The Zoologist — Februakv, 1870. 1997 



punclured. Antennte longer than the body; tips of joints black. Nectaries about 

 one-fifth of the length of the body, converfjiiift- lowards each other. Legs long, 

 slender; tarsi and lips of femora and of tibiae blackish. Length | line. 



M. Ribis (S. S. 11-22). — This species is more widely diflferent from M. Cerasi, the 

 type of Myzus, than the latter is from ihe genus Aphis as it is now limited. A new 

 generic name is therefore required for it. It is the common Aphis of the red currant, 

 which, like the black currant and the gooseberry, is also infested by the three following 

 species : — 



1. Khopalosiphum Lactucse (S. S. 1118). Aphis Lactucae, Kallenhach ; Rhopalosi- 



phnm Ribis, Koch. — Koch refers to this species the Aphis Ribis of Linne, of 

 Schrank and of Kaltenbach. 



2. Aphis Ribicola, Kaltenbach. This and the following species have not hitherto 



been recorded as British. It should be transferred to the genus Myzus. 



3. Aphis Grossulariie, Kaltenbach. In 1869 I found this species in abundance. 



Koch correctly mentions his Siphonophora Ribicola as the Aphis Ribis of Linne, of 

 Frisch and of Fabriciiis, but it is also the Aphis Ribis of Kaltenbach, and not the 

 A. Ribicola of that author. 



M. Mahaleb (S. S. 1122). — The sloe is certainly the permanent habitation of 

 Phorodon Humuli, and I still believe that the latter is Aphis Mahaleb, Funsc, though 

 Passerini stales that it is not so. 



Hyalnpterus Pruni (S. S. 1123). — This is one of the species whose history is yet 

 incomplete, notwithstanding the excessive abundance in which it occurs. H. tetra- 

 rhoda may be removed from this genus, which is connected by some intermediate forms 

 with Atlieroides, but has most aflBnity to Phorodon. 



Aphis Saliceli (S. S. 1296). — Na English descriptinn of this species has yet been 

 published. It occurs occasionally in large swarms on the shouts of the willow, and is 

 remarkable on account of the various colours which it assumes. It often has an 

 orange hue. 



A. Cardui (S. S. 12^)7).— It is more allied to the genus Myzus than to Aphis; 

 and is less abundant than many species, and no English description of it has yet been 

 published. Apterous female. — Green, oval, very plump and shining, with slight black 

 bands. Antennae slender, whitish, blackish towards the tips, much shorter than the 

 body. Abdomen wholly black, except towards the base. Neclaries black, about one- 

 eighth of the length of the body. Legs whitish ; femora, tarsi and tips of libise black. 

 Var. — Body wholly black. Winged female. — Black. Antennae very much shorter than 

 the body. Abdomen green, with black bands. Nectaries black, about oue-fifih of the 

 length of the body. Tail rather long. Legs green ; femora towards the tips and tarsi 

 black. Far.?— On Senecio Jacobaea. Pale red, or with the disk of the body shining 

 black. Nectaries not more than one-tenth of the length of the body. 



A. Sedi (S. S. 1297).— This is a very small species and not of frequent occurrence. 

 I have considered it and many others that have been described by different names as 

 variations of A. Rumicis. Nearly all the migratory species of Aphidinae are definite 

 in their selection of plants fur their new habitation, but A. Rumicis in the winged 

 form is extremely indiscriminate as to where it alights and niultijilies. Sometimes 

 the ofifspring perish quickly, sometimes they linger for awhile; in other instances they 

 thrive more or less and are altered by their food, but their existence does not pass into 



