184 A Stffdf/ oftlie Capsid Biujs foand on Ajyjde Trees 



different species. The measurements of the antennae and legs are not so 

 variable. 



An account of the life-histories of the various species is given below. 



3. CAPSIDS FOUNJ) ON APPLE TREES. 



In this country apple trees harbour a fairly large number of the 

 different genera of the Capsidae. From orchards near Wisbech and 

 Cambridge we collected seven different genera and two species of one 

 genus whilst other observers have recorded other species, e.g. Lygus 

 pralensis. 



The following is a list of the species found: 



Plesiocoris rugicollis 



■-1 



District Numbers 



Wisbech very abundant 



Cambridge „ „ 



. (Wisbech 

 Umiolylus margmahs -' , , . , 



I Cam bridge 



Psallus ambiguus 



f Wisbech „ ' 



{ Cambridge abundant 



- . , , ,. ( Wisbech few 



Atractotomus mail ^ , , ^ , 



(.Cambridge fair number 



Phytocoris ulmi and ( Wisbech few 

 Phytocoris liopuli (Cambridge ,, 



Wisbech ,, 



Pilophorus perplexa 



[ Cambridge 



. , . , ( Wisbech abundant 



Aetorhmus anaulalus -i „ , . , 



L Cambridge „ 



Remarks 



affected orchards on apples and 

 currants 



not found on apples but abundant 

 on currants 



affected orchards 

 unaffected orchards 



affected orchards 

 unaffected orchards 



affected orchards 

 unaffected orchards 



affected orchards 

 unaffected orchards 



affected orchards 

 unaffected orchards 



affected orchards 

 unaffected orchards 



As pointed out above, of these eight species, Plesiocoris rugicollis is 

 the only one which we have found marking the leaves, shoot or fruit and 

 therefore we shall deal with this species in greater detail. The adults of 

 all these genera can be easily identified (Saunders, Heteroptera), but it is 

 not always possible to recognise the genus in the earlier stages. 



The following characters may be useful in identifying the young stages 

 of the above species : 



Plesiocoris rugicollis hatch in April or early in May. 



Yellowish green becoming greener at each successive moult. 

 Terminal joint, of antenna pinkish brown. 

 Lips of dorsal abdominal gland well marked. 

 Mark the leaves with brown spots. 



