302 THE CANADIAN ENTOMOLOGIST. 



94 (93) Medio-lateral carinae of vertex meeting at apex. 



95 (96) Apical margin of vertex conically or roundly produced ; 



face distinctly longer than wide Delphacinusf 



96 (95) Apical margin of vertex not conically or roundly pro- 



duced, but truncate or slightly curved. 



97 (100) Vertex distinctly longer than wide, apex narrower than 



base. 



98 (99) First joint of hind tarsus distinctly longer than the 



other two together; antennae reaching beyond apex 

 of face Chloriona. 



99 (98) First joint of hind tarsus hardly as long as the other 



two together; antennae not reaching to apex of 



face Chlorionidea. 



100 (97) Vertex not, or slightly, longer than broad. 



101 (102) Face nearly as broad as long Eoeurysa* 



102 (101) Face' much longer than broad ] Kalpa 



103 (104) Face very long and slender ( Nilaparvata ** 



104 (103) Face longer than broad, but not greatly so. 



105 (106) Face with lateral edges nearly parallel (first segment of 



antennae nearly as long as second ; two basal areas of 

 vertex 5-sided; two median sectors, first touching 

 cubitus for short distance, characters not strictl}^ 

 reliable Liburnia. 



106 (105) Face with lateral edges more arcuate (first segment of 



antennae much shorter than second; two basal areas 

 of vertex 4-sided; one median sector which amalga- 

 mates with first cubitus to apex or near 

 apex) Conomelus 



fMegamelanus is separated from this genus chiefly by the straight lateral 

 pronotal carinae reaching the hind margin. 

 *This may prove to be Eumetopina. 

 *''In the Fauna of India Nilaparvata is separated from Kalpa by furcation 

 of median frontal carina at base, but in the description of the genus the medio- 

 lateral carinae of vertex are described as meeting before apex. 



(To be continued.) 



