422 Mr. T. H. Briggs on 
Tn typical specimens the fore-wings are of a very brilliant 
green, with the red spots large, and generally with the 
central pair more or less united, especially in the ¢. 
In the male all the spots often coalesce and form one 
band, but this rarely occurs in the ¢. Hind-wings 
bright deep red, with a broad black border, slightly 
sinuate on the inner margin; the border is broader 
in the ¢ than im the ¢. 
Larva fully described in the appendix to this paper as 
Zygena, No. 1 (Lrifolii). 
The insect is found in marshy places ; the caterpillar 
feeds on the large sort of Trefoil that grows among the 
rushes, often attaining the height of a foot, or more. 
The insect is exceedingly local, generally being confined 
to one little spot only. 
Time of appearance of perfect imsect varies from 
the second week in June to the second week in July, 
according to the season, but always about one month later 
than the neat described species; 1t appears at the same 
time as Filipendule. 
I have never yet found this insect in company with 
Z. Filipendule ; it is apparently rarer than the next species. 
In most collections I have found the males of this species 
classed as curious varieties of Vrifolii, or as Lonicere 
with the spots confluent ; the females I have found nearly 
always classed as typical Lonicere. 
It is distmguished from 7'rifolit usually so-called (the 
next species), by its size, its larva, its locality, its food 
plant, and especially by its time of appearance. 
(4.) Zygena Trifoli. 
(The small form, hereinafter called ‘the early T'rifoliz.’) 
This is the insect usually known as T’rifolii ; expans. 
alar. I’ 2” to 1’ 3”. Antennz almost as thick as in the 
last species. Head much more densely clothed with hairs. 
In typical specimens the fore-wings are of a darker green 
than in any other species, with the central spots small 
and disunited, but in some colonies the confluent spots 
are of common occurrence. Hind-wings dark red, in 
some specimens quite crimson, with a much broader black 
border than in any other British species ; with a tendency 
to no sinuation on the inner margin, but to a uniform 
breadth throughout. 
