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XII. Notes on the Thysanura.— Part 1%: 
By Sir Joux. LuBBocKk, Bart., F.R.S., V.-P. Linn. Soc., fe. 
(Plates XLV. & XLVI.) 
Read June 3rd, 1869. 
SINCE my last paper on the Thysanura, which was read before the Linnean Society in 
1867, I have met with six more British species, three of which have been already 
recorded as occurring on the Continent, while the others appear to have been hitherto 
overlooked. The first three are Lepidocyrtus curvicollis Bourlet, Degeeria domestica 
Nicolet, and Lipura maritima Guérin; the fourth is a species allied to D. domestica, the 
fifth an Isotoma, which I propose to name Jsotoma grisea; and the sixth forms the type of 
a new genus. In placing on record the existence of Nicolet’s Degeeria domestica as a 
British species, I must add that I have never found it myself, but have received 
. specimens from. Mr. M‘Intire, and that, for reasons given below, I cannot regard it as 
belonging to the genus Degeeria, but rather as constituting the type of a separate genus 
of much interest as being in some respects intermediate between Templetonia, Lepido- 
cyrtus, and Degeeria. It has the hairs and scales of Lepidocyrtus and Templetonia, and | 
the general form of Templetonia and Degeeria, from the former of which, however, it 
differs in its antenne. 
I also add descriptions of the only three British species of Lepismidæ with which I 
am acquainted. 
LEPIDOCYRTUS CURVICOLLIS Bourlet. : | 
Lepidocyrtus curvicollis Bourlet, Mém. Soc. R. Lille, 1839 ; Mém. Soc. Douai, 1842. 
Cyphodeirus capucinus Nicolet, Mém. Soc. Helv. 1842. 
Lepidocyrtus curvicollis Gervais, Hist. Ins. Aptères. 
capucinus Gervais, Hist. Ins. Aptères. 
. Bourlet's description of this species is as follows :— 
“ Thorace gibboso, capite deflexo, corpore toto squamis plumbeis. 
“2 millim. 3. Mémes caractères que ci-dessus. Sous les pierres et le bois pourri, en 
tout temps, excepté l'hiver ". 
I have found a few specimens belonging apparently to this species, and have also 
received some from Mr. M‘Intire. In its ordinary position the head is completely hidden 
by the projecting bars of the thorax. It seems to me to be identical with the Cyphodei- 
rus capucinus of Nicolet, whose description 1 subjoin. : : 
“ Entièrement d'un jaune orangé, sauf les antennes, dont les deux p articles sont 
d'un jaune plus pále, et les deux derniers d'un gris assez foncé. "cam cylindrique, 
luisant, peu velu, à poils très-courts. Premier segment tres-allongé antérieurement, 
triangulaire, creux en dessous et recouvrant la téte de maniere à n'en laisser voir 
