68 Zoology 



teristic of the Northern Palaearctic region. An interesting species found 

 at Wicken is Glaenocorisa cavifrons, which, apart from a larger darker 

 form long known from the Scottish Highlands, has a restricted range in 

 Britain. Four forms of Notonecta occur, while Naucoris cimkoides and 

 Ranatra linearis are frequent in ponds. Cambridgeshire is not well provided 

 with running water, but where it is found, as in the River Cam, Velia 

 currens (Vehidae) and Hygrotrechus najas (Gerridae) are common. The five 

 other Gerrids found in Cambridgeshire are inhabitants principally of 

 standing water. 



Turning to the land bugs, Chartoscirta elegmttda, which in Britain is 

 restricted to four counties only, is found at Wicken. Other species, 

 recorded there and not elsewhere in the County, are Hebrus ruficeps, 

 Myrmedohia tenella, Pamerafracticollis, Teratocoris antennatus and T. saundersi, 

 Adelphocoris ticineiisis, Eurygaster maurtis, Cyrtorrhimis gemitms and C. 

 pygmaens. Chilacis typhae occurs at Wicken and elsewhere where the reed- 

 mace grows. Dolicoiiabis lineatus is frequent on reeds, and Oncotylus 

 viridinervus is found on Centaurea in fen pastures. 



Characteristic species of the chalklands are Calocoris roseomacuhtus, 

 Poeciloscytus unifasciatus, and Myrmus miriformis. Amblytylus affinis, Otiy- 

 chunemus decolor, Hoploinachus thunhergi, and Halticus apterus, often occur in 

 some numbers. Eremocoris podagricus has been recorded from near Royston, 

 and two species oiBerytus with Metacanthus punctipes are frequent, especially 

 where the chalk bears hawthorn scrub. Where the fields are bounded by 

 screens o{ Pimis, there appears an intrusive population of conifer-dwellers, 

 such as Gastrodes ferrugineus and Acompocoris pygmaeus. 



The claylands sometimes bear deciduous woodland.^ As the Heterop- 

 tera here have been little studied, it is possible that additional species await 

 discovery. Various Pentatomidae occur, such as Eusarcoris melanocephalns, 

 Palomena prasina and Gnathoconus albomarginatus ; while other characteristic 

 species are Macrotylus solitarius, Macrolophtis nubilus, and Calocoris ochromelas. 



In the fruit-growing districts, the Capsids Plesiocoris rugicollis and Lygtts 

 pabuliiiHS are pests of apple and currant. Other species of interest in the 

 neighbourhood are Reduvius personatus, wliich is sometimes taken at dawn 

 in the town; and the bird and bat parasites, Cimex columbaritis, Oeciacus 

 hinmdinis and Cimex pipistrelli, which were first described byjenyns from 

 Cambridgeshire.^ 



LEPIDOPTERA} For at least two centuries Cambridge and its 

 neighbourhood have been celebrated for their butterflies and moths, and 

 although some of the more interesting species have now become extinct, 



' See p. 52 above. * See p. 60 above. 



3 By J. C. F. Fryer, O.B.E., M.A. 



