Related Clues:

• Even smaller
• Like punkies, vis-à-vis fleas
• Smaller than small
• More minute
• Smaller
• Closer to the minute?
• More minuscule
• Comparatively small
• Harder to make out
• More wee
• More petite
• Harder to spot
• Harder to see
• Even more itsy-bitsy
• Less likely to be seen