In accordance with this manner of feeding, the mouth is kept permanently open and prevented from collapsing by a pair of skeletal cornua belonging to a sustentacular apparatus (the nuchal skeleton), the body of which lies within the narrow neck of the proboscis; the latter is inserted into the collar and surrounded by the anterior free flap of this segment of the body. [Please select]
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Nuchal region light bluish gray; flanks dark gray; dorsal ground-color dark brown, somewhat paler posteriorly. [Please select]
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Although its nuchal collar, as in immatures, is washed with pale cinnamon-buff, its thighs are not heavily marked with dark brown spots. [Please select]
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_ Wholly different; above gray; head dark; below white; a nearly complete white nuchal collar. [Please select]
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An exception is _Hypsiglena torquata dunklei_ from Forlón and San Fernando, Tamaulipas; it has the _torquata_-type of nuchal pattern. [Please select]
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The distributional picture is somewhat complicated because some individuals having the _torquata_-type of nuchal pattern also have a faint nape stripe. [Please select]
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Specimens from the three mentioned localities have the dark nuchal spot bordered anteriorly by a pale blotch. [Please select]
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