British Braconidse. 31 



the knapweed, Ccntaurea nigra, but obtained only females ; 

 in endeavouring to repeat his experiment I had better 

 success, procuring several specimens of both sexes. 



7. Trioxys angelica, Haliday. 



Aphidius (T.) angelicm, Hal., lib. cit., 489, $ . 

 T. angelicee, Marsh., lib. cit., p. 555, $ . 



$ Appendages of the ventral valve testaceous. Head and thorax 

 black ; abdomen nigro-fuscons, lighter or approaching to testaceous 

 on the 1st segment and in the middle of the 2nd. Oral parts and 

 palpi yellowish. Antennse 11-jointed, filiform, longer than the 

 head and thorax, the two basal joints yellow. Wings hyaline ; 

 squamulge black ; radicles dull testaceous ; stigma reddish yellow, 

 pale brown after death. Legs fulvo-ferruginous ; 4 posterior femora 

 above, middle of tibiae, and tips of tarsi, infuscated ; hind coxbb 

 blackish, testaceous at the extremity. Abdomen lanceolate, widest 

 in the middle ; 1st segment slender, bidenticulate on each side a 

 little beyond the middle, yellowish, more or less infuscated in the 

 middle. $ Unknown. Length almost h ; exp. 1 line. 



Haliday considered this species to be parasitic on some 

 aphis of the Angelica sylvcstris. Bred by Bignell from 

 Siphonophora olivata, Buckton, infesting in autumn the 

 thistle, Carduus lanceolatus. 



8. Trioxys mimttus, Haliday. 



Aphidius (T.) minutus, Hal., lib. cit., 491, $ . 

 T. minutus. Marsh., lib. cit., p. 556, $ 



$ Apical joint of the antennse closely united to the preceding. 

 Head and thorax black ; abdomen picenus, dull testaceous at the 

 apex. Similar to brevicornis (sp. 2) but with 11-jointed antennae, 

 the apical joint not elongate. Legs piceous ; knees fulvous ; tarsi 

 shorter. ^ Unknown. Length, | ; exp. H lines. 



Taken once only by Haliday upon a box-bush, Btixus 

 balearica, crowded with aphides. 



9. Trioxys pa Uidus, Haliday. 



Aphidius (T.) pallidus, Hal., lib. cit., 489, $ . 

 T. pallidus, Marsh., lib. cit., 556, $ 



$ Apical joint of antennae free and distinct. Abdomen pale 

 testaceous, with the intermediate segments, or even the posterior. 



