AMPHIBIANS AND REPTILES. 153 
way in length of mouth or over commisure between fourth and 
fifth superior labials. Frontal plate pentagonal, but a trifle longer 
than broad, anterior margin nearly straight, and posteriorly con- 
vergence ending in a right angle. Internasals rather broad, some- 
what angular, and hardly more than half size of prefrontals. 
Prefrontals form a convex margin anteriorly, broad, and bending 
down over side of snout to meet loreal. Parietals large, broad, 
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Pilot Snake. Elaphe obsoletus (Say). 
and convergence posteriorly broad with but slight median notch. 
Rostral rather large, triangular in form. Nostril large, piercing 
commisure between nasals about midway in its extent. Loreal 
trapezoidal, higher in front. Supraocular moderate, a little 
shorter than frontal, convergent anteriorly. Preocular rather 
large. Postoculars 2, subequal, and rather small. Upper labials 
8, moderate, sixth and seventh largest, and eighth also large. 
