Diptera 175 



Helophilus frutetorum, P., and Xykta abiens, W. were once 

 taken in an odd half-hour's collecting, at a hedge of whitethorn 

 in blossom, under Woodditton "Wood. 



Before proceeding to enumerate the Diptera of the Fen 

 District some mention must be made of the Rev. E. L. Jenyns 

 of Swaffham Prior, who collected all Orders of Insects seventy 

 years ago in the immediate neighbourhood of his home. An 

 examination of the Diptera collected by him shows that he 

 took two or three species that have not been recorded from 

 the county since, such as Tabanus bovinus, L., our largest 

 British Dipteron, which he says was not uncommon at Ely and 

 Bottisham, Aty 'lotus rusticus, P. which he found at Cambridge, 

 and Thyreophora furcata, P. taken at Ely; he also took 

 Orthoneura brevicornis, Lw., Liogaster metallina, P., Chilosia 

 honesta, Rnd., Pyrophaena granditarsa, Forst., Catabomba 

 selenitica, Mg., Xanthogramma citrofasciatum, De G., Sphe- 

 gina clunipes, Phi., Eristalis aeneus, Scop., Gastrophilus 

 haemorrhoidalis, L., and Stenopteryx hirundinis, L. 



Specimens of Cecidomyidae, Mycetophilidae, and Chirono- 

 midae have been but little collected in the Fen District, 

 though one cannot help thinking that it would prove a good 

 locality for these families, especially Chippenham Fen for 

 Mycetophilidae. 



Among the Bibionidae : Scatopse bifilata, Hal. and S. coxen- 

 dix, Verr., Bibio leucopterus, Mg. (in swarms), B. venosus, Mg., 

 and B. lepidus, Lw. have occurred at Chippenham, and Scatopse 

 geniculata, Ztt., and inermis, Ruthe', at Wicken. 



Of the Limnobida^e: Limnobia analis, Mg., Acyphona 

 maculata, Mg., Molophilus ochraceus, Mg., Rhypholophus 

 varius Mg., Erioptera flavescens, Mg., Limnophila nemoralis, 

 Mg., and Pedicia rivosa, L., may be mentioned; while in the 

 Tipulidae the following have been captured : Tipula nigra, 

 L., T. longicornis, Schum, T. scripta, Mg., T. luteipennis, Mg., 

 and T. lunata, L. 



Among the Stratwmyidae the two large handsome species 

 of Stratiomys, viz. S. chamaeleon, L., and S. potamida, Mg. 

 occur sparingly at Chippenham, and S. furcata, F. has been 



