THE CANADIAN ENTOMOLOGIST 233 



APHIDID^ FOUND ON THE APPLE IN BRITAIN 



AND TPIE 



DESCRIPTION OF A NEW SPECIES FROM AFRICA. 



BY FRED V. THEOBALD, M.A. 



(Continued from Page 213). 



Aphis (Myzus) nigra, nov. nom. 



Aphis oxyacanthce Koch (non Schrank). 



Myzus oxyacanthce Schonteden. 



Koch, Die Pflanzen, p. 55, figs. 70, 71, 1857. 

 Schonteden, Les Aphid. Palaearct., p. 173 (190?). 

 Theobald, Entomologist, XLIV, p. 404, 1911. 



This aphid was found by Koch and described from specimens 

 on Pyrus pyraster during May. 



It has so far been found in Britain in two localities; once at 

 Mortimer, Berkshire, on apple trees (12, VI, 1911) and at Wye 

 on apples (2 and 20, VI, 191 Ij and on Hawthorn (6, VII, 1907). 



From notes sent me, it appeared to have been abundant on 

 apple trees at Mortimer, with A. cratcegi, but later at Wye in the 

 same year I found it in several large colonies on apples, living 

 under the leaves of -some Worcester Pearmains and a Peasgood 

 Nonsuch, and previously in the same locality on Hawthorn hedges. 

 I have only seen apterous females, but Koch describes and figures 

 the alate viviparous female. 



Apterous viviparous female: 



Black and shiny; antennae black, not half the length of the 

 body, of six segments; the 1st wider than the 2nd, scarcely longer; 

 the 3rd nearly as long as the 6th, 4th and 5th about equal, basal 

 area of the 6th nearly half as long as the flagellum; the last two 

 segments and most of the 4th markedly imbricated. The legs may 

 be all black, but now and then the tibiae seem to be paler on their 

 basal two-thirds. 



Alate viviparous female : 



Described by Koch as being all black, except the tibiae, which 

 are yellowish, except at their apices. There are four pairs of lateral 



July, 1916 



