+------------------------+---+-----------+------------+----------+ |LOCALITY | N | Curved |Intermediate| Angular | +------------------------+---+-----------+------------+----------+ |Tepalcatepec Valley | 50| 10 (20.0%)| 17 (34.0%) |23 (46.0%)| +------------------------+---+-----------+------------+----------+ |Morelos | 12| 2 (16.6%)| 5 (41.7%) | 5 (41.7%)| +------------------------+---+-----------+------------+----------+ |Izúcar, Puebla | 4| 2 (50.0%)| 0 (0.0%) | 2 (50.0%)| +------------------------+---+-----------+------------+----------+ |Southern Sinaloa | 1| 1(100.0%)| 0 (0.0%) | 0 (0.0%)| +------------------------+---+-----------+------------+----------+ |Puerto Vallarta, Jalisco| 2| 2(100.0%)| 0 (0.0%) | 0 (0.0%)| +------------------------+---+-----------+------------+----------+ |Colima | 45| 25 (55.0%)| 18 (40.0%) | 2 (5.0%)| +------------------------+---+-----------+------------+----------+ |Coast of Michoacán | 55| 35 (63.6%)| 17 (30.9%) | 3 (5.5%)| +------------------------+---+-----------+------------+----------+ |Acapulco, Guerrero | 7| 7(100.0%)| 0 (0.0%) | 0 (0.0%)| +------------------------+---+-----------+------------+----------+ |Chilpancingo, Guerrero | 10| 1 (10.0%)| 4 (40.0%) | 5 (50.0%)| +------------------------+---+-----------+------------+----------+ |Pochutla, Oaxaca | 13| 6 (46.2%)| 6 (46.2%) | 1 (7.6%)| +------------------------+---+-----------+------------+----------+ |Tehuantepec, Oaxaca |177| 81 (45.8%)| 67 (37.8%) |29 (16.4%)| +------------------------+---+-----------+------------+----------+ |Tonolá, Chiapas | 1| 0 (0.0%)| 0 (0.0%) | 1(100.0%)| +------------------------+---+-----------+------------+----------+ |Veracruz | 33| 26 (78.8%)| 6 (18.2%) | 1 (3.0%)| +------------------------+---+-----------+------------+----------+ | Total |410|198 (48.3%)|140 (34.2%) |72 (17.5%)| +------------------------+---+-----------+------------+----------+ 1. Although the highest percentage of individuals having the supraorbital and postorbital crests forming a sharp angle is from localities in the Balsas-Tepalcatepec Basin, numerous individuals from throughout the range of _marmoreus_ have the crests forming an angle (Table 1). 2. In all samples of ten or more specimens, some toads have the supraorbital and postorbital crests forming a sharp angle, some have the crests forming a curve, and some have an intermediate condition. 3. The relative size of the supratympanic crest is highly variable in all samples examined. [Illustration: FIG. 3. Adult male of _Bufo perplexus_ from Apatzingán, Michoacán. × 1.5.] [Illustration: FIG. 4. Adult male of _Bufo marmoreus_ from Pómaro, Michoacán. × 1.5.] [Illustration: PLATE 1 Hatchling of _Pseudoeurycea belli_ from San Juan de Parangaricutiro, Michoacán. × 8.]