The Zoologist— February, 1870. 2001 



named Chromaphis peglaudicola live scattered on the under surface of the leaf like the 

 species of Myzocallis. 



Pterochlorus (S. S. 1329).— This genus follows Stomaphis and is Koch's Drj'obius, 

 and the latter name has the precedence. There are only two species known, D. roboris 

 and D. longipes, the former a native of North Europe and the latter of South Europe. 

 The slight difference between ihem may have been the effect of climate. 



Phyllaphis Fayi (S. S. 1329). — The genus of which it is the only representative 

 should be removed from the Lachuinse. The latter may be generally separated from 

 the Apliidinae by the greater length of the rostrum in proportion to the body, a 

 character which also distinguishes the early age of the Aphidina from their final state. 

 Phyllaphis may perhaps be associated with Drepanosiphum, Euceraphisand Monaphis 

 as a f;roup of Aphidinae. 



Euveraphis, Walk. Type A. Betulae, Linn. — Aphis punctipennis (Zetlerstedl, 

 Ins. Lapp. i. 2, 311) belongs to this genus. It feeds on the birch and on the 

 alder, and inhabits Lapland and Greenland. I have found it on the alder at 

 Chamouni. 



Monaphis, Walk. Type A. antennata, Kallenbach. This genus is most allied to 

 Euceraphis, but its peculiar structure sufiBciently distinguishes it. The scarcity of its 

 occurrence and its solitary habits are in remarkable contrast to the generality of the 

 Aphidids. 



Schizoneura laniyera (S. S. 1330). — It is generally limited to the trunk and 

 branches of apple-trees, but it sometimes occurs in abundance on the young shoots. 

 It is the American blight about which much has been written and for which many 

 remedies have been proposed. 



Pemphigus (S. S. 1330). — Passerini describes many new species of this genus 

 and distinguishes them by the difference in the length of the joints of the an- 

 tennae. In the Aphidinae this character is occasionally variable in individuals of 

 one species. 



Vacuna dryophila (S. S. 1332).— Thelaxes has the right of priority as a generic 

 name for this species, and the genus Vacuna may be restricted to V. Alni. V. dryophila 

 appeared more abundantly than usual in 1869 near London, and I also observed it in 

 the Isle of Man. 



Vacuna Alni (S. S. 1332). — Until I saw Passerini's work I was not aware that this 

 species fed on the alder as well as on the birch. I have since found it in abundance 

 on the alder at Chamouni, but in England I have only observed it on the birch. It 

 is the Aphis Alni of Schrank, the Vacuna Betulae of Kallenbach, and the Glyphina 

 Betulae of Koch. 



Chermes Abietis (S. S. 1333).— The winged form is developed in the middle of 

 August, and is then abundant on the spruce fir. The natural history of the species of 

 this genus is very interesting and has been only slightly noticed in English publi- 

 cations. 



Francis Walker. 



Elm Hall, Wanstead, Essex. 



SECOND SERIES — VOL. V. 



