This large bristletail (size estimated) was running around on the porch wall at the field station at night. Looks very similar to Tom Murray's recent post from MA:

I had originally estimated the size as 17 mm, but that, perhaps, was influenced by the appendages--the body was perhaps about 10-12 mm.
I see our bristletail taxonomy is pretty thin. There are just two families in this order in North America, according to, for instance, Arnett (1) and Marshall (2), Machilidae and Meinertellidae. Marshall says that Machilidae have scales on the basal antennal segments and the other family does not. Arnett also gives a key based on abdominal segments, and based on these it looks like Tom's and my photos are Machilidae. Marshall, p. 25, has a photo of Pedetontus saltator (12 mm) and Evans (3), p. 55, shows a Pedetontus species. Those look similar to Tom's and my photos, so this is perhaps a Pedetontus. Some work needs to be done on these guides, and I think we can assign images at least to families. I imagine most are Machilidae.

(Update September 2009. See Tom's comments below--his image is a Trigoniophthalmus alternatus.)

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