190 HEMIPTERA-HOMOPTERA. 
Subfam. PTV ELINA. 
In this subfamily the anterior margin of the pronotum is more or less rounded and 
produced between the eyes, which are nearly always distinctly transverse. ‘There are, 
however, as before stated, one or two transitional forms in which the eyes are round; 
but in these the anterior margin of the pronotum is decidedly though not strongly 
rounded, and a line drawn through its front part will pass at least through the middle 
of the eyes, whereas in the Cercopine the anterior margin of the pronotum is cut off 
in a straight line immediately behind ‘the eyes. 
The subfamily Ptyeline corresponds to Stal’s Aphrophorida (Hemipt. Afr. iv. p. 66) ; 
in his table he makes considerable use of the characters drawn from the venation of the 
wings, aud in some cases they appear valuable, but it is a question whether they are 
always quite constant. 
The Ptyeline are not, apparently, very strongly represented in Central America, 
except so far as the insignificant and variable genus Clastoptera is concerned. 
The following table will help to distinguish the Central-American genera :— 
I. Eyes round or nearly round, the head slightly produced between 
them... soe ee ew ew ew ww ww.) ~Neenus, gen. nov. 
II. Eyes distinctly transverse. 
i, Clavus acuminate at the apex; submarginal vein of the wings 
without a small area interrupting its upper border. 
1. Vertex of the head considerably produced in front of the eyes. 
A. Submarginal vein of the wings with a break at the apex . Lepyronia, Am. et Serv. 
B. Submarginal vein of the wings not interrupted at the apex. 
a. Vertex about twice as long as the largest diameter of 
the eyes. 
a*. Posterior tibie shorter and stouter, with two strong 
and large teeth. 
at. Size larger—length 10-18 millim.; head distinctly 
narrower than the pronotum at the shoulders . . Cephisus, Stal. 
b+. Size smaller—length 5-7 millim.; head at the base 
as broad as the pronotum at the shoulders. 
at. Pronotum distinctly carinate. . . . . . . Aphrophora, Germ. 
b{. Pronotum not carinate. . . . - - « . Philenus, Stal. 
6*. Posterior tibiz elongate and slender, with two feeble 
teeth: length 8-1] millim. 
aj. Pronotum carinate . . . . . . . « « « Paraphrophora, gen. nov. 
6{. Pronotum not carinate, with a smooth central 
line. 2... . . - + + « « « .« Xenaphrophora, gen. nov. 
6. Vertex two and a half or three times as long as the 
largest diameter of the eyes. 
a*, Head as broad as the pronotum . . . . . . . Microsargane, gen. nov. 
é*, Head distinctly narrower than the pronotum . . . Epocranion, gen. nov. 
