Diptera-Flies
| Asailidae Efferia sp. Female Robber fly | Robber flies are predators on flying insects. This fly was photographed by Bob Hammon near Gateway (Mesa County) on Sep 1, 2005. |  |
| Tachinidae Paradejeania rutiloides Spiny tachinid | Tachind fly larvae parasitise other insects. This species parasitises caterpillars. Adult flies feed on nectar. This one was photographed by Bob Hammon in September 2005 in Rio Blanco County. The fly is feeding on tailleaf pericome, Pericome caudata. |  |