1) Black-headed snakes 2) Genus tantilla 3) Reptile genus 
Tantilla is a large genus of harmless New World colubrid snakes which includes 64 species commonly known as centipede snakes, blackhead snakes, and flathead snakes. Tantilla are small snakes, rarely exceeding 20 cm (8 inches) in total length. They are generally varying shades of brown, red or black in color. Some species have a brown body with a b...
[n] - black-headed snakes
genus Tantilla noun black-headed snakes