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



mcnnm, the common woodbine. Others were reared 

 out of Siphonoj)hora pisi, Kalt. infesting Silcne infiata, 

 bladder-campion ; and a $ , the smallest of all, out of 

 Siphonophora urtice, Kalt. taken on a nettle, Urtica 

 dioica. 



12. Aphidms avenie, Haliday. 



A. avenm, Hal., lib. cit., 99, ^ $ ; Curtis in Morton's 

 (Jyclop. Agric, s. v. Aphis, pi. xvii, ff. 5, 6 ; Farm 

 Ins. pp. 290, 291, pi. xxxix, f. 12, and pi. J, f. 12; 

 Marsh., lib. cit., p. 573, ^ $ . 



A picipes, Nees, Mon., i. 18, ^ ? . 



? A. infirmus, Nees, I.e. ^ $ . 



?^. vulgaris, Bouche, Naturg. (1834) 161. 



lA Protc'eus,W esm., Nouv. Mem. Ac. Brux. 1835, p. 

 75 ; Ratz. Ichn. d. Forst. iii. 62 (partim). 



5 Black, with the 2ncl suture fulvous or rufous, and the apical 

 segments testaceous. Head as wide as the thorax : mandibles 

 testaceous ; palpi obscure. Antennae 17-18-jointed, shorter and 

 stouter than those of the following species, black, with the end of 

 the 2nd joint and base of the 3rd, narrowly testaceous. 

 Mesothoracic furrows distinct ; metathorax shining, subrugulose 

 posteriorly, areated, carinated in the middle. Wings hyaline, with 

 stout and distinct nervures ; squamulse and radicles testaceous ; 

 stigma fulvous, becoming pale brown after death ; nervures fuscous ; 

 cubital nervure complete to the end of the 1st cubital areolet. Legs 

 in great part fuscous or blackish ; fore femora and tibiae rufescent or 

 testaceous, sometimes streaked externally with fuscous ; 4 posterior 

 leos with the 2nd joint of the trochanters, both ends of the tibiae, and 

 base of the tarsi, testaceous. Abdomen lanceolate, compressed 

 towards the extremity, black, shining, with a transverse band more 

 or less pale on the 2nd suture, and segments 5-6 testaceous. 

 Valves of the terebra black. ^ similar to the ^ of rosx (sp. 10) ; 

 palpi blackish ; antennae 20-21 -jointed, as long as the body ; legs 

 darker than those of the $ ; abdomen black at the extremity. 

 Length, U ; ex p. 3 lines. 



This and the following are the largest species, after the 

 Pinicolse (spp. 3-7) ; they are common everywhere, and 

 polyphagous, preying indiscriminately upon various kinds 

 of Aphis. The present species has attracted the attention 

 of several continental describers, and received different 

 names : there is not much doubt that picipes, Nees, is 



