384 THE ENTOMOLOGIST. 
being crowded into the least possible space, and together 
with the head combining to form a mass the component parts 
of which are undistinguishable: the body is cylindrical, 
excepting that the back of the 2nd segment has two pointed 
projections placed transversely, and having the same direction 
as those of the head; moreover, each side of the body is 
dilated into a slight skinfold, and the dorsal surface is slightly 
wrinkled; the anal flap is pointed at the extremity, and has > 
its margins slightly recurved; every part of the skin is deli- 
cately shagreened, or covered with minute sessile granulations ; 
the colour of the head, as well as the legs, is pale purplish 
brown; that of the body apple-green, with a medio-dorsal 
series of purple-brown markings, almost a medio-dorsal stripe, 
excepting that it is interrupted at the middle of each 
segment; the lateral margins of these markings is decidedly 
paler, and has a bleached appearance; the lateral skinfold is 
yellowish, the granulations being still paler, and imparting to 
the sides a frosted appearance. I am indebted to Mr. Hodg- 
kinson for a specimen of this larva, which he found feeding 
on Salix viminalis (the narrow-leaved or basket-willow or 
osier). Two doubts have been suggested with regard to this 
insect: first, whether the specimens, as now arranged in our 
cabinets, constitute a single species or two species; and 
secondly, whether either of these is the Phalena viridata of 
Linneus. With regard to the first of these doubts it may be 
observed, that Zeller has proposed, and Herrich-Scheeffer has 
figured, two supposed species, under the names of Viridaria 
(fig. 567) and Porrinaria (fig. 566): Viridaria is represented 
as having a tendency to slightly pointed and slightly falcate 
fore wings, and as having their costa ochreous or pale brown ; 
while Porrinaria has no tendency to the pointed and falcate _ 
form, and has the costa perfectly concolorous with the disk 
of the wings, but the abdomen is tipped with ochreous. 
Guenée is unwilling to express any opinion on this question, 
not having seen specimens named by the authors themselves. 
My own specimens, ten in number, which are decidedly 
faded, as these green geometers will fade, have the costa 
slightly reflexed or turned over towards the upper surface of 
the disk of the wing (which is, indeed, a very common result 
of drying}, thus catching the light, and they certainly exhibit 
an ochreous margin; in the outline of the wing there is a 
