106 THE BRITISH WOODLICE.
are explored in which no collecting has been done, we may
briefly indicate the results which we obtained in the county in
question.
It was not long before a species new to Britain—to wit,
Porcellio ratzeburgii—was found (74). This discovery was men-
tioned by Mr. Stebbing in the Victoria County History of Essex
(p. 71), and he prophesied that most of the British species then
would be met with in the county. We may safely claim to have
shown that his prediction was true, for we have been able to
record in the preceding pages no less than sixteen other species,
as will be seen from the following lists :—
WOODLICE RECORDED FROM ESSEX.
1. Ligia oceanica
2. Ligidium hypnorum
3. Trichoniscus pusillus
4. Trichoniscus roseus
5. Haplophthalmus danicus
6. Oniscus asellus
7. Philoscia muscorum
8. Platyarthrus hoffmannseggii
9. Porcellio scaber
10. Porcellio pictus
11. Porcellio dilatatus
12. Porcellio laevis
13. Porcellio ratzeburgii
14. Metoponorthus pruinosus
15. Cylisticus convexus
16. Armadillidium nasatum
17. Armadillidium vulgare
Of these Ligidium hypnorum calls for special mention, as it
had not been found in this country since Mr. Stebbing discovered
it in Surrey in 1873. Several of the Porcellios and Cylisticus
convexus have been met with in but few places, and the same may
be said of Armadillidium nasatum.
Of the British species not as yet found in, Essex Trichoniscus
vividus has at present only been recorded from Ireland ; Philoscia
conchii and Armadillidium depressum have not been collected
except in the extreme south west of England, while
Metoponorthus cingendus has hitherto only been noticed in
Devonshire and Ireland. The other four species, with the
exception of Porcellio rathkei, which is well distributed in west
Middlesex (and might have been expected to occur in Essex),
are still rare. In fact, for Trichoniscoides albidus but two British
localities are known ; for Haplophthalmus mengii three (two in
England and one in Ireland); while Armadillidium pulchellum has
only been recorded from two or three places.
In other counties quite as satisfactory results were obtained
as in Essex—a systematic search in Buckinghamshire brought to