389 



mixing with those of Macrosiphum fisi Kalt, in some cases 

 and in others alone. It also now and then occurs with the 

 Black Dolphin or Collier {Aphis rumicis Linn.) on broad beans 

 in a similar way. In those districts where I have known it, 

 near Great Staughton in Hunts and at Wye in Kent, and vears 

 ago at Kingston-on-Thames in Surrey, it was always common 

 on Lathyrus sylvestris. Last year 1 removed a colonv from the 

 latter plant in June and placed them on peas and broad beans 

 in my garden. They flourished to an alarming extent on both 

 plants. Those on the beans became winged in July and left. 

 Watch was kept on two large masses of Lathyrus in the neigh- 

 bourhood, and I found that from June 30th to Juh' 20th winged 

 females appeared, and from then onwards I saw no trace of them 

 on the peas. From that date onwards these insects flourished 

 on Lathyrus as in the spring, and in November I found ova 

 low down on the haulm. It is thus clear that this handsome 

 Dolphin also migrates between the wild Everlasting Pea 

 {Lathyrus sylvestris) and the cultivated peas and beans. I 

 tried to cultivate the summer brood from peas on clovers, and 

 on a white Everlasting Pea a variety of Laihyrus latijolius, but 

 without success. 



These two cases show what we may naturally expect — that 

 the insects of this group found on the annual plants pass the 

 winter on the perennials so as to ensure their continuitv of 

 existence. 



Moreover the host plants do not seem to be ver\- varied, 

 and certainly do not pass out of the Papilionaceie, as we see 

 is done by the third species sometimes found on the peas, the 

 Black Fly, or Aphis rumicis, which has such a vast number of 

 food plants, ranging from the dock and onion to the mangold, 

 bean, poppy, and chamomile, and even apples. 



BucKTON {Mono. Brit. Aphid., i., 188) placed this Aphis 

 in a new genus, Mcgoura, which was certainly justified. 



ScHOUTEDEN {Cat. Aphid. Bclg.. p. 240) sinks this genus 

 under Amphorophora Bückten, in which I cannot agree, as 

 Buckton's type of the latter genus — Amphopophora ampullata 

 Buckton, is an insect of totally different faciès. 



BucKTON says his M. vicier is ccrtainl\- mithtr Kocn's 

 Siphonophora vicia- iv>v Kai.tenb.ach's Aphis viciw. I am fully 



