20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Scutelluin gibbous with lateral carinpe; metathorax bidentate, exareolate. 



(62) JoppUi'H Berthoumieu^ Celmis Tosquinet ^ Fseiidojoppa Kreichbaumer. 



2. Metathorax normal, unarmed 3 



Metathorax bispined or ])identate. 



Spiracles of abdominal segments elongate or oval; metathorax not or very 

 indistinctly areolated; sulnnedian cell not. longer than the median; 

 disco-cubital nervure broken by a stump of a vein; areolet with the 

 sides strongly convergent above, triangular or rhomboidal; abdomen 

 banded, the ovipositor subexserted. 



(63) Cressonianus Ashmead, new genus. 

 (Type, Patroclus kdus Cresson.) 



3. Metathorax not short, not or very indistinctly areolated; submedian cell a little 



longer than the median; disco-cul)ital nervure broken l)y a stump of a 

 vein; areolet pentagonal; scutellum margined at sides anteriorly; abdo- 

 men blue or black, not l)anded, the spiracles of the first segment large, 



subreniform; claws with long teeth (64) Patroclus Cresson. 



(Type, Pdtrodus iiigrocaruleux Cresson. ) 

 Metathorax short, truncate i^osteriorly and distinctly areolated; submedian 

 cell a little shorter than the median, or never longer; disco-cubital 

 nervure not broken by a stump of a vein ; areolet regularly pentagonal ; 

 scutellum margined at sides clear to the apex; abdomen not wholly 

 blue or black, the spiracles of the first segment very small, rounded; 

 claws with shorter teeth at liase only (sometimes difficult to discern). 



(65) Nrotypus Forster. 

 (Type, Ichneumon le)>klator Fabricius. ) 



4. IMetathoracic spiracles oval, the metanotum exareolated; scutellum flat, longer 



than wide, with elevated lateral margins (66) Eradha Cameron. 



(Type, Eradha trichiosoma Cameron. ) 

 Metathoracic sjjiracles round, the metanotum areolated; scutellum pyramidal. 



(67) Listrodromus Wesmael. 

 (Type, Ichneumon nyctermerus Gravenhorst. ) 



Tribe IV. HERESIARCHINI. 



1900. Ileresiarchini, Tribe IV, Ashmead, Smith's Insects of New Jersey, p. 567. 



This tribe is proposed for 'certain o-enera having the mandibles 

 simple, edentate and acute at apex, and this simple character readily 

 distinguishes the group from all others. 



Four genera belong here, separable as follows: 



T.\BLE OF GENERA. 



Metathorax n< )rmal, unarmed 2 



Metathorax bidentate. 



Head large, strongly concave behind the temples, the cheeks full, buccate; 

 transverse median nervure in front wings interstitial; disco-cubital 

 nervure broken by a stump of a vein before the middle; antennse 



broadly ringed with white (68) Plagiotrypcs Ashmead, new genus. 



(Type, Ichneumon concinnus Say.) 

 2. Metathorax with the areola semicircular, smooth, and shining; scutellum not 

 margined laterally to lieyond the middle; sec<ind abdominal segment 

 with the gastrocoeli linear and placed longitudinally. 



(69) Heresiarches Wesmael. 

 (Type, Heresiarches eudoxius Wesmael.) 



