74 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Mesonotum not lobed; metathorax with the areola longer than thepetiolar 

 area; transverse median nervure in hind wings broken /err above 



the middle ( 546) Xencmastes Forster. 



49. Metanotum completely areolated (547) Si/clmoporttifi Forster. 



Metanotum not completely areolated. 



Occipital margin not interrupted medially 50 



Occipital margin interrupted medially (548) Asthenara Forster. 



r>0. Base of discoidal cell as wide or wider than the apex of the second discoidal 



cell 51 



Base of discoidal cell not as wide as the apex of the second discoidal cell. 



(549) Camporychus Forster. 



51 . Areolet entirely wanting 52 



Areolet distinct in position but open behind. 



Transverse median nervure in front wings originating from before the basal 

 nervure; base of discoidal cell only twice as wide as the apex of the 

 hind middle humeral cell; areolet very small; spiracles of the first 

 abdominal segment placed somewhat behind the middle. 



(550) Trapezocora Forster. 



Transverse median nervure in front wings originating far behind the basal 

 nervure; base of discoidal cell at least three times as wide as the 

 apex of hind middle humeral cell; areolet very large, briefly petio- 

 late, widely open behind; spiracles of the first abdominal segment 

 placed before the middle (551) Ithhjelus Forster. 



52. Clypeus with the anterior margin not semicircularly emarginate 53 



Clypeus with the anterior margin semicircularly emarginate or impressed. 



Metathorax very short, abruptly truncate behind, and bounded above by a 

 transverse carina; flagellum shaggy from short stiff hairs, the first 

 joint longer than the second (552) Cacotropa Forster. 



53. Metanotum more or less areolated 55 



Metanotum not areolated 54 



54. Spiracles of the first abdominal segment very prominent; second segment \viih 



distinct lunula;; metasternum not margined; last joint of hind tarsi 

 scarcely longer than the fourth, but distinctly shorter than the 



third (553) PMlotymma Forster. 



Spiracles of the first segment not at all prominent, the second segment idthout 

 lunuUe; metasternum margined in part; last joint of hind tarsi 

 decidedly longer than the fourth and as long as the third. 



( 554 ) Scopesis Fdrster. 



55. First abdominal segment irilh lateral carin;c extending from the spiracles to 



apex of segment 56 



First abdominal segment vitliout lateral carina.' from the spiracles to apex of 



segment. 



Second joint of hmd trochanters normal (555) Syndipnus Forster. 



Second joint of hind trochanters beneath flat and produced outwardly 



beyond the insertion of the femur (556) Volucris Davis. 



56. Petiolar area of metathorax without a middle carina 57 



Petiolar area of metathorax with a middle carina. 



Teeth of mandibles of an equal length (557) Listrota Forster. 



Teetli of mandibles unequal, the lower tooth the longer. 



(558) Tlemon FOrster. 



57. Spiracular area sharply separated from the middle pleural area l)y a transverse 



carina 58 



Spiracular area not separate from the middle i)leural area by a transverse carina. 



(559) Polyterus Forster. 



II 



