Crocodylus

bombifrons were infected with a cestode species (Table 1).

bombifrons and, most importantly, the family Scaphiopodidae for the first time.

bombifrons be conducted, including a larger sample size and and examination of various specimens from other parts of their range.

Other taxa included in Nebraska's herpetofaunal composition include Acris crepitans, Bufo cognatus, Bufo woodhousii, Hyla chrysocelis, Pseudacris triseriata, Rana blairi, Rana catesbeiana, Rana pipiens and Spea bombifrons.

Spea bombifrons and Bufo cognatus have statewide distributions and appear at breeding sites after heavy rains during late spring and early summer.

Species codes are as follows: Hyla chrysoscelis (196), Acris crepitans (191), Pseudacris triseriata (214), Bufo americanus (172), Bufo woodhousii (188), Bufo cognatus (175), Rana blairi 224), Rana catesbeiana (228), Rana pipiens (239), Spea bombifrons (142), Gastrophryne olivacea (218).

bombifrons were significantly more likely to express the carnivore phenotype when tadpoles were reared alone (mean [+ or -] SD proportion of carnivores = 0.

bombifrons were more likely to develop the carnivorous phenotype when reared alone than when reared with kin (Table 1).

Spea bombifrons is fossorial and an "explosive" breeder, and could easily be missed during its brief breeding period.

Species likely to be affected adversely by habitat loss and degradation in the river valleys include Bufo cognatus, Spea bombifrons, Phrynosoma cornutum, Heterodon platirhinos, H.

As used in this paper, Bootherium incorporates the nominal genera Symbos (Leidy, 1852) and Gidleya (Gidley, 1906) and their synonyms, all of which have been placed in the monotypic species Bootherium bombifrons by McDonald and Ray (1989).

To date, only two records of crania of Bootherium bombifrons from Texas have been documented in the literature (Hesse, 1942; McDonald, 1985).

This specimen, TAMC 2553, became the holotype of Bootherium brazosis Hesse, 1942, since referred by Ray (1966) to Bootherium sargenti and McDonald and Ray (1989) to Bootherium bombifrons.