The Zoologist— May, 1868. 1201 



Small woody cones, standing mostty along the midrib of the leaf, 

 one line high, on upper surface ; whilst the under side of the leaf 

 shows only raised tubercles in the same spots, which latter are pierced, 

 when the larva leaves the gall. Cecidomyia bifrons, Bremi? Locality: 

 Radolfszell, August, 1867. 



Specimens of both the preceding galls were sent to me by Mr. C. 

 Schaffner. 



Bcsch (Fagus sylvatica). — The woody conical gall with a pointed 

 apex, produced by the Cecidomyia Fagi of Hartig, has reached me 

 from so many localities in Switzerland and Germany that I am inclined 

 to think with Bremi, that it is well nigh as widely distributed as the 

 tree itself. Besides it is so well known that any comments would be 

 superfluous, so I only just mention that the specimens exhibited by 

 Mr. Saunders before the Entomological Society of London on the 7th 

 of November, 1864, belong to it, and that Mr. Armistead has met with, 

 the thin vermiform summer gall pertaining to this species near Harro- 

 gate, in September, 1866. 



Tubular galls, height from one to two lines, covered with a red* 

 dish pubescence on the upper side of the leaf, standing almost all 

 along the midrib. These I found near West Wickham on the 1st of 

 October, 1865, commonly, mostly on sheltered branches of the beech* 

 Insect unknown to me. 



On the trunks of beech 1 find woody, hard, knob-like rounded 

 excrescences of about the size of a marble. On being detached their 

 under side shows concentric rings of growth. Shirley, May, 1866. 

 Rennie ('Insect Architecture,' p. 339) supposes them to be produced 

 by one of the Curculionidae, but I have never been able to detect any 

 trace of insects in or near them. Is this production allied to the 

 "black-knot" of American authors ? 



Box (Buxus sempervirens). — Small, flat, round dark brown ex- 

 crescences, of half a line in diameter, both on the upper and under 

 side of box-leaves. " Were sent to me by a friend in Hampshire." — 

 W. A. in lilt. April 7, 1866. I am inclined to refer these excrescences 

 to an Acarus, possibly a Cephaloneum. 



Common Bracken (Pteris aquilina). — Leaflets discoloured, either 

 reddish or black, rolled up or- otherwise distorted. " Are very common 

 here, Allonby, Cumberland."— W. A. in litt. August 9, 1867. 



Celtis auslralis. — Flat, rounded, mine-like blisters, one to two lines 

 in diameter, slightly raised on both sides of the leaf, as many as from 

 fifty to sixty blisters on the same leaf, which is attacked in all stages 



SECOND SERIES— VOL. III. 2 A 



