THE CANADIAN ENTOMOLOGIST 299 



53 (54) Medio-longitudinal carina of vertex with small areolet 



in middle; no transverse or medio-lateral 



carin^e Liburniella. 



54 (53) Medio-longitudinal carinae without small areolet, trans- 



verse or medio-lateral carinse present. 



55 (74) Medio-lateral carincie of vertex converging apically, but 



not meeting on vertex, continued separate on to face, 

 where they meet (frontal carina furcate). 



56 (63) Lateral carinas of pronotum straight or convergingly 



curved posteriorly, reaching hind margin, or all but 

 doing so. 



57 (58) First joint of antenna? more than half the length of 



second Megamelus, 



58 (57) First joint of antennae less than half the length of second. 



59 (60) Head and thorax (to end of mesonotum) twice or more 



. the width of head, including eyes; length of face 

 three times the breadth ; spur with many (about 12-15) 

 small teeth Stenocranus. 



60 (59) Less slender forms. Head and thorax about one and a 



half timxs the width of head, including eyes; length 

 of face 2 or 23^ times the breadth. 



61 (62) Vertex perceptibly longer than broad, apex narrower 



than base; spur with few (about 8) large teeth Kelsia. 



62 (61) Vertex square; spur with numerous minute 



teeth Peregrinus. 



63 (56) Lateral keels of pronotum divergingly curved posteriorly, 



not reaching hind margin. 



64 (65) Medio-lateral carincX of vertex not meeting lateral 



carina? till base, forming two 4-sided areas; face 

 considerably broadened in middle, furcation of median 

 frontal carina very near base Conomelus. 



65 (64) Medio-lateral carina? of vertex meeting lateral carinse 



before base, forming two 5-sided areas; face not so 

 broad in middle. 



