KEY TO ADULT FEMALE PSEUDOCOCCIDAE FROM GREENLAND

1. With 18 pairs of cerarii, several with more than 2 cerarian setae; quinquelocular pores present throughout venter; claws with a denticle.......................................................... 2

­ With fewer than 5 cerarii, each with 2 cerarian setae; quinquelocular pores absent from venter; claws without a denticle.................................................................................... 3

2. Multilocular disc­pores tending to be in distinct groups of 2–4, each group with a small oral collar tubular duct in centre; dorsal cerarii absent ........................................ ......................................................................................... Peliococcus balteatus (Green)

­ Multilocular disc­pores not tending to be in distinct groups and not closely associated with an oral collar tubular duct; dorsal cerarii present along mid­line of all segments .. ........................................................... Peliococcus (Spinococcus) calluneti (Lindinger)

3. Circulus absent; with a group of multilocular disc­pores and large oral collar ducts laterad to each anterior coxa ....................................... Atrococcus groenlandensis sp. nov.

­ Circulus present; without a distinct group of multilocular disc­pores laterad to each anterior coxa.................................................................................................................. 4

4. With many oral rim ducts present throughout dorsum; oral collar ducts absent from dorsum ..................................................................... Chorizococcus multiporus sp. nov.

­ Oral rim ducts absent from dorsum; oral collar ducts on dorsum often fairly abundant ....................................................................................................................................... 5

5. Circulus large, membranous and approximately rectangular Trionymus elymus sp. nov.

­ Circulus small, oval to almost circular and sometimes appearing slightly sclerotised 6

6. Multilocular disc­pores very few or absent from dorsum; multilocular disc­pores present ventrally on head anterior to clypeolabral shield ..... Trionymus thulensis Green

­ Multilocular disc­pores sparsely distributed on posterior 5 abdominal segments; multilocular disc­pores absent ventrally on head ........................ Trionymus bocheri sp. nov.