giual vein of liiiul winj^s seems to extend forward into this fold; marginal vein of 

 hind-wings with closely set row of minute bristles. First tarsal joint of all legs as 

 long as two sncceeding joints together. Middle tibial spur as hmg as corresponding 

 first tarsal joint. 

 Ablerus crsiocampae (Ashm.). 



Female. — Length, exclusive of ovipositor, 0.7"""; ovipositor, 0.18"""; expanse, 1.5"""; 

 greatest width ol' fore wing, 0.19""". Hairs of anal spiracle nearly as long as ovi- 

 positor. (;leueral color black, somewhat metallic, notal sclerites of thorax having a 

 greenish luster, while abdomen appears bluish; auteun;e black, with fuuicle 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 tibite with a silvery white distal apex. Spurs of 

 middle tibise black; tarsal joints 1, 2, and 5 dark brown or black; 3 and 4 whitish. 

 Fore-wings with proximal three-fourths deeply and. uniformly iufuscated, except 

 two light longitudinal streaks near base ; apical one-fonrth hyaline ; discal cilia very 

 minute, but closely placed; sparse, however, towards distal anal portion and towards 

 base of wing. 



Kedescribed from ten freslily-issued females reared July and 7, 1894, 

 from female specimens of Cliionaspis fur/urus, District of Columbia. 



THE BUFFALO TREE-HOPPER 



(Ceresa buJ)aUis Fab). 

 By C. L. Marlatt. 



The adult of this little grass-green insect is one of the best known 

 of the common species freiineuting 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 simihirity 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. -ia). 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 u]> into Canada, it has been the cause of very 

 great damage in orchards, j)articularly 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 tlie cutting up of 

 the limbs by the female with her saw-like ovipositor (Fig. 4./, g)m the 

 deposition of her eggs, in which particular the injury is not unlike that 

 caused by the ])eriodical cicada, and freiiuently is scarcely less in 

 amount on account of the great luimbers 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 it^ presence by flying 



