i.m.] 127 



Bracliy coins frefpiens (Walker) (fig. 4, A, B). 



Aphis frequens Walker, Zoologist, vl, 1848, p. 2219. 



Oviparous Female.— hon^, narrowly oval, green, powdered with white ; 

 head of a darker green than the remainder of the body. Antemiae very short, 

 a little less than one-third the length of the body ; proportions of segments, 15 

 lo, 4/3, 26, 25 (25+35) ; a few scattered spines on all segments, 3 at the tip of 

 the spur. Head (in cleared specimens) densely chitinised, gently rounded in 

 front, with a few scattered spines. Rostrum reaching to the mid-coxse. 

 Abdomen with 7 pairs of submarginal spiracles, standing out clearly in cleared 

 specimens on account of the small chitinised areas surrounding them ; last two 

 segments as strongly chitinised as the head, whole dorsum with a few short 

 setae. Cornicles very short, no longer than broad, about half the breadth of 

 the base of the tail. Cauda normal aphidine, of medium length. Legs rather 

 short, hind tibia with about 20 small, circular sensoria ; length of hind leg : 

 femur •4 mm., tibia '52 mm., tarsus '18 mm. 



Total length 2-4 mm. 



The only specimens I have seen of this insect, in addition to those 

 in the Walker Collection, are several oviparous females fomid in November 

 1920 by Mr. H. Donisthorpe, who foimd them crawling on a seat 

 on Putney Common. The species is certainly congeneric with, but 

 I think distinct from, B. stellariae Buckt. Walker records it from 

 Artemisia maritima, but it has probably some other host-plant. 



Aphis hufo Walk. 

 Aphis hufo Walker, Ann. & Mag. Nat. Hist. (2) ii, 1848, p. 46. 

 I shall content myself at present with remarking that the species 

 standing under this name in our collections is a Lachnus. 



Rhopalosiphum eriophori Walk. 



A)Ms eriophori AValker, Ann. & Mag. Nat. Hist. (2) ii, 1848, p. 46. 



Hyalopterus eriophori {^NsWi.), Buckton, Men. Brit. Aph. ii, 1877, 

 p. 177. 



An examination of Walker's slide bearing the data in his hand- 

 writing "eriophori, on E. {Eriophorum) vaginatum Wicklow, Aug. 16, 

 1847," and which Buckton had for his description, shows that this 

 species is not a Hyalopteriis at all, but belongs to the genus Bhopalo- 

 siphmn. Through the kindness of Miss Jackson I have seen specimens 

 of the alate female ; this has got the cornicles distinctly clavate, much 

 more so than in the apterous form. As Miss Jackson is engaged on a 

 paper on this species, I shall say no more on the subject. 



April, 1921. 



