76 Zoology 



spp., inquilines in Rhodites galls. Diastrophus ruhi Bouche and Xestophanes 

 potentillae ViU. are known; but the oak fauna is almost untouched. The 

 commonest Figitidae are known, but not much can be said of the other 

 parasitic forms. 



Of Ichneumonidae, 452 species are known, a number of which were first 

 British records. Many species are attracted to the flowers of UmbeUiferae, 

 which are conspicuous along roadsides and in meadows. Aritranis carnifex 

 Grav., Epiurus melaiiopygns Grav., and Dihlastoinorpha bicomis Boie., are 

 characteristic fen species; also Heiniteks hakeatus Thoms., known in Britain 

 only from Wicken Fen and the Norfolk Broads. Tufts of Deschampsia 

 caespitosa, in fens and poor wasteland, provide winter quarters for the 

 females of numerous species. 180 Braconidae have been identified, the 

 majority by the late G. T. Lyle. Only 28 Serphoidea are known; and the 

 hst of 60 Chalcidoidea is almost entirely composed of species bred in the 

 course of general biological work. 



OTHER ORDERS. Among the smaller orders a beginning has been 

 made by Dr C. H. N.Jackson with the Collemhola. From among a total of 

 over 150 British species of this order, some 5 5 have been found in the County, 

 where they have been mosdy collected in Wicken Fen and near Cambridge. 

 Among the Orthoptera, several of the rarer species have not been found for 

 many years. The most notable recent record is that of the great green 

 grasshopper [Tettigonia viridissima), which has been found at Madingley 

 by G. C. Varley. The Ephemeroptera have been but litde collected, and 

 records of only 13 species are apparently known. Out of a total of 44 

 British species of Odonata, 27 kinds have been found in Cambridgeshire; 

 most of the recent records are due to the late W. J. Lucas and J. Cowley. 

 About half the recorded British species o£ Psocoptera (booklice) have been 

 found in Cambridgesliire by R. M. Gambles and others. Although a few 

 rare species occur in Wicken Fen, there are none that are pecuhar to the 

 County. Knowledge of the Hemiptera-Homoptera is still scanty, and much 

 work needs to be done on this suborder before an adequate idea of its 

 representatives can be ascertained. In the Neuroptera, some 34 species out 

 of a total of 57 British forms have been recorded. The snake flies Raphidia 

 xatuhostigina and R. maculicoUis occur in woods, while Sisyra fascata may 

 be found around Cambridge and at Wicken Fen, and probably elsewhere, 

 along with the freshwater sponges with which it is associated. The 

 most notable member of the order is the very rare Psectra diptera, an 

 example of wliich was taken in Wicken Fen in 1934 by H. Donisthorpe. 

 Of the Mecoptera, aU three British species o£Panorpa occur, P. cognata being 

 recorded from Fleam Dyke. The Trichoptera or caddis flies are well 

 represented, especially in Wicken Fen. The most interesting records are • 



