230 THE CANADIAN ENTOMOLOGIST. 



The subfamily is apparently confined to the Neotropical and Austra- 

 lian regions, no species being known in our fauna north of Mexico. 

 The genera recognized may be tabulated as follows : 



Table of Genera. 



Front wings with three submarginal cells 2. 



Front wings with four submarginal cells, the hind wings with one closed 

 submarginal cell (except in Syzygonia, Klug, which has two). 



Second and third submarginal cells each receiving a recurrent 



nervure 4. 



Second submarginal cell receiving both recurrent nervures 3. 



2. First and second submarginal cells each receiving a recurrent 



nervure ; hind wings with one closed submarginal cell ; antennse 



6-jointed Thulea, Say. 



Second submarginal cell receiving both recurrent nervures ; hind 



wings with one closed submarginal cell ; scutellum rounded behind. 



Antennae 1 7-20-jointed, the flagellar joints dentate or with short 



branches beneath Lophyrotoma, Ashm., n. g. 



(Type P. interruptus, Klug.) 

 Antennc-e 23-jointed, each flagellar joint with a very long branch. 



^ Pterygophorinus, Ashm., n. g. 



(Type P. analis.) 



3. Scutellum with the hind angles dentate ; antennae 25-jointed, flabellate. 



(t Pterygophorus, Klug. 



(Type P. cinctus, Klug.) 

 Scutellum posteriorly rounded, not dentate; antennae 17-20 jointed, 



biramose in (^ Brachytoma, Westw. 



(Type B. fumipennis, Westw.) 



4. Middle and hind tibije with lateral spurs 5. 



Middle and hind tibiae without lateral spurs. 



Antennae 5-jointed, 9 ; hind wings with one closed submarginal 



and one closed discoidal cell Syzygonia, Klug. 



(Type S. cyanocephala, Klug.) 



Antennae 6-jointed, $ ; hind wings with one closed submarginal 



cell, but without a closed discoidal cell.. Syzygonidea, Ashm., n.g. 



(Type S. cyanea, Brulle.) 



5. Scutellum rounded behind, unarmed. 



Antennaj 7-jointed Corynophilus, Kirby. 



( = Cephalocera, Klug.) 



