60 Rev, T. A. Marshall's Monograjyh of 



antenna) almost as long as the body, entirely black, 14-jointed. 

 Length, § ; exp. H lines. 



A common parasite, reared in numbers by Bignell from 

 A'phidius cardui, L., on Cardmts lanceolatus ; from Siphono- 

 phora olivata, Buckton, also infesting thistles ; from Aphis 

 jacobxa, Schr., on Senecio jacobiea, common rag-wort ; and 

 from Siphocoryne coprem, Fab., a puceron inhabiting 

 different kinds of willow. 



31. Aphidius salicis, Haliday. 



A. salicis, Hal., lib. cit., 102 ; Marsh., lib. cit., p. 594, $ $• 



$ Black, with a pale patch on the abdomen ; Ist segment some- 

 times brown. Oral parts dull yellow. Antennae a little longer than 

 the head and thorax, slightly incrassated towards the apex, 13-jointed. 

 Wings hyaline ; stigma yellowish, becoming brownish after death ; 

 uervures paler brown ; lower side of the 1st cubital areolet complete. 

 Four anterior legs dull ferruginous : 2nd jjair with the base of their 

 femora, the middle of the tibice, and the tarsi, inluscated ; hind pair 

 brown, with the trochanters and both ends of the tibiae ferruginous ; 

 all the coxBe black. Second abdominal segment pale in the middle ; 

 the two first sutures also pale ; or the abdomen shows in the middle 

 an indeterminate pale patch. ^ Antennae 15-16-jointed (rarely 

 with 17 joints) ; wings whitish ; legs and abdomen darker brown 

 than in the ? . Length, f-1 ; exp. U-2 lines. Haliday. 



Like the preceding, this species attacks some of the 

 pucerons of the willow ; those that are wounded may be 

 recognised by their pale brown colour ; they retire to the 

 extremities of the leaves. The majority of them nourish, 

 beside the Aphidius, an Allotria with a red \\e2idi{fidviccps, 

 Curtis), or some other species which cannot now be deter- 

 mined. Haliday observed also some still smaller 

 species of Aphidius on Daucus carota, the carrot, which 

 seemed to him to be A. salicis. But see no. 38, A. dauci. 



32. Aphidius cxiguus, Haliday. 



A, mi/wws, ^ Hal., lib. cit., 104,^; Marsh., lib. cit., p. 



595, t ?. 

 ? A. fumatus, Hal., lib. cit., $. 



$ Black ; abdomen pale at the base and in the middle ; 1st segment 

 yellow. Oral parts ochreous. Antennae a little longer than the head 

 and thorax, slightly incrassated towards the apex, 13-jointed. Wings 



