IOWA ACADEMY OP SCIENCES. 
219 
It has not been thought best at present to change the generic 
reference given by VanDuzee, although not included in the 
synopsis. With a more exact definition of the American genera 
which will be possible as our species are better known, this and 
some other aberrant forms of a generalized and plastic charac 
ter may find their proper position. 
It was first described by Forbes as a Gicadula from specimens 
with weak venation. VanDuzee received dark specimens of 
the green form from Mississippi Uiiid described them as Tham- 
notettix perpunctata; also describing a strong veined form from 
California with two cross nervures as, D. fuscinervosus. Gillette 
and Baker, from very dark forms, described D. vanduzei. 
Larvae and adults were found in immense numbers about the 
first of July. The larvae had mostly all issued by the 10th, the 
adults continuing through the month; adults were again taken 
late in September and on into October. They were first found 
on a patch of plowed ground overgrown with Panicum sangui- 
nale and crus-galU^ and Setaria viridis. Here they occurred in 
immense numbers. They appeared to be more common on the 
annuals than on the perennials, but were taken almost every- 
where, the later ones mainly from blue grass, the annuals hav- 
ing ripened and died. Professor Forbes described it as a seri- 
ous pest of oats and in Insect Life, vol. VI,. it was recorded as 
very abundant and destructive in lawn grass in Washington, D. C. 
Where first found this season it occurred in two distinct forms 
about equally common, one with a single cross nervure and long 
elytra as in Thamnotettix. This form was light greenish- yel- 
low with a light face, usually surrounded by an arch of dots 
above on the anterior margin of the vertex and two oblique 
dots on the disk of the vertex. The other form was cinereus, 
darker below, with shorter hyaline elytra, usually with two 
cross nervures and the central anteapical cell divided. These 
may probably be regarded as the equivalents of long and short- 
winged forms in other species, the smaller darker form with 
the more complex venation, being found almost everywhere, 
while the lighter form with the weak venation was only found 
in connection with the larvae and apparently made little use of 
the wings. 
The specific characters differ very little between the differ- 
ent forms, the variations in genitalia being similar to those in 
the long and short- winged forms of other species. 
The vertex is short, obtusely angled, margins rounding to the front; a 
row of dark spots on the anterior margin extending down the face to the 
