STATE AGRICULTURAL SOCIETY. 391 



GRAPE. LEAVES. 



the upper margin of the head and the breast being also black and 

 the wings hyaline. Length of the male 0.15, of the female 0.20. 

 Numbers of this insect may sometimes be met with on grape 

 vines, about the last of July, and a few stragglers remain into 

 October. The anticonigra of M. Faiiunaire, (Ann. Soc. Ent., 2d 

 series, iv. p. 498,) differs from this species only in having the fore 

 ■wings with coarse black or brown veins. All of the many speci- 

 mens which I have met with in the state of New- York, have the 

 wing veins colorless. This insect and the calva of Say, which is 

 slightly smaller and shining black, with the face, shanks and feet 

 dark yellowish, the tip of the thorax and abdomen pale greenish, 

 and the wings hyaline, are the only New- York species of Acutalis 

 which I have discovered, although several others occur in Penn- 

 sylvania and farther south, and some of them are quite numerous 

 upon the kinds of vegetation which they infest. 



104. Vine leaf hopper, Erythroneura Vitis, Harris. (Homoptera. Tet- 

 tigoniidse.) 



Pale yellow with two broad blood-red bands and a third dusky 

 one on the apex, the anterior band occupying the base of the 

 thorax and of the wing covers and scutel, the middle one ending 

 in a much narrower nearly square black spot situated on the 

 middle of the outer side of the wing covers. Length 0.13. 

 Though so small such swarms of these insects sometimes gather 

 on the vines in August and bleed the leaves so freely that they 

 become dry and stiff and of a yellow color, as when fading in 

 autumn. See Harris's Treatise, p. 198. 



There are numerous kinds of little leaf hoppers similar to those of the ?ine. 

 Hitherto they have all been included in the genus Typhlocyba by authors. In 

 consequence of their diminutive size they have been less investigated than tho 

 other insects of the order to which they pertain. The number and arrange- 

 ment of the veins in their wing covers and wings, present such ditfercnccs as 

 ■would probably have induced authors to separate them into distinct genera, 

 before this day, had they been of larger size and better known. The species, 

 moreover, are so numerous, and will be so largely increased no doubt by future 

 di.scoveries, that as a matter of convenience a separation among them appears 

 to be required. The characters assigned to the j^vmiii, Typhlocyba, by different 

 authors, are very confused and contradictory, as they have l)cen drawn from 

 one or another of the species, some defining it as with, others, without ocelli, 

 etc. I was, hence, wholly at a loss with respect to the insects which it was 



