1870.} 89 
the leaflet forms the inner wall of the cavity, whilst under the irritation of the 
suction of the larva from within and under the solar influence, the outer (i. e., the 
under-side of the leaf) becomes red and bloated, forming a series of bosses between 
the lateral ribs. I have seen from 3 to 10 larva in one of these pod-shaped folds. 
Bremi has figured and described an almost identical formation on the same 
rose found in Switzerland (Beitraege z. e. Monographie der Gallmuecken, 1847, 
p: 27, et tab. ii, fig. 31); but, as he mentions that the larve he found in it were 
pale green, I apprehend that my British larvee will turn out to belong to a species 
other than his Cecidomyia rose,and which I do not believe has ever been described. 
In June of the present year, near Godalming in Surrey, and also in this neigh- 
bourhood, I met with oak leaves, some lobes of which were neatly folded and laid 
down on the under-side, forming a snug hollow covering for two or three greenish- 
white small larvze of a Cecidomyia. The folds were of a paler colour than the leaf 
itself, and therefore easily detected. An adult larva was a line in length, white, 
with green intestine, its first segment slender and beak-like, the breast bone well 
marked and pale yellow. In one fold, found here (12th June), I met with two of 
the minute, elongate, white, and semi-transparent eggs of this species, fixed to 
the surface by one end, and standing upright. 
Similar folds, also caused by Cecidomyian larvz, occur on Onobrychis sativa, and 
on various species of Trifolium ; and, if the present notice should induce any observer 
to turn his energies in the direction of the hitherto neglected study of leaf-folding 
Diptera, I shall not have written it in vain.—ALBERT Mutier, South Norwood, 8.E., 
9th August, 1870. 
Cecidomyia terminalis, Loew, pruning the top-shoots of Salix fragilis.—Last 
summer I recorded the action of C. salicina on the top-shoots of Saliw alba (Ent. 
Mon. Mag., Vol. vi, p. 109). During last July I have had occasion to watch the 
operation of an allied species, C. terminalis, Loew, the eggs of which, to the number 
of 20 or 380, arelaid in the tops of the most prosperous shoots of C. fragilis. Each 
shoot so provided remains stationary in growth, the top assuming a close and galled 
appearance, and sheltering within its bloated leaflets the numerous reddish-yellow 
larvze, which have emerged from the saideggs. The larval state lasts about a fort- 
night : an equal period suffices for the pupal stage, which is passed under ground, 
and the perfect insects force their way out of the pupal integument in the usual 
way. Very soon after the larvez have left the shoots, the tops rapidly wither away 
and turn brown; at the junction between the healthy part and the galled top, a 
series of minute woody cells covers the surface of the shoot, and gives it the 
appearance of a closed scar; in fact, it is the same process which causes the 
autumnal shedding of the healthy leaf and the fall of ripe fruit. The scars look as 
if cut with a sharp pruning knife; and I recognize, in the operation of this minute 
gall-midge, one of the potent agencies which check the undue growth of a tree, 
the easy and rapid propagation of which has almost become proverbial.—In. 
Obituary. 
Professor Lacordaire.—Jean Théodore Lacordaire was born at Recey-sur-Ource 
(Céte d’Or), France, on the 1st February, 1801, and was educated in the Lyceum 
at Dijon, in which town he also appears to have studied for the legal profession 
But his inclinations for Natural History caused him to travel in South America, that 
continent in which nature is most prodigal, and between 1825 and 1832 he made 
