174 SUB-GROUP OP ALBIPENNIS. 



transverse cubital nervure not clearly indicated ; second cubital cellule 

 with a small horny point, third a little narrower at base than at apex ; 

 second recurrent nervure received a little in front of cellule. Legs 

 luteous, femora thick, calcaria as long as the cerci. 

 Length 2f lines. 



From N. pavidus, aurantiacus may be distinguished 

 by its having the pleurse almost entirely luteous, by the 

 sides of the mesonotum being of the same colour, by 

 its more slender body, lighter-coloured antennae, and 

 generally much longer third cubital cellule. Hartig 

 says that aurantiacus has the stigma black at the 

 base, which is not the case with the specimen I have 

 described. 



Rare. Glanville's Wootton (Dale). 



SUB- GROUP OF ALBIPENNIS. 



Orange-yellow, the head and thorax more or less black. Abdo- 

 men with one or two black marks in middle of basal segment. 

 Antennae long and filiform, brownish, lined with black above. 

 Wings hyaline, obscured with yellow or fuscous ; stigma 

 yellow. Scutellum gibbous, punctured. Clypeus incised. 



A group easily recognised by the orange-yellow colour of the 

 body, yellow stigma, and punctured scutellum. The claws 

 have usually a subapical tooth. 



Synopsis of Species. 



1 (2) Antennse entirely black, claws with a subapical tooth, meso- 



thorax entirely black. Albipennis. 



2 (1) Antennse reddish beneath and at apex, pleurae yellow, claws 



bifid. 



3 (4) Tarsi not marked with black, and base of abdomen but rarely, 



breast with a double black mark in both sexes ; mesonotum 

 scarcely punctured. Bipartitus. 



4 (3) Tarsi annulated with black, mesonotum strongly punctured, 



breast rarely black in $ ; base of abdomen black. 



Xanthogaster. 



