Machimus virginicus. We thought these were all notatus but they turned out to be this closely related species. Scarbrough had reported notatus but Jeff Barnes examination of those specimens showed the genitalia to correspond to virginicus. Subsequently all our collections over the state were virginicus. This was over 18 males overall, mainly in the NE part of the state. We have photographed other Machimus that we have felt to be notatus and they are mapped. M. virginicus is a spring species that extends into summer. Very dark legged and one of the species with all dark femurs. One of the first robbers up in many areas in April in Arkansas. Likes wooded rocky habitats in my county. This is a female again with that pointy, ink-dipped abdominal tip.

This is the male Machimus virginicus. Also from Bell. The genitalia are key in the species separations of this genus. But overall leg colorations in life are very good separations as well. The overall gray color and orange tibias are helpful in early spring.

Machimus snowii. An orangish-brown species which seems to stay close to wet areas. Note the dark femur with its red orange distal spot. Similar leg coloration appears in the species Machimus paropus and Machimus erythocnemius and Machimus snowii. This happy pair were mating on the litter near a cypress swamp. Machimus snowii possibly has two broods -- one in September and one in June/July.

Machimus erythrocnemius taken in Boone county. This was in the prairie area where Norm could not collect robbers. Fortunately this shot shows the spines on the profemora that define this prairie species. Note the orange and red markings on the legs as well. We have subsequently collected specimens of this insect in five counties in the state otherwise. It is not a strict prairie species and turns out to be more common in our state than prairiensis.

This is a Machimus male on my wife's glassy car surface in 2020. I had been away from robbers for awhile but still. It is most likely M. antimachus by the leg coloration and body.  

Machimus Specimen shots