NO. 2041. THE INSECT FAMILY DELPHACIDAE— CRAWFORD. 563 



c'. Basal antennal segment shorter than second; anterior femora normal; head 

 broader than prothorax; clypeus with a cone-shaped process in front; frons 



with two median carinse Bostaera Ball. 



b-. Both segments of antennae terete, I shorter than II. 

 c'. Frons, notum and abdomen with prominent pits. 



dK Frontal carinae forked near clypeus Achorotile Fieber. 



(P. Frontal carime forked at apex of head Laccocera Van Duzee. 



c2. Pita wanting, except obscurely present in some species of Phyllodlnas. 

 dK Frons with two median carinse over entire length, usually separating at or 

 near clypeal margin, roundly arcuate outward; carinse sometimes evan- 

 escent; head broad Jassidaeus Fieber. 



d^. Frons with one median carina, forked, if at all, at or somewhat below apex 

 of head. 

 eK Anterior and intermediate femora and tibia? greatly compressed and foli- 

 aceous; head broad; frontal carina forked a little below apex of head. 



Phyllodinus Van Duzee. 

 e^. Anterior and middle femora and tibiae normal. 

 fK Frontal carina percurrent to posterior margin of vertex without oblique 

 transverse carinae connecting it to lateral carina;. 



Libumiella, new genus. 

 p. Frontal carinae forked at or below apex of head and connected obliquely 

 with lateral carinae of vertex, 

 jr'. Carinae of head subobsolete, often scarcely discernible; vertex very 



broad, rounded in front; frons broad Kormus Fieber 



g\ Carinae of head always visible, usually rather strong and prominent, 

 sometimes evanescent on apex of head. 

 hK Vertex elongate, often twice as long as wide or more, produced at 

 least one-third before eyes, sometimes greatly so; calcar seldom 

 spoon-shaped, with margins usually rather close together and 

 dense pubescence between; female ovipositor sheath often con- 

 spicuously broadened Stenocranus Fieber. 



h\ Vertex less or not elongate, produced only a little before eyes; calcar 

 usually spoon-shaped, with margins more or less separated, with 

 or without pubescence between, 

 i'. Frons and vertex meeting at an acute angle at apex of head with 

 a semblance of a transverse carina on apex. . Megamdanus Ball. 

 iK Head dorso-ventrally rounded, not acutely angled as above; cari- 

 nae sometimes evanescent on apex of head, 

 ji. Median carina of frons forked distinctly below apex of head, 

 from one-fourth to one-half its length below; vertex usually 

 moderately broad. 

 k\ Frons almost circular, short; gena; not plane, ridged trans- 

 versely below ocelli; antennae exceedingly short, stout; 



calcar very short, thick Bakerella, new genus.' 



/:2. Frons elongate, more or less rectangular, longerthan broad; 

 genae plane; antennae longer; calcar normal. 



Dicranotropis Fieber. 



f. Median carina forked at or near apex of head (except in L. 



albolineosa often below); vertex usually rather narrow, 



sometimes broad; carinas variable from very conspicuous 



and sharp to evanescent Megamelus Fieber. 



