Eriococcidae, Cockerell, 1899

Key for separation of adult female Eriococcidae View in CoL View at ENA on Quercus sp. in western Palaearctic:

1. Anal lobes neither sclerotised nor elongate; anal ring setae subequal to or shorter than width of anal ring; with a group of cruciform pores medially on head and on all thoracic segments; macrotubular ducts absent from venter; dorsal spinose setae capitate..................................... Kotejacoccus turcicus Kaydan & Kozár

- Anal lobes sclerotised and elongate; anal ring setae each much longer than width of anal ring; cruciform pores restricted to submargins; macrotubular ducts present on venter; dorsal spinose setae not capitate.2

2. Minute sclerotised pores present in a group on posterior coxae and posterior femur; small macrotubular ducts present throughout venter; spinose setae present in a fairly broad submarginal band ventrally on thorax and head; outer orifice of microtubular ducts without wing-like extensions.......................................... ................................................................................................................. Eriococcus thymelaeae Newstead View in CoL

- Minute pores absent from posterior coxae and posterior femur; small macrotubular ducts on venter restricted to medially on abdomen and metathorax; spinose setae not present in a fairly broad submarginal band ventrally on thorax and head; outer orifice of microtubular ducts with wing-like extensions...........3

3. Smallest ventral macrotubular ducts very few, with generally fewer that 10 across width of abdominal segments III and IV, and absent from segment VII.....................................................................................4

- Smallest ventral macrotubular duct common medially on all abdominal segments, generally with more than 15 across width of abdominal segments III and IV, and also present on segment VII.......................... .............................................................................................................................. Eriococcus roboris Goux View in CoL

4. Ventral medium-sized macrotubular ducts only present submarginally, mainly on head and posterior abdominal segments; without a seta on antennal segment III E. melnikensis Hodgson & Trencheva , sp. n.

- Ventral medium-sized macrotubular ducts present medially on most abdominal segments; with setae on antennal segment III...................................................................................................... E. aceris (Signoret)