268 FOREST ENTOMOLOGY. 



Genus Retinia. 



The genus Retinia is found amongst fir-trees, and in certain localities 

 some species are quite dreaded enemies. In fact, it is possible that 

 a consulting entomologist may receive more specimens of Retinia 

 buoliana than almost any other insect for identification. This species, 

 being fairly well distributed, may be studied as a type form of the 

 genus. It is very easily hatched out artificially, more especially as it 

 is generally full fed before it asserts itself. 



Lepidopterists recognise seven or eight British species, but the 

 following is a synopsis of the important species : 



(a) In buds of Scots pine, with brownish-grey fore wings 



R. turionana. 



(b) In leading shoots of Scots pine, with yellowish-red fore wings 



and silvery cross lines R. buoliana. 



(c) Forming a gall of resin as a larval chamber. Fore wings dark 



brown-green, with grey dusty covering . R. resinella. 



(d) Making a " running " side destruction of leading shoot of larch 



or Scots pine. Fore wings brown, with dark-buff tip 



R. duplana. 



Ketinia turionana, Hb. (Pine-bud Tortrix Moth). 



This species has only once come under my observation as a pest 

 viz., in Delamere Forest, Cheshire. The infested pines were from 

 ten to twelve years of age, and the injuries were in the leading bud, 

 as shown in fig. 254. 



The moths hatched out early in June. They were from 16 to 

 18 mm. in expanse of wings. The fore wings were of brownish-grey 

 colour, with transverse lines. The hind wings were whitish. Head 

 and thorax ferruginous, and abdomen grey. 



The larvae are a yellowish-red colour, and rather less than half an 

 inch in length. 



'O 



Ketinia buoliana, Schiff (Pine-shoot Tortrix Moth). 



The habits of the larva are very much like those of R. turionana, 

 except that in buoliana the leading bud or whorl of buds are 

 not arrested in their early development, and therefore all begin to 



