53 



from the posterior in texture). All the hemiptera, 

 we must bear in mind, are sucking-mouthed insects, 

 which are provided with a long proboscis, which 

 they insert into the tissue of the plant and suck 

 out the sap (haustellate insects). We must also remem- 

 ber that they develop by an incomplete metamorphosis, 

 and thus feed during the whole of their life. Many, as 

 we know only too well, is the case with the Plant Lice, 

 are very harmful to vegetation. They have most remark- 

 able reproductive energy, increasing very rapidly at 

 certain times and under certain favourable conditions, 

 which at present we cannot foretell, and about which we 

 know little or nothing. 



Green Fly or Rose Aphis (Siphonophora dirhoda, Siphonophora 

 rosae, Siphonophora rosarum). 



The Rose Aphides or Green Fly belong to three 

 distinct species mentioned above. As is too well known, 

 they are the bane of the Rose grower's life, owing to their 

 extraordinary rate of increase, and their persistent attack 

 resulting in serious damage to the young shoots. 



A general account of Plant Lice will cover all but a 

 few details to which the Rose grower has to contend 

 with. 



The Aphides are insects which exist as species in 

 several different forms. There are winged and wingless 

 races of females, and the winged females may be of two 

 kinds those which produce their young viviparously and 

 those which deposit eggs. Then there are males, which 

 may or may not be winged. 



The simplest form of Aphis is the apterous female. 



