238 BOTANICAL GAZETTE [SEPTEMBER 
in which they describe 50 specimens, most of which are caused by insects of 
the genus Cecidomyia. This material was collected in the Oengaran moun- 
tains at an elevation of 700 to 1000 meters. Large, soft galls with water 
parenchyma were especially abundant. 
TROTTER™ gives brief descriptions of 24 species of galls collected by Dr. 
Forti in Asia Minor, and occurring on Quercus aegilops L. (Q. vallonea Kosch.), 
Q. lusitanica Lan., and Rosa sp. Most of these species had already been 
described. 
KIeFrrerR (Bitsch) and Hersst (Valparaiso)™ describe seven new species 
of cecidia and insects producing them, from Chile, and give brief descriptions 
of those species not previously described. 
Among the papers on American cecidology we note FELT’s” key, parts of 
which will be serviceable to the botanist as well as to the entomologist, but 
there are not enough characters of the galls given to enable exact determi- 
nations. 
1TH _M. PATCH’ gives a most excellent piece of work on the aphis galls 
of the elms. Although, with the exception of brief descriptions of the galls, 
the major part of the work is devoted to the biology and life history of the 
insects, the work is of great value to the botanist. Several species which have 
previously been very much confused are separated in a manner which makes 
them easily omanreng The value of the work is increased by the illus- 
trations and bibliographies 
SmitH’s™ bulletin comes to us as a valuable contribution on bacterio- 
cecidia. The historical discussion and the long series of experiments are 
interesting and valuable. It is very doubtful if any cecidia have a wider 
range of host plants than has been proven for this one. The fact that the 
galls are produced most readily in soft, rapidly growing tissues, is in harmony 
with results already obtained by the study of insect cecidia, and further 
studies will doubtless bring out other similarities. The very limited dis- 
cussion given to the stimulus and to the character of the cecidia leads us to 
hope for another bulletin in which these phases of the subject will receive 
more attention. 
Norton’ records a very interesting crown swelling of the peach due to 
to TROTTER, * oo di Galle Roccolte dal Dr. A. Fortr in Asia Minor. Mar- 
sm - a 
und Hersst, P., heigl sa und Gallenthiere aus Chile. 
ak f Bak, Wats u. Infek. 29: 606- 
» Pett, BP. ae midges of Aster, ey one and Salix. Jour. Econom. 
Ent. ba sara 
= gat ‘ , Gall aphids of the elm. Bull. No. 181, Maine Agric. Experi- 
ment Nealon IgII 
4 Smita, E. F,, Brown, N. A., and Townsenp, C. O., Crown gall of plants; 
its cause and remedy. Bur. Plant Industry, Bulletin 213. rg1t. 
*s Norton, J. B. S., Crown swelling disease of peach. Phytopathology 1:53, 
54- 1911. 
