silk worm size

[bluejen1313]

I recently bought some silkworms from Coastal Silkworms.  I ordered the small ones.  They have grown since I got them and now some are kind of big.  Does the "as big as the space between their eyes" count for worms?  Do I measure them by length or width?

[beardielover17]

With soft bodied worms like silkworms, hornworms, butterworms and waxworms the rule can be stretched a bit. If the insect is longer than the space between their eyes when the insect is held horizontally