The Bombyliidae are another large fly family in North America with 900 members (this appears to have been reduced with several genera going to a new family). There are 66 genera listed in Nearctica. They are highly concentrated in the west and we likely have only 100 to 150 species in the east. List is being prepared and it is now here.

This is a huge species, I thought it was possibly an Anthrax but apparently it is our only Xenox species. It was previously placed in the Anthrax genus. I have subsequently seen what I think is this species on my deck railings. And they seemed to be focusing on the areas where the wood boring (carpenter) bees were nesting. Some Anthrax are known to parasitize this group. I suspect mine was.

Some of the smaller Anthrax species are 3 or 5 mm in size. The wings in all are often barred or marked. The larvae are parasitic on immature larvae of other insect groups. Adults like flowers and are often found in open sunny places. They can also be seen in wet or muddy areas in open sunshine in summer. Wings are usually held out when perched. Most are fast fliers, they buzz like bees when caught in nets.

The fuzzier, more bee-like type. These are in the Bombyliinae. Often with patterned wings as noted here. Pattern following the cells. I believe this wing pattern is unique in the US and this is Bombylius major. Common throughout the US in April and May. Adults are strictly flower feeders and the larvae are predaceous on other larvae of flies, butterflies and wasps. There are 61 species of Bombylius listed in Nearctica. And in the east we likely have about 15 to 20.

The other strongly marked Bombylius species in spring from Norm's NE sector of the state. I am not sure I see this one down farther south. Distinctive I hope with those creamy sideburn tufts and the wings in spray paint chocolate. Bombylius pulchellus.

Smoky dark wing markings instead of the well defined black above. This Bombylid was out in May and has a distinctive white cross of bright white spots on the exposed abdomen especially in flight. You can see the top two here. Likely a Bombylius as well but I don't have the species yet.

I believe this is a smaller Bombylius species at maybe 8mm. Flying in June in Searcy county. It is not B. pygmaeus due to the wings. But there are about 14 species here in this genus.

And Cheryl's nice shot of a Heterostylum species. Only two likely in the east, H. croceum and robustum. The indented posterior eye margin and the rounded area between the eyes are useful.

This similar profile is a Geron species. More hump-backed and a different shape to the antenna terminal. Also one of the larger genera in the east. And I have no current access to species definitions. Also about 8mm or less and very intense nectar lovers.

The grayer and perhaps slightly larger Geron species from the big burned prairie area at Camp Robinson proper. Windy day and this fly was so fast it could jump out of the image field when the flash fired.

Another Geron species doing some summer nectaring. Quite a big species group and difficult. Wary and small.

A possible member of the Chrysanthrax genus with the golden body hair and the black wing marks. From Petit Jean.

Likely a Villa or Exoprosopa member. Very clear wings for these groups but you can see a black edge up front. Purplish sheen on the thorax. Also from Petit Jean.

Another member of the Exoprosopinae. And this one is a late summer flier with an impressive wingspan. Likely Exoprosopa fasciata, a common east and southern species. Easily 40 percent larger than the above relation. This group may include about half the eastern species.

Another shot from late summer, probably of E. fasciata as well. About 15 species in this genus in the east.

Don't know the genus on this one. Larger than the flashy Chrysanthrax above. Likely also Exoprosopa. Very skittish. Kept landing down inside the plants and not on the ground.

Fall specimen from Toadsuck. Large fly and in the sandy areas but preferred to land on stones. May be a Poecilanthrax but not sure which species. Golden-edged and black banded.

I don't think these are common here. And neither species of Aldrichia were known from AR, though both species A. ehrmanni and auripuncta were known from neighboring states. I have no idea of the biology on these guys. Distinctive facial structures and smoky wings with the slightly upturned terminal abdomen. 

A distinctive Bombylid that does not look Bombylid. Looks like an Ammophila wasp and these were nectaring with Ammophila. Or, I should say the female on the left was nectaring, the male was just along for the sexual ride and was getting nothing to eat. Only one species in the east, Systropus macer.

And a solo Systropus nectaring in that waspish pose.