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IOWA ACADEMY OP SCIENCES. 
venation simple, both veins of the corium forking- and forming two elongate 
discoid cells, apical cells somewhat irregular, usually about five; wings 
with the third vein from the marginal vein either forked [spumarius) or 
entire {lineatus)\ legs short and stout, spurs and spines strong; whole dorsal 
surface of insect thickly, finely punctured and clothed with a short pros- 
trate pubescence. 
The members of this genus are all rather small compact 
forms from 4.5 to 6mm. in length and about half that in width, 
they are apparently confined to the North Temperate zone; seven 
species have been recognized in Europe, two of which range 
clear across that continent and along the eastern section of 
this one, being the only representative of the genus in this 
country. They are quite different in form and appearance, and 
are readily separated by reference to a few structural char- 
acters, although the variation in color of one species is almost 
without limit and includes in its variations one that simulates 
the constant color markings of the other species. 
SYNOPSIS OF THE SPECIES. 
A. Vertex twice wider than long, tylus broad, occupying more than 
half the length of the vertex, elytra with the costal margin con- 
vex, much broader than across eyes; third vein of wing forked, 
forming a closed apical cell. spumarius Linn. 
A A. Length of vertex equaling two thirds of its width, tylus narrow, 
occupying half the length of the vertex; elytra with the costal 
margin nearly parallel, scarcely wider than across eyes; third 
vein of wing not forked. lineatus Linn. 
PHIL^NUS SPUMARIUS Liim. 
Cicada spumaria Linn. Faun. Suec., 240, 881, 1761. 
Ptyelus albiceps Prov. Nat. Can. IV, 351, Hemip. du Can., 258. 
Philcenus lineatus Prov. Hemip. du Can. , 258. 
Broad and short, the elytra strongly convex, fiaring on the 
margin; head broad and short, sloping; color very variable; 
length 5. 5-6. 5mm. , width 2-2. 5mm. 
Vertex short, sloping, twice wider than long, a little over one-half the 
length of the pronotum, anterior margin obtusely angulate, tylus broader 
than long, longer than the vertex behind it, ocelli placed close to tho 
posterior margin, equidistant from each other and eyes; front broad, with 
seven or eight coarse ribs, outline only slightly curved, forming an acute 
angle with the vertex, the apex blunt; rostrum reaching on to the middle 
coxm, as long as the front; pronotum roundingly angled in front, deeply 
pitted back of- the margin; elytra broad, costal margin strongly convex, 
refiexed before the middle; venation simple, the outer vein forking just 
beyond the middle and forming an elongate discoid cell, fully five times as 
long as wide, angular at the fork; wings, with the third vein from the 
marginal one, forking before the apex. 
