This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...study concerns itself with the following species and subspecies: 1. Thamnophis sirtalis parietalis 2. Thamnophis sirtalis concinnus 3. Thamnophis sirtalis infernalis 4. Thamnophis eques 5. Thamnophis ordinoides ordinoides 6. Thamnophis ordinoides atratus 7. Thamnophis ordinoides elegans 8. Thamnophis ordinoides couchii ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...study concerns itself with the following species and subspecies: 1. Thamnophis sirtalis parietalis 2. Thamnophis sirtalis concinnus 3. Thamnophis sirtalis infernalis 4. Thamnophis eques 5. Thamnophis ordinoides ordinoides 6. Thamnophis ordinoides atratus 7. Thamnophis ordinoides elegans 8. Thamnophis ordinoides couchii 9. Thamnophis ordinoides biscutatus 10. Thamnophis ordinoides vagrans 11. Thamnophis ordinoides hammondii 12. Thamnophis marcianus 13. Thamnophis megalops 14. Thamnophis angustirostris These snakes usually may be distinguished by the characters set forth in the following "key," but it often will be necessary to have series of specimens, since individual variation is so great that a single specimen may not show the normal characters and may be referred to the wrong section. Thus, a specimen of T. s. concinnus having eight supralabials might be referred to T. eques, or one of T. o. atratus with seven labials might cause confusion, whereas a series of three or four specimens would immediately clear up the matter by showing these counts to be abnormal ones. KEY TO THE GARTER-SNAKES OF WESTERN NORTH AMERICA a.--Lateral light stripe anteriorly not involving scales of the fourth row. b.--Lateral stripe anteriorly upon scales of the second and third rows. c.--Supralabials normally seven. d.--Eye large, posterior genials much longer than anterior, infralabials usually ten, scale-rows IS)--19--17. e.--Gastrosteges (146 to 170) and urosteies (66 to 95) average fewer in number (156-166 and 76 to 85). f.--Coloration lighter, with broader light lines. T. sirtalis parietalis p. 190 P.--Coloration usually darker both above and below, lines often narrower. T. sirtalis concinnus p. 192 e'.--Gastrosteges (156 to 177) and urosteges (74 to 97) average m...
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