392 Insect Pests. 



The young emerge on the underside of the leaf, and grow rapidly. 

 There are four moults in the nymph stage. At first the young are 

 very pale, but gradually become yellowish as the wing buds develop. 

 The whole period of growth lasts from five to six weeks, the com- 

 plete life-cycle probably taking fifty days. 



They may keep on breeding until the first week in October, but 

 in very small numbers after the middle of September. 



Until they are mature these leaf hoppers are very sedentary, and 

 even when adult do not jump as do other members of their tribe. 



The distribution of Typhlocyba qucrcus in Britain is probably very 

 wide. Edwards (6) gives the following localities : Norwich and 

 Cotswold districts, Ireland (Haliday), Renfrewshire (Young), Dalling- 

 ton Forest, Totteridge, Barnet (Butler), Glanvilles Wootton (Dale). 



During 1906 and 1907 specimens were received from or taken 

 in various places in Kent, Surrey, Sussex, Devonshire, Somersetshire, 

 Worcestershire, Herefordshire, Monmouthshire, Huntingdonshire and 

 north Wales. 



Amyot (2) (Ann. Soc. Ent. France, II., se. V., pp. 230-495) 

 describes this insect as T. flamrniyera. 



THE YELLOW LEAF HOPPERS. 



(Chlorita flavescens* Fabr., and C. viridula, Fall.) 



Two species of Chlorita occur in abundance, namely, C. flavescens, 

 Fabricius, and C. viridnUf, Fallen. Of these two, the latter seemed 

 by far the most abundant, but both usually occurred together. The 

 differences lie mainly in the male genitalia, but, roughly, when fresh 

 they may be separated by the pale area on the anterior wings, the 

 so-called suprabrachial area being hyaline throughout in flavescens, 

 hyaline at the apex only in firididt'. 



These insects swarm in greater numbers than the Typhlocyba in 

 most districts from which reports have been received. 



One correspondent wrote from Southfleet on the 6th of August, 1906, 

 that his pickers had refused to work owing to the swarms of leaf 

 hoppers, which got into their eyes, ears, nose, and were drawn in at 

 every breath. They had appeared in this manner several years 



* The following is the synonomy of this species : Typhlocyba rosse, 

 H. Sch. (D. Ins., p. 124-1). Eupteryx flavescens, Marsh, Ent. Mo. Mag., III., 

 p. 220-6. Typhlocyba flavescens, Flor. (Eh. L., II., p. 394-9). Cicadula 

 flavescens, Sahib. Not. Feim., XI., p. 161-3. Chlorita flavescens, Fab. Gli. 

 Insetti. No., p. 154, vol. IV. 



