In comparing specimens of _D. spatulata_ from southern Sinaloa (UMMZ 115322) with specimens of _D. reticulata_ from Tehuantepec, Oaxaca (UMMZ 115321), the differences noted by Taylor (1942c:60) were found to be constant. But specimens from Ostula, Michoacán (UMMZ 104418), and five individuals from Colima (TNHC 26379-83) were found to be intermediate in certain characters. The skin of the dorsum in _D. reticulata_ is granular; that in _D. spatulata_ is smooth. The skin in specimens from Ostula and Colima is slightly granular. The dorsal ground color of _D. reticulata_ is yellowish brown with dark reticulations; the dorsal ground color of _D. spatulata_ is olive-green. Specimens from Ostula and Colima most closely resemble those from Tehuantepec in coloration, but the reticulations are more coarse, and the ground color has an olive-green tint. _Diaglena reticulata_ also differs from _D. spatulata_ in having a larger over-all size, slightly broader head, a narrower interorbital distance, and a more pointed snout with a deeper labial shelf (Table 4). The specimens from Ostula and Colima are intermediate between _D. reticulata_ from Oaxaca and _D. spatulata_ from Sinaloa in body proportions. Of three specimens from the Tepalcatepec Valley (JRD 5991-3), only two are suitable for measuring. These specimens are smaller than adults from the coastal areas and have broader heads and snouts, but narrower interorbital distances, than specimens in the other samples (Table 4). The texture of the skin is like that of specimens from Ostula and Colima. The coloration resembles that of _D. reticulata_, but the reticulations are bold and form indistinct bands on the hind limbs. TABLE 4.--COMPARISON OF FOUR CHARACTERS IN FIVE SAMPLES OF DIAGLENA. (ALL DATA ARE FOR MALES; MEANS GIVEN IN PARENTHESES BELOW RANGES.)