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.

Published as part of Gertsson, Carl-Axel & Hodgson, Chris, 2005, Four new species of mealybug (Pseudococcidae) and a new species of soft scale (Coccidae: Coccoidea: Hemiptera) from Greenland and redescriptions of a mealybug and a soft scale from Arctic Canada, pp. 1-24 in Zootaxa 897 on pages 2-3, DOI: 10.5281/zenodo.170943