74 Zoology 



Chymomyza costata Ztt. Chippenham Fen is also at present the only locaUty 

 (in addition to Spain) where the very tiny Dohchopodid described by 

 Strobl as Micromorphus alhosetosus is known to occur. 



On the chalkland of the south, the Devil's Dyke and Fleam Dyke are 

 excellent locahties for the downland species associated with chalk. Here, 

 rare Tachinids may be obtained such as Lydella angelicae Mg., Deinoticus 

 plebeitis Fin., Zophomyia femula Scop., Neaera atbicollis Mg., and Ocyptera 

 interrupta Mg., as well as many species of Sarcophaga. It was here that the 

 newTrypetid Trypeta (Ceriocera) microcera, recendy described by Dr Hering 

 of Berhn, was found by Mr G. C. Varley hving in the stems of Centaurea 

 scabiosa, while many other interesting Acalyptrates occur. 



The clayland woods (see Fig. 29) begin at Woodditton, and their asso- 

 ciated insects are naturally different from those of the rest of the County. 

 Among die Syrpliids, Chilosia maculata Fin. is common on the wild onion; 

 Phtychirns tarsitlis Schum. is common on the flowers of Gewn rivale, while 

 the rare Chilosia ptibera Ztt. and fasdata Egg. have also been taken. The 

 peculiar plant Paris qtiadrifolia is the host plant of the Cordylurid Paralleloinma 

 paridis Her. Interesting Tachinids such as Camplyoclmeta praecox Mg., Actia 

 nigrohaherata ViU., and Blepharomyia ampUcornis Ztt. have occurred; wloile 

 the rare Xysta cana Mg. has been taken at Kirding not far away. Among 

 the Acalyptrates, the rare Acartophthalmiis bicolor Old. was once foimd in 

 Woodditton Wood sitting on dead twigs at the bottom of a dense thicket. 



An account of the Diptera of Cambridgeshire would not be complete 

 without mention of some of the captures of the late Francis Jenkinson of 

 Cambridge. Particularly interesting was the occurrence of two very little 

 known Tachinids [Stenoparia monstrosicornis Schin., and Helocera delecta 

 Mg.) in his garden, but he also found at Cambridge the large Pipuncuhd 

 already mentioned — Nephrocems Jlavicornis Ztt. — and the Drosophihd 

 Acletoxerms formosus Lw., together with many other good species too 

 numerous to mention including (in 1901) the rare Tachinid Stomatorrhina 

 lunata F., which is probably only an occasional visitor to this country. 

 Finally, Jenkinson and other Cambridge entomologists have proved that 

 many of the rare species associated with rotting wood are to be found in 

 and about the very old trees of the College Gardens and along the Backs. 

 These include such species as the Syrpliids Mallota cimbiciformis Fin., and 

 Pocota apiformis Schrnk., the four species of the Dolichopid genus Systenus, 

 as well as many Anthomyids and Acalyptrates which frequent sappy 

 exudations. 



HYMENOPTERA.^ Although our knowledge of the Hymenoptera 

 of Cambridgeshire is in advance of that of most counties, it is considerably 



• ByG.J. Kerrich, M.A. 



