False honey ants (consuming a harvestman)

Mandible triangular, with 5 or 6 teeth (rarely 7); in dorsal view, mesonotum severely constricted giving the mesosoma a distinctive hourglass-like shape; dorsal surface of mesosoma smooth and very shiny
head, thorax, and abdomen very dark brown; legs and antennae of live specimens medium brown at base, smoothly shading to pale yellow at tips (this color arrangement gives the overall impression of an insect that is very dark in the middle, and very pale at the extremities) --- (information from BugGuide)