In profile, lower side of gaster very slightly upcurved towards apex; rims of antennal sockets raised and free with a deep cleft between them (part)
In profile, lower side of gaster slightly downcurved towards apex, and here some-what beak like; rims of antennal sockets neither raised nor free and hence no cleft between them. (Very small species, not surpassing 2.2mm.)