There's an old saying that "good things come in threes."

Well, they also come in twos.

When insect photographers manage to get two insects in the same photo, it's a "two-for."

Autumn is in full swing now, and the colder weather is settling in, but insects continue to provide a variety of diverse photo opportunities.

Two of a kind: a pair of mating Gulf Fritillary butterflies on a passionflower vine, two female sweat bees on goldenrod, and two female Valley carpenter bees on a passion flower.

Gulf Fritillary butterflies: Agraulis vanillae.

Sweat bees: Halictus ligatus.

Valley carpenter bees: Xylocopa varipuncta.

But if you look closely, there are three insects in the Valley carpenter bee photo. The other is a Gulf Fritillary caterpillar.

Good things come in threes, too.