. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 28, Art. 1. Figs. 141-146.—Characteristics of lizards: 141, head of Scincella laterale; 142, head of Eumeces; 143, chin of Eumeces ant/iracinus, showing single postmental (pm) scale; 144, head of Eumeces laticeps, showing single post- labial (pi) scale; 145, head of Eumeces sep- tentrionalis; 146, head of Eumeces fasciatus, showing two subequal postlabial scales. rows 1 and 2 of venter usually with thin, longitudinal dark stripes Ophisaurus aitenuatus attenuatus White markings on posterior corner of
. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 28, Art. 1. Figs. 141-146.—Characteristics of lizards: 141, head of Scincella laterale; 142, head of Eumeces; 143, chin of Eumeces ant/iracinus, showing single postmental (pm) scale; 144, head of Eumeces laticeps, showing single post- labial (pi) scale; 145, head of Eumeces sep- tentrionalis; 146, head of Eumeces fasciatus, showing two subequal postlabial scales. rows 1 and 2 of venter usually with thin, longitudinal dark stripes Ophisaurus aitenuatus attenuatus White markings on posterior corner of scales; no distinct middorsal stripe; no dark stripes on venter Ophisaurus 'ventralis 3. Scales strongly keeled (Iguanidae) . . . Sceloporus undulatus hyacinthinus Scales not keeled 4 4. Scales above granular 5 Scales above large, smooth, and imbricate (Scincidae) 6 5. Venter with large transverse plates; dor- sum with six light longitudinal stripes (Teiidae) Cnemidopliorus sexlineatus sexlineatus Venter without large transverse plates; :i distinct black collar on the neck (Iguan- idae) Crotaphytus coUaris collaris 6. Frontonasals contacting rostral, fig. 141; maximum snout-vent length II/2 inches Scincella laterale Frontonasals separated from rostral by a pair of supranasals, fig. 142; maximum snout-vent length 5 inches 7 7. One large postmental, fig. 143; pro- nounced, lateral dark stripe 2 scale rows wide . Eumeces anthracinus pluvialis Two postmentals; lateral dark stripe, if present, poorly defined 8 8. Postnasal scale present, fig. 144; dorso- lateral light stripe, if present, no more pronounced than middorsal light stripp ^ 9 No postnasal scale, Hg. 145; conspicuous dorsolateral light stripe Eumeces septentrionalis septentrionalis 9. One or no postlabials, fig. 144; usually 8 supralabials on each side Eumeces laticeps Two sube(iual postlabials, fig. 146; usu- ally 7 supralabials on each side Eumeces fasciatus IGUANIDAE Twelve genera of this family occur in the United
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