WALSH — DESCRIPTIONS OF N. AM. HYMENOPTERA. 89 



long as wide, and with its basal J whitish. Areolet peduncled, obliquely 

 oblong and tvvice as long as wide. Length c? .21 inch. Front wing c? 

 .20 inch. 



One % ; ? unknown to me. Sufficiently distinct from all de- 

 scribed N, A. Bassus by the areolet, and by the capillary white 

 lines on the metathorax, whence the specific name. 



CATOCENTRUS, new genus. 



Head transverse, scarcely wider than the thorax. Face with 

 a large, transversely oval tubercle on its disk, declivous above, 

 gradually sloped elsewhere, and projecting forwards beyond the 

 line of the eyes about f their shorter diameter. Cheeks not at all 

 inflated. Antennae with the ist joint of the scapus as large as 

 usual, truncate a little obliquely from above downwards, the 2d 

 joint not larger than usual ; the ist joint of the flagellum rather 

 long, the following joints all longer than wide except towards the 

 tip. Thorax much prolonged beyond the wings (as in Metopius) 

 so that the front wings are set on a little behind the middle ; par- 

 apsidal grooves usually obsolete. Scutel rounded, with a very 

 deep and wide transverse stria at its base. Abdomen sessile, 

 curved downwards, subclavate, with joints 2-6 constricted at base 

 (as in Metopius) .^ and only joints i-6 visible from above or be- 

 hind, 7 and 8 being telescopically retracted (as in Metopius), and 

 only seen from below. Joint i short and but slightly longer than 

 wide, and very slightly wider behind than before. Ovipositor and 

 its sheaths very short, generally exserted and directed perpendicu- 

 larly downwards. Venter as much excavated as in Pimpla, so 

 that the ventral and dorsal integuments are contiguous. Legs 

 short, rather robust ; hind tarsi much shorter than their tibiae ; 

 fi'ont and middle tarsi a trifle longer than their tibiae. Spurs nor- 

 mal. Tarsal claws unarmed, short and robust, shorter than the 

 pulvillus. Wings pretty long, with a moderately long radial area, 

 and usually with a small, rhomboido-tri angular areolet, the 2d 

 recurrent vein usually more or less triangulated ; the ist recurrent 

 vein not angulated, but curved near its base. Bullae 5, A indis- 

 tinct and sometimes subobsolete, placed on the anterior angle of 

 the areolet ; B normal ; C and D separated by the salient angle 

 of the 2d recurrent vein ; and E rather closer to the curve of its 

 vein than to the areolet. 



