This robber fly is Neoitamus flavofemoratus. This is the male and note the visible banding which is less prominent in the female. They are only 12 mm or so long and very delicate fliers. They can be grouped among the twig sitters with Ommatius and Nicocles among others. Females and males were buzzing around together on this twiggy brush. Appeared to be feeding on small moths.

A female from the same area. Note the orange fore-tibia beneath. This separates it from our other Neoitamus species orphne which has nearly fully black fore-tibias. The elongate abdomen gives these almost a female Efferia look but this abdomen is in separate segments with the final segment being incorporated into the genitalia. Eyes appear green except with lighting as in this flashed shot.

Another female, this one from the Toadsuck area in a group that thought that horsetails were made for robber fly perching.

And this is a female from the related genus Neomochtherus. This is a western species and was shot in Montana by Mr. Allen extending the range of this N. californicus. There are essentially two eastern species, N. auricomus and N. latipennis, and I think the female genitalia is fairly distinctive in this group that otherwise looks like fancy Machimus. N auricomus occurs throughout most of the east. See the specimen here. N. latipennis is a Northeastern species found as far west as Michigan. Males have a blunter genital bulb than Machimus and a slimmer abdomen overall.

A dorsal shot of the same Montana female.