HOP AND PLUM APHIS. 



151 



The figure below shows the appearance of the [slaty-grey 

 six-legged grubs (magnified, with line giving length when 

 full-grown). These grubs are prettily marked|with scarlet 



CocciNELLiD^. — 1-4, egg, magnified; larva and chrysalis, magnified, and 

 with natural length; 7, Coccinella hipunctata ; 8, G. ditipar ; 9, G. septem- 

 punctata. 



and yellow, and when full-fed, which is in about a fortnight 

 or three weeks, they hang themselves up by the tail, and turn 

 to a shiny black pupa or chrysalis, spotted down the back 

 with orange, from which the beetle (known as the " Lady- 

 bird") comes out in about another fortnight or three weeks. 

 The figures give the common red Ladybird, distinguishable 

 by its seven black spots, and also two smaller kinds. 



These should be by all means protected, and especially 

 when they appear in the vast swarms in which they frequently 

 follow on a special outbreak of aphides, and in which, to our 

 great injury, they are liable to be swept up and destroyed, as 

 in the instance of their great appearance in 1869. 



Hop Aphis; Hop and Plum Aphis. 

 Phorodun humuli, Scbrank, and var. maluheh, Fonsc. 



The genus Phorodon, to which Phorodon humuli, commonly 

 known as the Hop Aphis, belongs, is especially distinguished 

 by the first joint of the antenna being bluntly toothed or 

 gibbous, and by also possessing frontal tubercles having a 

 strong tooth developed on the inner side, as conveyed to 

 some degree in the figure (p. 152) of the wingless viviparous 

 female. 



The winged viviparous female of P. hwmdi is of a pale green 

 colour, lighter underneath ; head and band on prothorax dark 

 brown, some other markings on the thorax black ; abdomen 

 with one or more cross stripes and four spots on each side 



