Ranged touch attacks cannot be held unless the spell says so

Limp Lash states that it's a ranged touch attack:

You must make a ranged touch attack with this spell. If you strike your target, he takes a 1d6 penalty to his Strength, Dexterity, and Constitution each round. This penalty cannot reduce any attribute to less than 1, and once any of these attributes reaches 1 the target collapses and his body, except his head, becomes paralyzed. While paralyzed in this way, the target retains full use of his senses, including the ability to feel pain, and can speak (including casting spells with only verbal components). The whip has a maximum length of 20 feet, 15 hit points, and a hardness of 5. The spell ends immediately if you let go of the whip or it is destroyed. When the spell ends, all penalties the target took from this spell also end.

PFRPG core rulebook page 186:

Ranged Touch Spells in Combat....Unless otherwise noted, ranged touch attacks cannot be held until a later turn.

Notice the "Holding the charge" (page 185) italicized section which is after the bold "Touch Spells in Combat", which makes this section look to apply only to non-ranged touch spells.

Spell is lost if initial attempt fails.

Ranged touch attacks cannot be held unless the spell says so.

Limp Lash states that it's a ranged touch attack:

You must make a ranged touch attack with this spell. If you strike your target, he takes a 1d6 penalty to his Strength, Dexterity, and Constitution each round. This penalty cannot reduce any attribute to less than 1, and once any of these attributes reaches 1 the target collapses and his body, except his head, becomes paralyzed. While paralyzed in this way, the target retains full use of his senses, including the ability to feel pain, and can speak (including casting spells with only verbal components). The whip has a maximum length of 20 feet, 15 hit points, and a hardness of 5. The spell ends immediately if you let go of the whip or it is destroyed. When the spell ends, all penalties the target took from this spell also end.

PFRPG core rulebook page 186:

Ranged Touch Spells in Combat....Unless otherwise noted, ranged touch attacks cannot be held until a later turn.

Notice the "Holding the charge" (page 185) italicized section which is after the bold "Touch Spells in Combat", which makes this section look to apply only to non-ranged touch spells.