SCIENCE- G OS SIP. 



J91 



Centranthus riiher DC. — On an embankment at 

 Mickleham, near Leatherhead. 



Serratula tinotoria Linn. — In wood near East 

 Horsley railway station ; also found in lane near 

 Ashtead railway station. 



Arnoseru pu&illa Gar. — A sandy field near Send. 



Pliytemna orbioidare Linn.— Leatherhead Downs. 



Pyrola mmor Linn. — \\\ a copse at Burnt Com- 

 mon, Eipley. 



Hottonia 'palustris Linn. — Found in brook near 

 the Anchor Inn, Pyrford, Ripley, June 4th, 1898. 

 Occurs in ponds near Newark Abbey, Ripley. 



Primula elatior Jacq, — In a meadow. East 

 Horsley. 



Lysimaclila vulgaris Linn. var. punctata. — On the 

 banks of the Mole, Leatherhead. 



Anagallis tenella Linn. — This beautiful perennial 

 may be found on a bog near the Tower, Leith Hill. 

 August 1899. 



GenfAana amarella Linn. — The Downs, East 

 Clandon. 



Chlora perfoliata Linn. — At Boxhill, Surrey. 



Cascida europaea Linn. — On stinging-nettle at 

 Leatherhead. 



C. epithymum Linn. — Growing on Erica ci)wrea 

 at Leith Hill on August 9th, 1899. 



Cynoglosstim officinale Linn. — Norbury Park, 

 near Leatherhead ; and at Boxhill. 



Antirrhinum oro?itin>n Linn. — At Elm Corner, 

 near Ripley ; and at Pyrford, Woking. 



Atropa belladonna Linn. — Near Cherkley Court, 

 on the Roman road, Leatherhead. Mr. Carrington 

 finds it on the range of hills south of East Horsley. 



Pedicularis sylvatioa Linn. — At Bookham Com- 

 mon and on Wisley Common. 



Salvia verbenaca Linn. — At Great Bookham, 

 Townshott Close, and in fhe churchyard. 



Mentha pulegiuni Linn. — At Jacob's Wells, near 

 Guildford. 



Scutellaria minor Linn. — Near Elm Corner, 

 Ripley. 



Ajuga chamaepltys Schreb. — On the Downs, 

 Mickleham, Leatherhead ; and at Great Bookham. 



Littorella lacustris Linn. — Pond near " The Hut " 

 Hotel, Wisley, Ripley. 



Thesium linophyllum Linn. — Near Dorking ; and 

 on the Downs, Merrow. 



Euphorbia amydaloides Linn. — Ranmore Com- 

 mon, near Dorking. 



Salix repens Linn. — Whitmore Common, near 

 Woking. 



Calla palustris.—On the edge of pond, Wisley, 

 "The Marsh Calla is common in the north of 

 Europe " (Professor D. Oliver). Watson, in " Topo- 

 graphical Botany," says it was planted " in the 

 neighbourhood of Cobham, Surrey," by a medical 

 man. It may have been introduced to this spot in 

 a similar way, if this is not his original locality. 



Alimia ranunculoides Linn. — Wisley Common, 

 Ripley. 



Daviasonium stellatum. Pers. — Down side, near 



Cobham, July 23rd, 1900. The summer of 1901 

 being very dry, the p^n;l where this annual grows 

 was dried up, and D. stellatum did not appear. 



Cephalanthcra grandiflora Bab. — Epsom Downs 

 Lane, Leatherhead ; and on the Downs, East 

 Horsley. 



Hahenaria bifolia Br. — Ranmore Common, near 

 Dorking ; and at East Clandon Downs, near 

 Guildford. 



Aceras anthropophora Br. — Copse on the Downs, 

 Guildford ; and at Boxhill. 



Opilbrys apifera Huds. — Horsley, Sheep Lees. 



0. mu&cifera Huds. — Horsley, Sheep Lees. 



Ruscus aouleatus Linn. — This plant is quite 

 plentiful on Great Bookham Common. 



Muscaria raoeinosum Mill. — On a bank by 

 Reigate Road, Leatherhead. 



2 Linden Villas, LeaMierhead. 

 February 8th, 1902. 



A DIPTEEOUS FLY. 



By Walter Wesche, F.R.M.S. 



rpHE casual observer will find little to attract 

 -L his attention in the small fly Siphona genicu- 

 lata. It is coloured in gentle half-tones of grey 

 and ochre, inclining towards a dull shade of yellow. 

 Two or three may be seen playing together round 

 low bushes, or sometimes in early spring on the 

 flowers of iris. Later the blossom of the privet is 

 a favourite feeding-place; whilst in the summer 

 and autumn they are attracted by the larger com- 

 posite wild flowers. Their flight is short and quick, 

 making it diificult to observe them. They are not 

 at all uncommon, and may be seen in most gardens 

 from May till October. Personally I have met 

 with them for several successive years in a garden 

 in South Hampstead, and lately many were seen 

 on wild flowers in an orchard at the base of the 

 Malvern Hills, in Worcestershire. It is about half 

 the size of a large house-fly (Mnsca domestiea), a 

 big specimen measuring about two lines in length- 



The head is bent downwards, giving the insect 

 a rather hump-backed appearance when viewed 

 from the side. In life the antennae are porrect — 

 that is, they stand out prominently from the fore- 

 head. A small black fly {Mei g e ni a, fl oralis), which 

 is also an inhabitant of gardens, has this same 

 characteristic ; it may be that the sense of smell is 

 highly developed in both these species. 



The male and female are only to be distinguished 

 from each other by a very minute examination. 

 In Diptera the male, in a very large number of 

 cases, is readily recognised by the width of the 

 ■" frontalia," the space which separates the com- 

 pound eyes. When the eyes are larger in the male 

 than in the female, a state which exists in the 

 majority of cases, this space is narrower. In many 

 instances the male eyes are so large that this space 

 in the upper part of the head is quite obliterated. 



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