nasal length, 20.5; zygomatic width, 12; 
