Here is drywood termite frass from a house in Angles Camp, California. They were feeding in a kitchen cabinet area, and appeared to be a recent move-in.

5 December 2017. Specimens collected by Garrett Brouns.

Unidentified frass. Sonora California. 12 October 2017. Collected from basement, by Josh Esposito.

holes are about 1/8 inch diameter

Frass visible inside exposed lumber

Frass visible inside exposed lumber

Exit holes

Millimeter scale. frass about 0.75 mm in length.

On 7 May 2016,  I retrieved a large caterpillar from a valley oak tree. I attempted to raise it, but the caterpillar died in the cocoon stage. Dr. Lynn Kimsey (thanks!) identified it as a Pacific tent caterpillar, Malacosoma constricta. It was a solo individual, and no netting or tenting was seen. Below are photos of the frass and the caterpillar. For image of moth, see this page.

Distribution of the Pacific Tent Caterpillar

The frass crushed to reveal any detail of constituents.

The frass crushed to reveal any detail of constituents.

Collected by David Katosic, 16 March 2017. Apple Valley Estates, coming from behind exterior window trim.

Then, on 17 April 2017, David Katosic retrieved samples from within the window casing, and it was quite interesting. See below, IN THE NEST.

IN THE NEST

The nest was accessed. It appears we have  solitary bee nest. The interior of the nest itself had a mixture of pollen, larval frass, minerals used to construct the nest, and mites. We videoed the mites, and the link is at the bottom of this post.

This appears to be a pupa

mite

pupa with what we think are larval frass attached

This came from an enclosed subfloor in a house in Copperopolis. The animal has been eating a lot of beetles. Specimen collected by Ryder Richards, 10 October 2016.

Sample from Gold Springs, Columbia California, 8 June 2016. Collected by Garry Brouns.

More images of drywood termite frass (33318):

Click on an image to enlarge it.

The blue lines are millimeter markings

The blue lines are millimeter markings