. Bulletin. Natural history; Natural history. 24 Natural History Survky Bulletin Vol. 28, Art. 1. TAIL COSTAL GROOVES Fig. 9.—Lateral view of a salamander, Ambystoma texanum. Premaxiliary teeth in a single series; head wider than neck; lingual plicae radiate. fig. 14 9 9. Pattern consisting of 4 to 8 silvery white crossbands on dorsum Ambystoma opacnm Pattern not consisting of white cross- bands . 10 10. Body long and slender; toes of adpressed limbs barely overlapping Ambystoma laterale Body stout; toes of adpressed limbs over- lapping by length of longest finger or more 11 11. Gro
. Bulletin. Natural history; Natural history. 24 Natural History Survky Bulletin Vol. 28, Art. 1. TAIL COSTAL GROOVES Fig. 9.—Lateral view of a salamander, Ambystoma texanum. Premaxiliary teeth in a single series; head wider than neck; lingual plicae radiate. fig. 14 9 9. Pattern consisting of 4 to 8 silvery white crossbands on dorsum Ambystoma opacnm Pattern not consisting of white cross- bands . 10 10. Body long and slender; toes of adpressed limbs barely overlapping Ambystoma laterale Body stout; toes of adpressed limbs over- lapping by length of longest finger or more 11 11. Groundcolor black or brown, with yellow spots 12 Groundcolor black or brown, without yel- low spots 13 12. Two dorsolateral rows of subequal yellow spots; venter and lower sides brown and unspotted Ambystoma maculatum Irregularly spaced and unequal yellow- spots on back and sides and often on venter . Ambystoma tigrinum tigrintim 13. Head width 23 per cent or more of snout- vent length Ambystoma talpoideum Head width less than 23 per cent of snout- vent length 14 Snout-vent length over 50 mm.; back dark or with brassy flecks Immature Ambystoma tigrinum tigrinum Snout-vent length under 50 mm.; back dark and with or without flecks 15 Dorsum brown, often with brassy flecks; venter yellow or white Immature Ambystoma maculatum Dorsum black or brown, often with ir- regular white blotches; venter brown Immature Ambystoma opacum Light line from eye to angle of jaw, fig. 15 ; tail triangular in cross section Dcsmognathus fuscus conanti No light line from eye to angle of jaw; tail not triangular in cross section 17 17. Tongue with a central pedicel, free all 14. 15 16. 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 Educatio
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