Acron + 4 segments 1. Intercalary 2. Mandibular 3. Maxillary 4. Labial Labrum appendiculate, part of intercalary segment Antenna not appendiculate, part of acron Butt, 1960
Acron + 5 segments 1. Antennal 2. Intercalary 3. Mandibular 4. Maxillary 5. Labial Acron large Matsuda, 1965
6 segments 1. Labral 2. Clypeal 3. Aculo-antennal 4. Mandibular 5. Maxillary 6. Labial Intercalary absent Ferris, 1950
7 segments 1. Labral 2. Preantennal (ocular) 3. Antennal 4. Intercalary 5. Mandibular 6. Maxillary 7. labial Sharov, 1966
7 segments 1. Labral 2. Preantennal 3. Antennal 4. Intercalary 5. Mandibular 6. Maxillary 7. Labial Labrum appendiculate Roonwal, 1938