1893.] Entomology. 905 
The larval gallery in one gall was 5 mm. long, by 1 mm. wide. In 
the other two galls there was nothing but the short terminal cell in 
which the pupa had lodged until it transformed, being just large 
enough for its accommodation, the larval gallery having evidently 
been lost and absorbed during the growth of the twig. In fact, the 
pressure of the growth was so great that the impression of the pupa 
was left in the walls of the cell. 
—C. H. TYLER TOWNSEND. 
A Woolly Leaf-gall on Oak near Grand Canon.—On the ap- 
proach to the Grand Cañon, by the wagon road to Hance's, July 7, 1892, 
numerous specimens of a woolly or fuzzy-looking leaf gall were found 
on a low growth of a Quercus much resembling alba, at a point several 
miles from the rim of the cafion. This oak has been identified by Mr. 
F. V. Coville as Q. gambelii. 
Gall.—Length, 5 to 9 mm.; greatest width, 3 to 5 mm.; height, 2 
to3 mm. Formed on upper side of leaf, but also showing below, 
irregularly oblong in outline, nearly always narrower at one end, 
always on one side of the midrib, extending usually from midrib to 
margin. Consisting simply of a portion of the leaf puckered up or 
elevated. above the surrounding portion, both surfaces (upper and 
under) being equally and thickly clothed with very fine woolly but 
nearly straight hairs, standing straight out from the surface from 
which they sprung. Pubescence whitish with a greenish, or witha 
slightly yellowish tinge at least in dried specimens; apparently but an 
increased abnormal development or hypertrophy and multiplication of 
the naturally very short pubescence of the oak leaf, very thick and of 
equal length on upper and lower sides. The pubescence is $ to $ mm, 
long. The puckered portion of the leaf which is elevated and bears 
this pubescence is not thickened, but of same thickness as rest of the 
leaf, thus making the thickness of a vertical section of the gall about 
1$ mm. 
Described from 9 or 10 galls. There is no sign of the gall-maker, 
and it is hard to see what the larve of the latter would feed on unless 
they are microscopic. It seems certain, however, that this is a gall 
formed by some insect. ; 
—C. H. TYLER Townsenp. 
A Hymenopterous Gall on the Creosote Bush. 
spherical twig gall, much resembling in its formation the fruit of the 
buttonwood or plane-tree, has been frequently found on the creosote 
