218 THE CANADIAN ENTOMOLOGIST. 



The subfamily otherwise, however, seems to be closely allied in the 

 structure of the thorax, and in wing characteristics, to both the 

 Lindeniime and the Thyreopimr ; but besides the long, petioliform first 

 abdominal segment, which separates the group from both, it is also 

 separated from the former by the bidentate, not simple, mandibles, while 

 from the latter it is also distinguished, as a rule, by antennal, mandibular, 

 palpial and other differences. 



The group may be divided into the following subgenera : 



Table of Genera. 

 Maxillary palpi 5-jointed ; labial palpi 3-jointed ; mandibles bidentate 



at apex, very exceptionally blunt at apex in 9 • 3- 



Maxillary palpi 6-jointed. 



Labial palpi 3-jointed; mandibles bidentate 2. 



Labial palpi 4-jointed. 



Mandibles at apex in 9 tridentate, in ^ bidentate ; mesopleura 

 bounded anteriorly and posteriorly by a sharp ridge or carina ; 

 head, thorax and abdomen opaque, very finely rugulose ; body 

 of abdomen oval or subovate, marked with yellow, the petiole 

 or first segment subclavate ; pygidial area in $ narrowed, 

 foveate : recurrent nervure in front wings received by the 

 cubital cell beyond the middle ; antennae in 9 12-, in c? 13- 



jointed Dasyproctus, Lep. et Br. 



^cMegapodium, Dahlb. 

 [Type D. bipunctatus, Lep.] 



Mandibles in both sexes bidentate ; ocelli triangularly arranged ; 

 mesopleura bounded by a sharp carina anteriorly, but not 

 posteriorly ; head and thorax finely, closely, minutely punctate ; 

 metanotal area distinct, smooth, polished, with some strife at 

 base, the posterior face with the cordate area well defined ; 

 abdomen clavate, impunctate, not marked with yellow, the 

 petiole stibclavate ; pygidial area triangular, flat, not foveate ; 

 recurrent nervure in front wings received by the cubital cell a 

 little before the middle; antenna; in 9 i2-jointed, the third 

 joint the longest, twice the length of the pedicel. (Male 



unknown) Synorhopalum, Ashm., n. g. 



[Type C. decorus, Fox.] 

 2. Face below rather broad, the eyes only slightly convergent towards 



