Artibeus planirostris, Dobson, Catal. Chiroptera, British Mus., p. 515 (part), 1878.
Range.—Probably southwestern part of state.
Specimen examined, 1: no. 945b B. Villa R., field no., I.B., El Guayabo, 34 kms. S Uruapan.
Measurements.—Head and body, 89.0 mm.; total length of skull to front of upper canines, 28.0; mastoid breadth, 15.5; zygomatic breadth, 17.8; maxillary width across first upper molars, 13.2; breadth across cingula of upper canines, 7.9; greatest length of one ramus of lower jaw including anteriormost incisor tooth, 19.4; length of upper tooth-row, anterior border of canine to posterior border of M2, 10.4; length of lancet (nose-leaf), 9.0; width of lancet, 6.5; width of horseshoe, 9.0; forearm, 57.3; 3rd metacarpal, 52.6; 1st (basal) phalanx, 16.0; 2nd (middle) phalanx, 26.7; 3rd (distal) phalanx, 18.5; 4th metacarpal, 50.7; 1st (basal) phalanx, 14; 2nd phalanx, 18.8; 5th metacarpal, 54; 1st (basal) phalanx, 11.2; 2nd phalanx, 13.2; lower leg, 22.9; foot with claws, 15.2; calcar, 6.5.
Remarks.—Our single specimen, a female, was caught on July 28, 1945, by my (B. Villa's) father, Andres Villa, in a natural cave, roosting with the individuals of Glossophaga s. leachii. The northernmost locality in México from which A. p. planirostris previously has been recorded is El Papayo, in the state of Guerrero (Andersen, 1908:238), approximately 225 kilometers to the southward. A. p. planirostris and Artibeus jamaicensis closely resemble each other but A. planirostris may be recognized by the presence of a minute M3 which is absent in A. jamaicensis. Specimen no. 945b has M3 present on both sides of the upper jaw. From Artibeus hirsutus, known from La Salada, Michoacán, approximately 40 miles north and slightly to the east of El Guayabo, our specimen differs in the apparently hairless tibia and interfemoral membrane. The measurements, of no. 945b, recorded above, if compared with those given by Andersen (1908:246) are seen mostly to fall within the range recorded for A. hirsutus. Where measurements are outside this range, they fall within the range of those of the larger A. p. planirostris. We recognize that the Mexican species of Artibeus are not well understood, at least by us.
Artibeus hirsutus K. Andersen
Leaf-nosed Bat; Spanish, Murciélago Zapotero
Artibeus hirsutus K. Andersen, Ann. and Mag. Nat. Hist., 18(ser. 7):420, December, 1906, type from La Salada, Michoacán.
Range.—Known from western part of state.
Remarks.—From Michoacán, Andersen (1908:247) examined three specimens, all from the type locality.