92 {September, — 
Length: nearly an inch and a half, cylindrical, very slender, and tapering 
slightly towards the head. Head not notched on the crown, about as wide as, per- 
haps a little wider than, the second segment; the face slightly flattened, and the 
cheeks globular. Skin ribbed transversely, which gives it a rather rough, though 
uniform appearance. 
The ground colour is grey, tinged with green ; the head grey, faintly variegated 
with very pale brown. Of the longitudinal stripes, the most distinct is the narrow, 
dull green, nfedio-dorsal line; the sub-dorsal and spiracular lines are very incon- 
spicuous, and seem to be composed of confused, waved, faint brown lines; spiracles 
very small, brown. On the centre of the back, and on the extreme anterior 
edge of the 6th, 7th, 8th, and 9th segments, is an intensely black square mark, 
divided into two distinct spots by the medio-dorsal line passing through the 
centre: slightly in front of each of these marks are two other equally black, 
but smaller dots, one being a little to the right, the other to the left, and placed at 
the posterior edge of the segments. The belly is pale greenish-grey, with a still 
paler central stripe, and on each side of this stripe are one or two very faint, pale 
brown, zigzag, longitudinal lines. In the middle of June it spun its cocoon (which 
was more firmly constructed than those of other species of the genus I have had) 
at the foot of the knot-grass on which it had been feeding.—Gnro. T. Porrirr, Hud- 
dersfield, July 13th, 1871. 
_ Re-occurrence of Aplasta ononaria at Folkestone.—I had the pleasure of taking 
Aplasta ononaria (a fine female) here on Monday last.—Wwm. PurDEyY, 15, Grove Ter- 
race, Folkestone, June 23rd, 1871. 
Butalis cicadella at Weybridge.—On Saturday, the Ist July, I caught, I may 
say accidentally, an example of this exceedingly rare British species, on the heath 
near Weybridge Station. I believe specimens have been taken by Mr. 8. Stevens, 
but I know not the locality. The original individual was taken at Brandon, Suffolk, 
many years since, by Mr. Dunning.—R. McLacuian, Lewisham, 10th July, 1871. 
On the habits of the larva of Mycetobia pallipes, Meigen (Diptera).—I have 
several times found this larva under the bark of large fallen pine-trees, which have 
been infested by the larvee of Tomicus stenographus. It is met with among the 
detritus and excrement left by these larye, and often in company with that of a 
Xylota, and of Rhyphus fenestralis. Without these larvee the detritus would become 
dry ; their presence turns it into a kind of mucilaginous paste in which they 
swim and wriggle. Lyonnet found the larva of the Mycetobia in the humid mould 
of willows, Léon Dufour in the morbid secretions of the ulcerated wounds of elms. 
I have myself found it in the wounds of pear and apple-trees produced by the 
caterpillars of Zenzera esculi. Thus one sees that it always lives under similar 
conditions, without regard to the kind of tree in which those conditions are re- 
alised. 
When, being under the bark, it wishes to change to a pupa, it seeks the gallery . 
of the Tomicus, and follows it until it arrives at the exit hole. Close to this hole, 
or sometimes in its interior, it undergoes its final change, so that the perfect insect, 
incapable of piercing the bark, finds an easy exit.—K. Perris (‘ Insectes du Pin 
Maritime,’—Diptéres), in Ann. Soc. Ent. de France, 1870, pp. 188—189. 
