. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 175 26. Suboculars separating eye from labials; 28. venter predominantly dark, with light spots, fig. 172 Matrix cyclopion cyclopion No suboculars, fig. 173; venter yellow, with dark spots Matrix rhombifera rhombifera 27. Venter unmarked, yellow or red 28 29. Venter marked with brown or black spots or blotches 29 Ventral color red or red-orange, not touch- ing first scale rows; dorsum black Matrix erythrogaster neglecta Ventral color yellow or orange-yellow, en- croaching on lowermost latera
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. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 175 26. Suboculars separating eye from labials; 28. venter predominantly dark, with light spots, fig. 172 Matrix cyclopion cyclopion No suboculars, fig. 173; venter yellow, with dark spots Matrix rhombifera rhombifera 27. Venter unmarked, yellow or red 28 29. Venter marked with brown or black spots or blotches 29 Ventral color red or red-orange, not touch- ing first scale rows; dorsum black Matrix erythrogaster neglecta Ventral color yellow or orange-yellow, en- croaching on lowermost lateral scale rows; dorsum brownish black Matrix erythrogaster flavigaster Dorsal bands fewer than 20 Matrix sipedon confluens Dorsal bands 20 or more 30. 169 1 f'^-^' ^-^~l^^-~Characteristics of snakes: 163, head of Agkistrodon piscivorus, showing A7^ u ^'i' J ' '^'^'^^'^ ^"^' P'^fe; 165, entire anal plate; 166, head of Heterodon platyrhinos; 107, head of Heterodon nasicus; 168, head of Virginia valeriae, showing elongate scale between eye and nostril that is termed loreal because its length is twice its height; 169, head of Storeria dekayi; 170, head of Opheodrys vernalis; 111, head of Farancia abacura; 172, head of Matrix cyclopion, showmg suborbital scales; 173, head of Matrix rhombifera.. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division