72 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Lower tooth of mandibles longer than the iipper tooth. 



Metathorax tvUhoiit an areola or a petiolar area; clypeuH vifh a narrow, 

 transverse furrow close to the front margin . . (515) Isodiacla Forster. 

 Metathorax ivith a petiolar area which is separated by a median carina; 

 clypeus without a transverse furrow anteriorly. 



(516) Neales Forster. 



28. Clypeus posteriorly at base very strongly impressed, deeply dish -shaped 29 



Clypeus behind the middle abrupt, anteriorly transversely impressed, the ante- 

 rior margin strongly and ])roadly truncate, incised at the middle; 

 first abdominal segment at base narrower than lietween the spir- 

 acles; carinse extend from the spiracles to the apex of the segment; 

 petiolar area with a sharp median carina. (517) Zacalles Forster. 



29. First abdominal segment at extreme base not wider than between the spiracles; 



from each spiracle extends a fine carina to the apex of the segment; 



antennae ringed with white (518) Perispuda Forster. 



First abdominal segment at extreme base wider than between the spiracles; no 

 carinse from the spiracles (519) Zajjlethis Forster. 



30. Mandibles distinctly bidentate at apex 31 



Mandibles gradually acute, iriihout teeth (520) Alcochera Forster. 



31. Areolet distinctly petiolate 33 



Areolet not distinctly petiolate 32 



32. Areolet sessile; mesonotmn with deep parapsidal furrows anteriorily. 



(521) Apimelcs Forster. 

 Areolet subsessile, not distinctly sessile. 



Mesonotum uith abbreviated parapsidal furrows anteriorly; clypeus not 

 wider than long; head transverse; transverse median nervure in 

 hind wings broken almost at the middle; lunulee on segments 2 and 3 



very distinct (522) Laepsenis Forster. 



Mesonotum wUliout parapsidal furrows anteriorly; clypeus wider than long; 

 head not transverse ; transverse median nervure in hind wings Ijroken 

 far below the middle (523) Epachthes Forster. 



33. Third abdominal segment longer than wide (52-1) Lagarotis Forster. 



Third abdominal segment not longer than wide. 



Mesopleura u-ithout a promment tooth posteriorly 34 



Mesopleura with a prominent tooth posteriorly (525) Daspletis Forster. 



34. Metanotum more or less areolated 38 



Metanotum not areolated 35 



35. Lower tooth of mandibles not longer than the ujiper tooth 36 



Lower tooth of mandibles much longer than the upper tooth. 



(526) Azelus Forster. 



36. Transverse median nervure in hind wings broken at or a little above the middle, 



rarely a little below the middle 37 



Transverse median nervure in hind wings broken distinctly helow the middle. 



(527) Adranes Forster. 



37. Fourth abdominal segment fully as long as the third.. (528) Zaphthora Forster. 

 Fourth abdominal segment shorter than the third. 



Clypeus flat very slightly romided anteriorly or nearly squarely truncate, 

 without an impressed margin; lateral margins of second and third 

 abdominal segments not curving upward.. (529) Aderioma Forster. 



Clypeus medially emarginate, with a transverse impression, the same later- 

 ally before the emargination also incised; lateral margins of second 

 and third abdominal segments acutely bent upward, the spiracles 

 not lying close to the lateral margins (530) Lamachns Forster. 



38. Metanotum not completely areolated 41 



Metanotum completely areolated 39 



