THE CANADIAN ENTOMOLOGIST, 30l 



81 (80) Head in profile more or less angular at apex of vertex, 



face flattened. 



82 (83) Vertex twice as long as wide Zuleika. 



83 (82) Vertex considerably less than twice the width. 



84 (87) First joint of antennae more than half the length of 



second. 



85 (86) Broad forms. In dorsal view width of head (including 



eyes) nearly twice the length; pronotal carinae in 

 some species not quite reaching hind margin, but not 

 divergingly curved :■ Pissonotus. 



86 (85) More slender forms. In dorsal view \ Megamelus 



width of head (including eyes) less Gelasto- 

 than 11^ times the length; pronotal | delphax 



lateral carinae . reaching hind, margin, j 



87 (84) First joint of antenna less than half the length of second. 



88 (89) Head and thorax (to end of mesonotum) twice or more 



the width of head, including eyes .Stenocraniis . 



89 (88) Less slender forms. Head and thorax about l^ times 



the width of head, including eyes. 



90 (91) Lateral margins of face straight, face broadest at apex, 



base truncate Sogata . 



91 (90) Sides of face slightly arcuate, apex narrower than 



middle, base curved or subconical. 

 a Junction of Vertex and face angular in profile, a faint 



carina dividing them Haplodelphax. 



b Junction of vertex and face more rpunded in 



profile Kelisia* 



92 (75) Lateral carina? of pronotum divergingly curved posterior- 



ly, not reaching hind margin. 



93 (94) Medio-lateral carinae of vertex meeting together before 



apex, vertex well produced beyond eyes (Y-shaped 

 carina faint) Sardia. 



'^Conomelus and Etirysa can be distinguiihed from this genus by the broader 

 vertices if the furcation of the frontal carinee are obscure. Megamelanus ap- 

 pears to be near this genus. 



