. Bulletin. Natural history; Natural history. EYE TYMPANUM TIBIA FOOT TARSUS Fig. 54.—Lateral view of a frog. tympanum absent (Microhylidae) . Gastrophryne carolinensis carolinensis No fold of skin behind head; head ap- proximately one-third the snout-vent length ; tympanum present 6 6. Terminal toe pads and intercalary carti- lages present, fig. 57 (Hylidae) 7 Terminal toe pads and intercalary carti- lages absent, fig. 58 (Ranidae) . • 14 7. Toe pads scarcely wider than penultimate joints; snout-vent length less than 3 5 mm • Toe pads distinctly wider than penulti- mate joints; maximum sno
. Bulletin. Natural history; Natural history. EYE TYMPANUM TIBIA FOOT TARSUS Fig. 54.—Lateral view of a frog. tympanum absent (Microhylidae) . Gastrophryne carolinensis carolinensis No fold of skin behind head; head ap- proximately one-third the snout-vent length ; tympanum present 6 6. Terminal toe pads and intercalary carti- lages present, fig. 57 (Hylidae) 7 Terminal toe pads and intercalary carti- lages absent, fig. 58 (Ranidae) . • 14 7. Toe pads scarcely wider than penultimate joints; snout-vent length less than 3 5 mm • Toe pads distinctly wider than penulti- mate joints; maximum snout-vent length 70 mm 1^ 8. Toes fully webbed; back with numerous -vvarts Acris crepitans blanchardi Toes unwebbed, or web restricted to a flange on side of each digit; back smooth 1 9 to granular ^ 9. Lateral dark stripe arising on snout, pass- ing through each eye to shoulder; sub- orbital dark spot; body short and squat Pseudacris streckeri illinoensis Lateral dark stripe passing through each eye beyond shoulder; light, straight- edged maxillary stripe; no suborbital spot; body flattened and elongate. .10 Tibia 47 per cent or more of snout-vent length; dorsal pattern weak; longitud- inal stripes, if present, each usually less than one-half width of interspace. Pseudacris triseriata fcriarum Tibia 46 per cent or less of snout-vent length; dorsal pattern usually of distinct longitudinal stripes, each stripe as wide 10. Figs. 55-58.—Characteristics of frogs foot of Scaphiopus; 56, foot of Bufo; 57, of Hyla, showing intercalary cartilage terminal pad; 58, digit of Rana. : 55, digit and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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