THE GENERA OF BRITISH MOTHS. 87 
PLATE XXXV. 
No. 1.—The Large Emerald (Geometra Papilionaria). No. 6.—The Caterpillar of the Grass Emerald. 
No. 2.—The Caterpillar of the Large Emerald. No. 7.—The Essex Emerald (Luchloris Smaragdaria). 
No. 3.—The Small Emerald (Jodis Vernaria). No. §.—The Blotched Emerald (Comibena Bajularia). 
No, 4.—The Caterpillar of the Small Emerald. No, 9.—The Caterpillar of the Blotched Emerald, 
No. 5.—The Grass Emerald (Pseudoterpna Cythisaria). 
Tu sub-family illustrated in this Plate is that of the Geometridi. It contains five genera : Geometra, 
Jodis, Pseudoterpna, Euchloris, and Comibena; and comprises nearly all the Moths popularly known as the 
“« Emeralds,” 
The genus Geometra. The insects assigned to this genus have the antenne of the males pectinated, 
the abdomen smooth and small, the wings large, and the hind-wings generally scalloped at the fringed edge. 
The larve are short, and generally small in proportion to the perfect insect. The pupa is enclosed in a 
transparent cocoon. 
Geometra Papilionaria (the Large Emerald, No. 1) is one of the handsomest of the small bodied Moths of 
this group, and fresh specimens are remarkably handsome, being of a brilliant grass or emerald green ; but the 
brightness of this colour fades very rapidly, and this insect as seen in Collections exhibits but a faint tinge of its 
original colour, The Caterpillar (No. 2) feeds on Birch, Nut, Beech, and other trees, and the Moth appears in 
July. It is rarely found except in woods. The neighbourhood of Bristol is cited for its recent capture in some 
abundance ; and it may be said to be very widely distributed, even as far north as Dumbartonshire and Renfrewshire. 
The insects assigned to the genus Jodis are of much smaller size than the preceding. They are distinguished 
by having the antennz of the males only slightly pectinated and filiform at the points, and by very slender palpi. 
The Caterpillars are free from protuberances, and, with their regular longitudinal stripes and bifid head, are very 
distinct from those of the preceding genus. 
Jodis Vernaria (the Small Emerald, No. 8), This very pretty species is of a bright but whitish green, very 
difficult to imitate in a drawing. The Caterpillar (No. 4) feeds on Oak and other trees, and the Moth appears in 
July. It is most frequently found on chalky soils, but may be considered rare ; but in recent years it has been 
taken commonly near Bristol. 
Some English authors describe a second species, smaller, and of a paler and still more delicate green ; this 
is J. Lactearia, 
The genus Pscudoterpna. The insects assigned to this genus have the antenne of the male slightly 
pectinated ; and the abdomen is crested in both sexes on the third and fourth segments. The larva is very rigid, 
has two excrescent points on the second and last segments, and the head is bifid. The Chrysalis is green, and 
enclosed in a slightly webbed cocoon, There is but one British species. 
, Pseudoterpna Cythisaria (the Grass Emerald, No. 5) is a common insect in favourable localities. It is of 
