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Scolytus intricatus, Ratz., (Oak Bark Beetle).—This species 
is common throughout the gardens on various oaks and on sweet 
chestnut. 
Scolytus rugulosus, Ratz., (Small Fruit-tree Bark Beetle),.— 
Common on various fruit trees in the Director’s Orchard, and on 
Prunus Padus in the Upper Nursery, 1922. 
Hylesinus fraxini, Panz., (Ash Bark Beetle).—Probably 
common on Fraxinus in Queen’s Cottage Grounds and on lilac 
(Syringa vulgaris), 1922. 
Hylesinus vittatus, F'., (Elm Hylesinus).—On elm along with 
Magdalis armigera. 
Phloeosinus thujae, Perris, (Thuya Bark Beetle)—Found on 
Thuya orientalis near the Cumberland Gate, July 1922. Not 
previously recorded for Britain, and on Cypsressus pisifera, 
July 1922. 
Myelophilus piniperda, L., (Pine-shoot Beetle)—Not un- 
common in the Pinetum. 
Hylurgops palliatus, Gyll., (Brown Pine Beetle)—On pine 
_ and spruce logs in the Stable Yard. 
ylastes ater, Payk., (Black Pine Beetle)—On pine logs 
in the Stable Yard. 
Dryocaetes villosus, F.—On oak and sweet chestnut in 
Queen’s Cottage Grounds. 
Cryphalus (Ernoporus) fagi, F., (Beech Bark Beetle)—On 
beech twigs and branches throughout the gardens. Until recently 
this species was considered rare in England. Mr. Chrystal finds 
it abundant in Epping Forest and the writer has recently found 
it near Wotton in Surrey. 
halus abietis, Ratz., (Fir Bark Beetle).—Its galleries 
have been found on Abies spp. 
Pityogenes bidentatus, Hbst.—On Pinus spp. in the Pinetum 
and Stable Yard. 
Pityogenes cographus, L.—On scaffold-poles in the Stable 
Yard. Undoubtedly an importation. Not established in the 
Gardens. 
Pityophthorus pubescens, Marsh——On pine twigs in the 
Pinetum. 
Xyleborus saxeseni, Ratz.—On cherry trees in the Director’s 
Orchard, on oak, sweet chestnut and beech in Queen’s Cottage 
Grounds and on a Catalpa log from the Gardens. 
Trypodendron domesticum, L.—On oak and beech logs in the 
Stable Yard. eS ae 
This list is probably incomplete but it is interesting in that 
with the exception of Pityogenes chalcographus and the possible 
exception of Phloeosinus thujae it contains no exotic species and 
no peculiarly northern species. All the above bark beetles 
except for the two species named are more or less common in 
Surrey and the South of England generally. As might be 
expected some of the host trees recorded for certain species are 
unusual. Thus lilac is not a usual host in Britain for Hylesinus 
