1925] Storer: A Synopsis of the Amphibia of California 
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27. An external cutting tubercle present on hind foot in addi- 
tion to low tubercles; coloration with green spots 
Bufo cognatus cognatus 187 
27'. No external cutting tubercle; coloration without green 
spots Bufo cognatus californicus 192 
26'. Parotoid glands long, obliquely placed and descending on to 
shoulders; skin rougher, with conspicuously conical, black- 
ringed warts (pi. 11, fig. 316) Bufo woodhousii 199 
20'. No parotoid glands on shoulders; teeth present on upper jaw. 
28. Fingers and toes slender, with round expanded adhesive discs; 
head-and-body length 50 mm. or less Family Hylidae 
29. Skin rough, with fine warts, no dark stripe through eye (pi. 13, 
figs. 37, 38) Hyla arenicolor 203 
29'. ^kin smooth, without warts; a dark stripe extending along side 
of head through eye (pi. 14, figs. 40, 41) Hyla regilla 215 
28'. Fingers and toes without expanded adhesive discs.. Family Ranidae 
30. Dorso-lateral folds very distinct; numerous distinct rounded 
light-bordered black spots on back strongly contrasted with 
lighter ground color Rana pipiens 266 
30'. Dorso-lateral folds less distinct or absent; spots on back less 
distinct or less contrasted. 
31. Tympanic membrane prominently outlined, as large or larger 
than orbit (pi. 18, fig. 53); skin very smooth (pi. 18, fig. 56); 
head-and-body length of adults up to 175 mm 
Rana catesbeiana 276 
31'. Tympanic membrane less prominent, never as large as orbit; 
skin variable in surface texture; head-and-body length of 
adults less than 125 mm. 
32. Vomerine teeth rudimentary, on two oblique ridges between 
the internal nares (text figs. Q-S); tympanic region not 
darker than rest of head; fold along upper lip colored like 
rest of body, mottled or dark (pi. 12, figs. 34, 36); red 
never present in coloration of ventral surface. 
33. When hind leg is brought forward along body, inside 
angle of bent tarsus and tibia reaches at least to naris 
and often beyond end of snout; tympanum covered 
with many hispid points (pi. 12, fig. 34). 
34. A light patch on top of head; a darker area crossing the 
posterior half of each upper eyelid, merging insensibly 
into dorsal color behind (pi. 16, fig. 49); head-and- 
body length under 70 mm Rana boylii boylii 245 
34'. No light patch on top of head; darker areas crossing 
posterior half of each upper eyelid, when present, 
contrasting with dorsal coloration (pi. 12, fig. 36); 
maximum head-and-body length 81 mm 
Rana boylii muscosa 262 
33'. When leg is brought forward, inside angle of bent tarsus 
seldom reaches beyond naris; tympanum smooth or 
with but a few hispid points; no light patch on top of 
head (pi. 17, fig. 51, left); head-and-body length reach- 
ing 73 mm Rana boylii sierrae 263 
