THE BRITISH WOODLICE. 39 
Cylisticus convexus De Geer. PLaTE XXI. 
1778 
1833 
1836 
1853 
1853 
1868 
1898 
Oniscus convexus De Geer (10), p. 553, pl. XXXV.,, fig, 11. 
Porcellio spinifrons Brandt (3), p. 177- 
Porcellio laevis Koch (34), part 6, pl. I. 
Porcellio armadilloides Lereboullet fe p. 65, pl. I., fig. 18. 
Cylisticus laevis Schnitzler (65), p. 2 
Porcellio armadilloides Bate and Winetwosd (rt), p. 485. 
Cylisticus convexus Sars (59), p. 186, p. LAXXI, 
There is but a single species of Cylisticus found in this 
country, so that it isnot necessary for us to go into much further 
detail with regard to it. Cylisticus convexus has 
the two joints of the flagellum about equal, and 
they together in turn closely approximate in 
length to the last joint of the peduncle. Mr. 
Stebbing says, in a letter, that British examples 
do not appear to have the ‘‘ white tail-piece”’ 
seen in Continental ones. It is not noticeable 
in the preserved specimens which we have seen 
from Berkhamsted and Leixlip, but it is very 
evident in the living ones found at Hanwell and 
Maidstone. 
The abdominal appendages 1 to 5 are 
provided with 
BRITISH LOCALITIES :— 
England: Maldon ; (W.M.W. from R.M.): 
air-tubes. 
Hanwell; Bluebell Hill, Maidstone; Eton; 
(W.M.W.): Berkhamsted ; Portland;(Norman, axpusstPepuncuta 
49) 
AND LAST PEDUNCULAR 
JOINT OF THE ANTENNA 
oF Cylisticus convexus. 
Scotland: Salisbury Crags; Edinburgh ; Lan- 
arkshire ; Rothesay; (Scott, 68): Killwinning; (John Smith fide 
Robertson, 57): 
Highgate; (Bate and Westwood, 1). 
Iveland: Leixlip, Co. Dublin; Tempo, Co. Fermanagh ; 
Goresbridge, Co, Kilkenny ; (R.F.S.) 
FOREIGN DISTRIBUTION .— 
Europe: France; (25): Sweden; Norway ; Denmark; Germany; Bohemia ; 
Holland ; Belgium; Turkey ; Caucasus ; (59). 
North America ; (59). 
