50.

The 59 specimens from Guerrero are distributed by localities as
follows: 8 mi. N, 1 mi. W Teloloapan (Teloloapan is at 18 deg.18', 99 deg.54'),
3600 feet, 15 specimens (66432-66446, all males, including one skeleton
and two in preservative) obtained by Robert W. Dickerman on February 7,
1955; Alpixafia, 4 kms. NW Teloloapan, 1540 M., 16 specimens
(35219-35234, 5 males and 11 females) obtained by Bernardo Villa R. on
May 22 and 23, 1949; 1 mi. N Teloloapan, 7 specimens (66447-66453, all
males, including one in preservative) obtained by Dickerman on February
8, 1955; 4 kms. SE Teloloapan (Cerro Piedras Largas), 1760 M., 15
specimens (35310-35324, 12 males and 3 females) obtained by Villa R. on
October 20 and 21, 1948; Puente de Dios, 1700 M., Yerbabuena (= 8 mi.
N, 1 mi. W Teloloapan), six specimens (28408-28413, 4 males and 2
females) obtained by Villa R. on July 25 and 29, 1948. Six of the 16
Guerreran specimens taken in May are young as shown by the open
epiphyseal sutures; all other Guerreran specimens lacked these sutures.
Of 13 adult females from Guerrero, only two, taken in May, contained
embryos (one embryo in each).

Average and extreme measurements in millimeters of 28 adult
Guerreran _A. hirsutus_ of both sexes (the sexes are not
significantly different) are as follows: total length, 79.5
(69-90); length of hind foot, 15.1 (12-17); length of ear,
21.1 (19-24); length of forearm, 55.8 (53.1-57.8); greatest
length of skull, 27.11 (26.3-28.0); condylocanine length,
22.92 (22.1-23.5); lambdoidal breadth, 14.23 (13.7-14.6);
postorbital constriction, 6.51 (6.2-6.8); and weight (in
grams), 37.4 (34.0-42.6).

The presence or absence of the third molar tooth was recorded for 88
specimens (28 from Sonora, Sinaloa, and Chihuahua, and 60 from Guerrero
and Jalisco). The third molar tooth is present on both sides of the
lower jaw in all specimens except one (12413 Univ. Illinois) from
Sonora which lacks both upper and lower third molars. The upper third
molar is usually present on both sides. The exceptions are as follows:
the above mentioned Sonoran specimen and one other Sonoran specimen,
one specimen from La Bufa, Chihuahua, two from Jalisco, and five from
Guerrero lack the tooth on both sides; two specimens from Guerrero and
one from Sonora lack the tooth on only one side. Facial stripes are
absent or present but inconspicuous in all specimens recorded here. The
gener