Contact of mental with chin-shields
Of the 246 specimens examined, 190 (77.2%) have the mental in contact with both anterior chin-shields. The mental is in contact with only the left anterior chin-shield in 15 specimens, only the right anterior chin-shield in 2
specimens, and the mental does not contact either anterior chin-shield in 39 specimens. Separation of the mental and an anterior chin-shield always results from the posterior elongation of a first infralabial.
Table 3. Variation in Number of Supralabials Entering the Eye in 246 Specimens of Tantilla gracilis.
| Supralabials | Number of specimens | Per cent of occurrence | |
|---|---|---|---|
| Left | Right | ||
| 3 + 4 | 3 + 4 | 233 | 94.7 |
| 4 + 5 | 3 + 4 | 4 | 1.6 |
| 4 | 3 + 4 | 1 | 0.4 |
| 3 + 4 | 4 + 5 | 5 | 2.0 |
| 3 + 4 | 4 | 1 | 0.4 |
| 3 + 4 | 3 + 4 + 5 | 1 | 0.4 |
| 3 + 4 + 5 | 3 + 4 | 1 | 0.4 |