8 
ginal vein of hind wings seems to extend forward into this fold; marginal vein of 
hind-wings with closely set row of minute hristles. First tarsal joint of all legs as 
long as two succeeding joints together. Middle tibial spur as long as corresponding 
first tarsal joint. 
Ablerus crsiocampae (Ashin.). 
Female. — Length, exclusive of ovipositor, 0.7 mm ; ovipositor, 0. 18 m,n ; expanse, 1.5 mtn ; 
greatest width of fore wing, 0.19 mm . Hairs of anal spiracle nearly as long as ovi- 
positor. Genera] color black, somewhat metallic, notal sclerites of thorax having a 
greenish luster, while abdomen appears bluish; antenna black, with funicle joints 2 
and 4 silvery white, and apical three-fourths of club light brown, with a somewhat 
silvery tinge. Head in life, and shortly after the insect has issued, whitish, with 
occiput yellow-brown and occipital line black ; brown patch including ocelli. Eyes 
bright red. In dry mounts the head shrivels considerably and becomes light brown 
in color. Legs dark brown; all tibiae with a silvery white distal apex. Spurs of 
middle tibiae black; tarsal joints 1, 2, and 5 dark brown or black; 3 and 4 whitish. 
Fore-wings with proximal three-fourths deeply and uniformly infuscated, except 
two light longitudinal streaks near base; apical one-fourth hyaline ; discal cilia very 
minute, but closely placed; sparse, however, towards distal anal portion and towards 
base of wing. 
Eedescribed from ten freshly-issued females reared July G and 7, 1894, 
from female specimens of Chionaspis furfurus. District of Columbia. 
THE BUFFALO TREE-HOPPER 
{Ceresa bubalus Fab). 
By C. L. Marlatt. 
The adult of this little grass-green insect is one of the best known 
of the common species frequenting vegetation, and often attracts the 
curious on account of its triangular shape, quick, active flight, and con- 
siderable vaulting powers. It receives its peculiar popular name from 
a supposed similarity in shape to the male buffalo or bison. The thorax, 
or pronotum, is greatly enlarged anteriorly, projecting laterally in two 
strong horns, and is distinctly triangular, as shown in the illustration 
(Fig. 4a). It is this peculiar shape rather than any knowledge of its 
habits that has given it its popular interest. During the last eight or 
ten years, however, it has become important on other and strictly 
economic grounds. In the Mississippi Valley, especially from the Mis- 
souri northwards, well up into Canada, it has been the cause of very 
great damage in orchards, particularly to young trees and nursery 
stock, not, however, confining itself to fruit trees, but attacking also 
all sorts of shade trees. The injury is due solely to the cutting up of 
the limbs by the female with her saw-like ovipositor (Fig. 4./, g)in the 
deposition of her eggs, in which particular the injury is not unlike that 
caused by the periodical cicada, and frequently is scarcely less in 
amount on account of the great numbers in which the Ceresa occurs. 
On entering a badly infested orchard in the latter part of August, or in 
September, the buffalo tree-hopper will indicate its presence by flying 
