ACCOUNT OF COLLEMBOLA AND THYSANURA. 119
Paratullbergia concolor mihi. A single specimen of this new
species was found under loose bark. The genus and species
were described in Annals and Mag. Nat. Hist., Ser. 10, vol. vi.,
p. 149, July, 1930.
Family: Entomobryidae D.T.
Sub-family: Isotominae Tom.
Isotoma (Vertagopus) cinerea Nia A bluish black species,
common under bark.
Isotoma minor Schffr. A small white blind species. Was very
plentiful in the leaf-carpet.
Isotoma viridis Bourl. Common under bark.
Sub-family: Tomocerinae (Schffr. Borner).
Tomocerus minor Lubb. A common black species under bark;
scaled. When rubbed yellowish.
Sub-family: Entomobryinae Schffr.
Isotomurus palustris Mull, The variety trifasciata Bourl.
(aquatilis Lubb.) has been taken by Mr. Scourfield on the
surface of ponds.
Entomobrya albocincta Tempi. Common under bark.
Entomobrya multifasciata Tlbg. Common under bark.
Lepidocyrtus cyaneus Linn. A scaled form with bluish iridescence.
Common under bark.
Lepidocyrtus lanuginosus Bourl. Common under bark.
Orchesella cincta Lubb. A large and striking species. Common
under bark.
Cyphoderus albinos Nic. A white blind species only found in
ants' nests.
Sub-order: Symphypleona Borner.
Family: Sminthuridae Lubb.
Sub-family: Sminthuridinae Borner.
Sminthurides aquaticus Bourl. Taken by Mr. Scourfield on the
surface of ponds.
Sub-family: Sminthurinae Bourl.
Sminthurinus aureus Lubb. A yellow species. Scarce in moss.
Sub-family: Dicyrtominae Borner.
Dicyrtomina minuta O.F. form ornata Lubb. Plentiful on fallen
branches.
The Thysanura or Bristle-tails comprise four very different
families, only three of which are represented in Britain. These
are the Machilidae, Lepismatidae and Campodidae. The first