What is "syringogaster"

Syringogaster is a genus of small (4 to 6 mm) ant-mimicking flies with a petiolate abdomen, a long prothorax, a swollen and spiny hind femur, and reduced head size and large eyes. There are 20 described extant species and two species known from Miocene amber from the Dominican Republic. It is the only genus in the family Syringogastridae.