STATE AGRICULTURAL SOCIETY. 411 



GRAPE. LEAVES. 



line, and in rare instances a second dot is present upon the mner side of each 

 of these joints. The tip of the ovipositor of the females is also black. These 

 are all the characters which are presented by the color in this insect. Nume- 

 rous others, however, are derived from the form and sculpture of its several 

 parts, of which we notice the following. 



The HEAD is twice as long as wide and is inclined downwards obliquely and 

 in the preserved specimens often perpendicularly. It is shaped like an egg, 

 moderately flattened upon its upper side. In dried specimens it is crossed 

 between the eyes by a wide shallow groove. The feelers or palpi are long and 

 thread-like, composed of cylindrical joints, of which the penultimate one is 

 almost as long as the last one, which is slighty thicker, long oval, and on its 

 inner side obliquely cut off in a straight slope extending two-thirds of the 

 length of this joint, the face of which slope is hollowed like the inside of the 

 bowl of a spoon. They are clothed with fine erect bristles, in addition to 

 which the last joint is densely coated with much finer prostrate hairs. The 

 antenncB are double the length of the body, tapering and very slender, composed 

 of a hundred joints or more, the articulations of which are faint and towards 

 the apex are scarcely perceptible. The basal joint is thrice as thick as the fol- 

 lowing one, cylindric and but little longer than wide. The succeeding joints 

 are very short, and towards the tip gradually increase in length and diminish 

 in diameter, here sometimes showing tawny brown rings upon the alternate 

 joints. 



The THORAX is as wide as long and of the shape of a half cylinder, being 

 rounded from above downwards, with its opposite sides parallel and its angles 

 rounded. On each side low down it forms a thin foliaceous edge which hangs 

 downward and curves a little outward. Both the anterior and posterior edges 

 curve slightly upward and the latter is fringed with short pale yellowish hairs. 

 Upon its surface posteriorly a shallow furrow may be seen along the middle 

 and on each side of it a curved impressed line. 



The ABDOMEN is long, cylindrical, soft and often much distorted in the dried 

 specimen and discolored from inclosed alimentary matter. It ends in a pair of 

 long slender tapering appendages which are about equal to the abdomen in their 

 length and are clothed with fine erect whitish hairs. In addition to these in 

 the female is the ovipositor, which is of the same length, with the appendages, 

 reaching to the tip of the wing covers, and is of a hard horn-like substance, 

 cylindrical and straight or very gently curved upwards. 



The WING COVERS of the rna/e have already lx;en partly described. When 

 folded together they appear perfectly flat and of the shape of an egg with its 

 small end forward. They are rather more than half an inch long, and tho 

 breadth of their upper horizontal portion is more than half their length. Their 

 deflected outer portion or costal area is divided by oblique veinlcts into about 

 ten cells of a rhombic form. Above these is an elongated elliptic area reaching 

 three-fourths of tho length of the wing cover,, bounded on each side by two 

 coarse longitudinal veins which are the proper ribs of the wing. This elliptic 

 area is subdivided into several small scpiarc cells by veinlets crossing it trans- 

 versely. The horizontal portion of the wing covers have two veins running 

 parallel with the hind edge and the hind part of the inner edge. The remain- 



