i6 
OBSERVATIONS UPON. 
THE GRAPE-VINE LEAF-HOPPER. 
Typhlocyba vitifex (?) Fitch. 
This insect was mentioned in Bulletin of 
this station where it was given the name Typhlocyba 
vitis , which is the hopper that attacks the vine in 
the eastern states. A careful examination of the 
insect showed it not to be the eastern species, 
and specimens sent to Prof. Osborn of Ames, Iowa, 
and to Mr. Van Duzee of Buffalo, N. Y., have been 
determined for me as T\ vitifex. The form which 
occurs here, however, differs from the typical 
vitifex by having a large black spot on either side 
of the scutellum at the base, by having the red line 
on the middle of the thorax usually not forked in 
front and by not having the red on the head in two 
lines but in a large blotch more or less spotted with 
whitish. 
The illustration, Fig. 8, was made from a 
specimen that most nearly approaches a typical 
vitifex in coloration, It seems that the Colorado 
form is a very distinctly marked variety and for it 
I suggest the name Coloradoensis . The two spots 
on the scutellum, which are perfectly constant, will 
alone separate it from the eastern form. 
