AMPHIBIANS-REPTILES, DICKINSON CO. 25 
KEY TO ADULT AMPHIBIANS (SALAMANDERS, FROGS, AND 
TOADS) LIKELY TO BE FOUND IN DICKINSON COUNTY, IOWA 
al, Tail present; hind legs not elongated for jumping. 
bi. Four toes on hind foot; external gills present throughout life........... 
Necturus maculosus (Rafinesque). 
b2. Five toes on hind foot; no external gills on adult; dark brown or 
black, variously spotted with yellow. 
Ambystoma tigrinum (Green). 
a2. Tail absent; hind legs elongated for jumping. 
Cle icin) Gry fem Wet h yen eaeee Bufo americanus Holbrook. 
e2, Skin moist and not warty. 
di. A pair of dorso-lateral ridges; no sucking disks on toes. Back 
with roundish black spots edged with white..............--...---1-s--s--+++ 
Rana pipiens Schreber. 
d2 No dorso-lateral ridges; sucking disks on toes present, even if 
small. 
el, Belly smooth; upper surfaces somewhat roughened; snout 
pointed; sucking disks minute; size 1 to 1 1-4 imches............ 
Acris Gryllus (Le Conte). 
e2, Belly granular; upper surfaces smooth. 
f1. Sucking disks large; a broad whitish band from eye to 
angle of mouth; size over 1 inch. 
Hyla versicolor versicolor Le Conte. 
f2, Sucking disks minute; no broad band from eye to angle of 
mouth; on sides of body two dark bands separated by a 
lighter one, the lower band passing forward through the 
eye to the snout Pseudacris trisertata (Wied). 
KEY TO REPTILES (LIZARDS, SNAKES, AND TURTLES) LIKELY 
TO BE FOUND IN DICKINSON COUNTY, IOWA 
al, Legs present. 
b1. No broad dorsal shield; body elongate, covered with smooth scales 
j Arey OU sl aNG) vt Ae Ses ee eR ae ee Pleistodon septentrionalis Baird. 
b2. A broad dorsal shield, or carapace, present; body short and broad. 
el, Carapace flexible at the edges. 
di, Front margin of carapace with conical tubercles..............-.------- 
Amyda spinifera (LeSueur). 
d2. Front margin of carapace smooth.....dmyda mutica (LeSueur). 
e2, Carapace not flexible at the edges. 
el, Ventral shield, or plastron, very narrow, exposing the soft 
| gk See Sede See ee eee Chelydra serpentina (Linné). 
e2, Ventral shield or plastron broad. 
f1, Parts of plastron immovably attached to each other and to 
carapace> throat with? black ‘stripes. ces eer 
Chrysemys marginata belli (Gray). 
f2, Plastron with a transverse hinge, and movably attached to 
earapace, throat yellow without black stripes. 
ff1. Upper jaw notched in front; carapace long and depressed 
Emys blandingii (Holbrook). 
ff2. Upper jaw produced downward at symphysis to form a 
hook; carapace: short “and: highs oS 
Terrapene ornata (Agassiz). 
a2. Legs absent. 
gi. No anterior fangs in upper jaw; no rattle on end of tail. 
hi, Anal plate entire (i. e. not divided). 
