44 
NORTH AMERICAN B ATRAC III A AND REPTILIA. 
over fifth labial; color above yellowish or brownish, with darker 
dorsal blotches, 20 to 30 from head to anus; sides more or less 
mottled with dark blotches; occasionally uniform black above; 
dorsal rows 23-25; all, or all but two or three outer rows strongly 
keeled; (4. 125-150. Austroriparian or Eastern regions. 
78. II. platyrhinus, subsp. atmodes, (B. and G.) Cope. Ros- 
tral obtuse, but little prominent; scales on back of head obsoletely 
carinate; center of eye over fourth labial; color above pitch-black, 
with 25 light yellow transverse dorsal bands (sometimes nearly 
obsolete); sides mottled with black and yellowish; beneath 
yellowish, blotched with black; young specimens somewhat 
lighter; dorsal rows 23; the scales with short keels, the outer 
rows obsoletely carinate; G. 130-145. North Carolina to 
Georgia. 
B. Azygos encircled by from live to ten small plates. 
79. H. simus , subsp. simus , (Linn.) Cope. Ilog-nosed 
Snake. Vertical as broad as long; upper labials high, seven to 
eight; ground color above light brownish-yellow, with a dorsal 
series of about 35 transverse black blotches; on sides from one 
to three smaller series; beneath yellowish, obscurely maculate; 
dorsal rows 25, outer ones smooth; G. 115-135. Austroriparian 
region, except Texas; Illinois and Wisconsin. 
Order LACERTILIA. 
Synopsis of Families. 
A. Vertebrae proccelian; parietal bone single. 
a. Pterygoidin close contact with sphenoid. 
Teeth simple, conical, and pointed, attached to the inner 
side of the jaws; tongue scaly; body covered by 
square equal shields; limbs usually absent; tail very 
short AmphisbcBnidce. 
1). Pterygoid not touching sphenoid. 
x. Supranasal plates not more than one pair; clavicle 
with a dilated proximal end. 
Premaxillary single; temporal fossae not roofed; 
xiphisternal fontanelle present; tongue squamose 
or squamose-papillose; nostril either in a plate or 
suture Teidce. 
Premaxillary double; temporal fossae roofed; 
