. Bulletin. Natural history; Natural history. 224 apparently nocturnal. No information is available on the number or dimensions of the ejigs in the northern part of the range of the species. Illinois Distribution.—The sole Illinois specimen bears the label "Wolf Lake Swamp, Union Co., Illinois, July 26, 1942, F. R. ; It was mistakenly cataloged as Lam- propeltis tr'tangulum syspila. Bennett (1953), at my suggestion, reported the error and re- corded the genus for Illinois. Despite heavy collecting in the area, this specimen remains the only record for the state, fig. 211. There
. Bulletin. Natural history; Natural history. 224 apparently nocturnal. No information is available on the number or dimensions of the ejigs in the northern part of the range of the species. Illinois Distribution.—The sole Illinois specimen bears the label "Wolf Lake Swamp, Union Co., Illinois, July 26, 1942, F. R. ; It was mistakenly cataloged as Lam- propeltis tr'tangulum syspila. Bennett (1953), at my suggestion, reported the error and re- corded the genus for Illinois. Despite heavy collecting in the area, this specimen remains the only record for the state, fig. 211. There is growing doubt in the minds of herpetol- ogists at Southern Illinois University that the specimen actually came from Wolf Lake. I am inclined to accept the record as valid, in view of similar circumstances in Indiana and Missouri, where many years elapsed before the initial records were substantiated by additional specimens, and in view of the failure of many hundreds of collectors over many decades to find Tantilla gracilis and Natrix cyclopion in the Wolf Lake area. Ceinophora probably occurs on the slopes of Pine Hills rather than in the swamp. Illinois .Natural History Survey Bulletin Vol. 28, Art. I Tantilla Baird & Girard |] This New World genus contains, in the United States, nine species, some of which have several subspecies, (^ne species is found in southwestern Illinois. Tantilla gracilis hallowelli Cope Northern Flat-Headed Snake I Tantilla /lalloivclli Cope 1860a:77 (type local- ity: Manhattan, Kansas). Tantilla gracilis /lalloivelti, Smith & Burger 1950:2. Diagnosis.—A diminutive snake (largest Illinois specimen 203 mm. in total length), fig. 212, with 15 rows of smooth scales; flat- tened head, little wider than neck; frontal about four times the size of either supraocu- lar; no loreal; preoculars 1 + 1, postoculars 1 + 1 ; supralabials usually 6 + 6; infra- labials usually 6 + 6; eyes minute; anal plate divided; ventrals 121 to 132; caudals 42 to
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