Zygena Trifolit. 433 
the first, of the greenish ground colour, and the orange 
spot, but no mention of the “little tail;”’ but in a draw- 
ing Mr. Buckler has kindly sent me of a segment of one 
of the variety found feeding on Lathyrus pratensis, this 
little tail is accurately delineated. Mr. Buckler has 
kindly given me all the information in his power, and 
has sent me diagrams of the 6th segment in T'rifolii, Loni- 
cere, and Filipendule; this diagram of T'rifolii differs 
from my marsh Trifolii altogether, having the lateral 
spots united below, and the tendency to the x -shaped 
dorsal spots. 
Now then, to sum up. Of the 5-spotted species in 
the imagos, we have Lonicere distinguished by its slender 
antenne; a Zygena equally as large as Lonicere, appear- 
ing about the same time, found in marshes; and a Zy- 
gena found in dry places, appearing a month before the 
marsh one, and usually known as 1'rifolit. 
I have found no intermediate time of appearance, in 
the four colonies I have especially observed ; in Hunting- 
donshire, Oxfordshire, Sussex, and Kent, the early 7’ri- 
folii in the most northern and most southern locality, 
has appeared simultaneously; and also the late T’'rifolir 
in the two intermediate localities, the early Trifolii always 
about one month before the other, and this invariably 
the case in the course of eight years’ observation of the 
colonies. Is not this fact alone opposed to the supposi- 
tion of their being simply “ forms” of each other ? 
As regards the caterpillars, the salient points of differ- 
ence in Lonicere have been observed by Boisduval, and 
seem to be the same now as the “ point jaune” is dis- 
tinctly observed by Mr. Buckler and myself. 
Of the two T’rifolii—one has the spots very small, and 
never * any tendency to the x -like spots, and never has 
the lateral spots united ; the other has the spots invariably 
larger, lateral spots nearly united, and a more or less 
tendency to confluency in the dorsal spots, and the as- 
sumption of the x-like form. I have not seen any 
intermediate form of caterpillar in 7’rifolii, there is agap, 
but Filipendule larva has a range of variation extending 
* During the period 1864-1871, I have examined some hundreds.— 
“iy T. H 
TRANS. ENT. soc. 1871.—PART IV. (DECEMBER.) HH 
