224 IOWA ACADExMY OF 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 (spumariu.'^) or 

 entire [Hneatus); legs short and stout, spurs and spines strong; whble 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. 



AA. 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. Uneatus Linn. 



^ PHIL.^NUS SPUMARIUS Linn. 



^ Cicada spnmaria L.inn. Faun. Suec, 240, 881, 1761. 



C Ptyelus albiceps Prov. Nat. Can. IV, 351, Hemip. du Can., 258. 



C Phihenus Uneatus Pvov. Hemip. du Can., 258. 



Broad and short, the elytra strongly convex, flaring 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 tha 

 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 

 coxte, as long as the front; pronotum roundingly angled in front, deeply 

 pitted back of the margin; elytra broad, costal margin strongly convex, 

 reflexed 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. 



