Zygena Trifolii. 439 
in which is placed the black spiracles, the posterior spot 
emitting a small transverse spot towards the pro-legs (the 
‘little tail? of Mr. Buckler); below which the lower 
narrow lateral line, below which a row of dusky patches 
of a lunate form, sometimes bearing a small transverse 
lunule ; another dusky patch on the base of the feet ; 
pro-legs and underside pale, but often irregularly suf- 
fused with dusky markings, the upper part of the anterior 
segment is narrowly margined with blackish. 
Described in June, 1866, from some larve sent me 
from Tarrington. Found on Tarrington Common, feed- 
ing on Birds’-foot Trefoil. 
This larva seems to have a certain range of variation, 
as is evidenced by the two varieties described by Mr. 
Buckler. The latter of which varieties agrees exactly 
with the above description (see Ent. Mo. Mag. iv. 253) ; 
it will be observed that this variety that agrees so exactly 
well with my description, was found feeding on the same 
food-plant, Lotus corniculatus. The question naturally 
suggests itself, does the variation in the larva depend on 
the food plant. It is odd that the caterpillar of the late 
Trifolii always found on the same plant should be so 
constant. 
As to the very different larvee, resembling the early 
Trifolii before mentioned, as I only bred one moth (rest 
died in pupa), it is useless to attempt an opinion; the 
moth may be a mimic. 
No. 3. Larva of a Zygcena, supposed to be the ordinary 
Trifolit. 
Body with short white hairs scattered over it, with a 
very few black hairs on the back; head and pro-legs 
black ; head with transverse upper-lip, and membrane at 
base of antenne, white; ground-colour pale yellowish, 
arranged in five lines, one dorsal and two lateral on either 
side; on each side of the dorsal line, a row of large black 
spots, two on each segment, confluent or nearly so, but 
each coming to a point on the back, which makes the 
dorsal line look like a row of transverse lozenge-shaped spots 
on the middle of the back of each segment, preceded and 
followed by semi-lozenge-shaped spots, which unite (or 
