140 SELIDOSEMA PLUMARIA. 
General colour uniformly pale stone-grey ; head of 
the same colour, with a dark crescentic mark sur- 
mounting each mandible, and another dark brown 
crescentic mark above these; the mandibles are brown, 
of a still darker shade. A double, very dark brown, 
almost black, line extends through the dorsal area; 
on the anterior segments it 1s paler and more uniform, 
but after it reaches the fifth it becomes swollen and 
darker in the middle of each segment, which gives it 
a conspicuous and rather interrupted appearance ; 
subdorsal and spiracular lines pale grey, the latter 
rather prettily edged above and below with chocolate- 
brown, the brown being most noticeable on the 
anterior segments; the spiracles, and four very dis- 
tinct dots on the dorsal area on each segment, 
intensely black. 
Ground colour of the ventral surface of a yellower 
grey than the dorsal area; it has a broad central pale 
erey band, enclosing a ane double reddish-brown line; 
outside the band, but adjoining it, on the sixth, seventh, 
eighth, ninth, and tenth segments, is a conspicuous 
dark smoky mark; and between the central band and 
the spiracular region is another faint pale line. 
About the middle of April the first went below the 
surface, and the moths emerged at the end of July. 
(George T. Porritt, October 4th, 1878; H.M.M., 
November, 1878, XV, 137.) 
FIDONIA ATOMARIA. 
Plate CXXII, fig. 4. 
Two larve found feeding on Lythrum salicaria, 
kindly sent me in 1868 by Mr. W. H. Jeffrey from 
Wicken Fen, produced this species on the 28th of 
May, 1869. 
| The larvee arrived, and one of them was Aearca on 
the 14th of August, 1868. Both being alike, and 
differmg from some of the varieties of this variable 
