438 Mr. T. H. Briggs on 
of smaller spots in Filipendule, so as to make all the lines 
broader, and you will have a specimen of this caterpillar. 
As the variation in Filipendule tends towards con- 
fluence, the variation here is towards obliteration ; but the 
caterpillar is very constant, its range of variation very 
small, as the limit towards magiitude of the spots in this 
species is attained before the limit of Filipendule towards 
obliteration commences ; it follows, as a matter of course, 
that I have never seen any tendency towards the x -lhke 
dorsal markings, or ever seen the lateral spots united.* 
Larva of Zygena, No. 2 (Lonicere) . 
Body with long white hairs scattered over it, with some 
black hairs mixed with the white on the back, hairs 
much longer and more dense than in the other species ; 
head and fore-legs black, head with transverse upper-lip, 
membrane at base of antenne, and articulations of lower 
organs of the mouth, white ; ground-colour arranged in 
five lines, one dorsal and two lateral on either side; very 
pale yellowish tinged with green, sometimes quite green ; 
dorsal line slightly yellowish in the fold formed by the 
hind margin of each segment, and rather narrow, not 
being nearly as broad as in the last species (the late 
Trifolii); on each side of the dorsal line a row of large 
black spots, two on each segment which almost meet, 
and in some cases are confluent; the anterior is shghtly 
the larger, but there is very little difference im size, both 
being somewhat pear-shaped; the anterior with the 
larger portion below, the posterior with the larger portion 
above, leaving a small pale angulate space in the middle 
of the back of each segment; below which row of spots a 
narrow pale line with a very conspicuous bright yellow spot 
in the fold formed by the hind margin of each segment, 
below which line another row of black spots on each side, 
two on each segment, united in their lower extremities, 
* Filipendule is widely distributed, and its larva feeds on many plants ; 
the larva is very variable. Zygena (No. 1) is very local, and its larva 
feeds, so far as I know, on one plant only; its larva is very constant. 
Are these facts coincidental or explanatory? I forgot to observe, as a 
further proof of distinctness between this species and the early Trifolit, 
that some larva I tried to feed on Birds’-foot Trefoil, wasted away, and 
died.—T. H. B. 
