Insects, etc., Injurious to the Plum. 



3S1 



Aphis juiiiii. 



to wingless vi\'ipar(jus females, 



duced by the dull pur[)le " iiiother-(|ueuu " are green, and when they 

 became mature vivi|iar(jus wingless females Uiey vary from olive- 

 brown to green, the alido- 

 men has three faint green 

 stripes, anteniue. olive- 

 brown and cornieles l)ri)wii. 

 This asexual reproduution 

 of wingless forms goes on 

 for some time and, under 

 favourable conditions, to 

 sucli an extent that the 

 leaA'cs which have gradu- 

 ally curled up die off. As 

 food srrpply comnrenccs to 

 fail, these lice, instead of turninii 

 enter a pupal stage, rudiments of wings, " wing buds," appearing. 



The pupa is shining green and dull yellowish, the wing cases 

 tipped with dark brown ; green cornicles also tipped with Idack. I 

 have observed the pupal form in the first week in June, aird again in 

 July. Sometinres all on a tree enter this stage at once, at others 

 only a few. 



The winged female coming from the pupa is also viviparous ; in 

 colour she is apple-green, with black head, thorax and antenrraj ; on 

 the green abdomen is a dark patch and dark lateral spots ; the Mungs 



are iridescent with brown \'eins. 



These winged viviparous females 

 fly away. What hapjicns alter their 

 leaving the prunes in June ^"e do 

 not know, but tlie\' certainly do so 

 and return again in tlie autumn 

 as winged feniales wliich produce 

 vouug wdiich e\"entually giw origin 

 to males and females. 



Tlie winged male is small, and 

 witli a, dusky ochreous liody, with 

 dark brown liead, markings on tlie 

 thorax, and tliree on the abdomen. 

 Tlie coloirr varies consideraljly, some 

 males being almost black, some 

 wholly black, according to Buckton. 

 The oviparous female is apterous and pale )-ellowish-gTeen, almost 

 transparent, with brown cornicles. This fenrale, after lieing fertilised 



25.3.— i.ATEii ,st.h;e iir 

 (viviiiavcu.s female). 

 (Greatly enlarwd.) 



