62 Rev. T. A. Marshall's Monograph of 



distinct. Parasite of Aphis scabiosm, Kalt., which infests 

 Scahiosa arvensis. Bignell reared 29 specimens, and 

 observed others, Avhich he thought were of the same 

 species, on the blossoms of Ballota nigra, stinking hore- 

 hound. 



34, Aphidius leucopterus, Haliday. 



A. leucopterus, Hal., lib. cit., 103; Marsh., /i&. cit., p. 

 597, $ ?. 



9 Deep black, shining ; 1st abdominal segment dark brown. 

 Antenna) black, slender, 15-jointed. Wings whitish ; stigma yellow. 

 Fore legs yellowish ; 4 posterior blackish brown, with the trochanters, 

 the base of the tibia; and of the tarsi pale. A pale patch in the 

 middle of the disc of the abdomen. Terebral valves angulated at 

 the base above, acute at the extremity. ^ Antenna; 16-jointed ; 

 wings white ; all the legs blackish brown, annulated with pale colour ; 

 abdomen black, the pale patch in the middle less distinct. Length 

 nearly | ; exp. \\ lines. Haliday. 



Forster in his Synopsis (p. 249) has made of this species 

 a genus Dixretus, for which he indicates two characters 

 not mentioned by Haliday, viz., metathorax not areated, 

 and pobrachial nervure perceptible. The former pecu- 

 liarity is shared by several other known species of 

 Aphidms ; the latter is rather a distinction of individuals, 

 and certainly not of generic value. The present insect is 

 unknown to me, and found rarely, according to Haliday, on 

 coniferous trees. 



35. Aphidius Irassicte, Marshall. 



A. brassier, Marsh., lib. cit., p. 597, ^ ?. 



$ Black ; abdomen brown, with the 1st segment more or less pale 

 •towards the base, and the two first sutures pale. Oral parts and 

 palpi pale. Antennse short, reaching backwards as far as the end of 

 the 1st segment, black, with the extremity of the 2nd joint testaceous, 

 14-jointed. Mesothoracic furrows obsolete ; metathorax carinated, 

 areated. Wings hyaline ; squamulte, radicles, and basal nervures 

 dull testaceous]; stigma pale yellowish ; culjital areolets and 1st 

 discoidal effaced ; no visible nervures beyond the stigma. Fore legs 

 testaceous, their femora sometimes streaked with fuscous ; 4 posterior 

 fuscous, with the extremity of the coxae, the 2nd joint of the 

 ;trochanters,'the extremity and the underside of the femora, and the 



