246 [April, 



Physokermes—Q&c rounded, divided from beneath into two equal portions by a 



ventral skin. 

 Lecanopsis — case subterranean, without ovisac. 

 Aclerda— like the preceding, differing in the absence of legs and antennoe in the 



adult insect ; ^ unknown. 

 Fairmairia — ? , formed as of two waxen scales united, each surmounted by a small 



elevation. 

 Ceroplastes — ? , varying in form according to age, when adult it has six or more 



waxen plates round a central one ; S unknown. 



COCCINA. 

 With or without scale-covering. 

 Kermes — $ globose, with a narrow base of attachment. 

 Gossyparia~co\eYQdi with cottony matter, ultimately leaving only the disc of the 



scale visible. 



Eriococcus — small white sac ; $ smaller. j 



Acanthococcus — small white sac, very near to the preceding. 

 Rhizococcus — naked. 



Bactylopnis, Coccus and other genera of this division, being the insects com- 

 monly known as " Mealy Bugs," are without scales, and being also to a great extent 

 exotic, are left out of this enumeration, but they may be the subject of future notes 

 if desired. 



PLANTS AFFECTED, AND THE COCCID^. 



Alder, Lecanium gihher, Dalm. 



Ash, Pulvinaria fraxini, Licht. 



Asperula cynanchina (roots), Lecanopsis rhizophila, Targ. 



Bay, Lecanium lauri, Boisd. 



Berberry, Lecanium herheridis, Schrk. 



Bilberry (leaves), Chionaspis vaccinii, Bouche. 



Birch, in cracks of (or under) last year's bark, Aspidiotus hetulcs, Baer. 



Box (leaves), Mytilaspis huxi, Bouche, Eriococcus huxi, Fonsc, in May. 



Box, holly, ivy, Aspidiotus hederce, Yallot. 



Broom, Aspidiotus genistce, Westw. 



Butcher's broom and fig trees, Ceroplastes rusci, Lin. 



Camellia, Aonidia lauri, Bouche. 



Currant, Pulvinaria ribesice, Sign. 



Dogwood, Lecanium corni, Bouche. 



Elm, Lecanium ulmi, Lin. 



Ferns, Lecanium filicum, Boisd. 



Fescue grass, Lecanopsis radicum graminis, Baer. 



Fig, Mytilaspis ficus, Sign. 



Furze, Aspidiotus ulicis, Sign., Lecanium genistce, Sign. 



Grass roots, Aclerda suhterranea, Sign., Fairmairia bipartita, Sign. 



Guelder rose, Lichtensia viburni, Sign. 



Hawthorn, Aspid. oxyacanthcs, Sign., Lee. bituberculatum, Targ. 



Hornbeam, Pulvinaria carpini, Lin. 



Horse-cheetnut, Aspid. hippocastani, Sign. 



