74
WORMS
T R I A E N O P H O R U S NODULOSUS, (Pallas) is a well-known parasite of pike, though there are very few records of its occurrence in this country. The first larval stage of this species of tapeworm occurs in water-fleas, principally Cyclops. T h e second stage, the plerocercoid, forms subperitoneal cysts, particularly on the liver, in various cyprinid fishes. When fishes infested with the plerocercoids are eaten by pike, the vvorms develop to the adult stage, usually in the intestine. C.
NOTES ON BRITISH LEPIDOPTERA FOR 1952 BY BARON DE W O R M S , M . A . ,
PH.D.,
F.R.E.S.
I HAVE thought it might be of interest to put on record a resume of the past season, 1952, so far as our lepidoptera are concerned so as to give some idea of the relative abundance of various species and also the general trend of the year which rray be said to have opened with quite an eclat. Düring the last days of February a few Painted Ladies (Pyrameis cardni, Linn.) appeared on the south coast to be reinforced by an almost unprecedented immigration of these butterflies during the first days of March. Hundreds were seen Coming in over the sea in Sussex. Flower beds in gardens on the south coast were smothered with these fine insects. The invasion seems to have extended over the whole of our southern shores as far as Western Ireland and during March well over a thousand P. cardui, Linn., were recorded, some from as far north as Scotland. Coupled with this amazing incursion were several other migrant species of moths. T h e Small Mottled Willow (Laphygma exigua, Hübn.), was obtained in some numbers at light over a wide area in the south. Several of the Bordered Straw (Heliothis peltigera, Schiff.), were taken, one in Piccadilly, while some ten specimens of the rare Ni moth (Plusia tti, Hübn.), were recorded in many of the southern counties and in one instance ova were obtained and a Iarge generation subsequently bred. There were also several of that great wanderer, the Striped Hawk (Celerio li-comica, Esp.) One was caught in Lancashire in mid-March. Most remarkab'e of all was the capture of two moths belonging to quite an exotic species identified as Tathorhyncus exsiccata, Lederer (vide Ent. Record, 1952, 64, pp. 131 /2). This species which had never before been seen in the British Isles has its habitat in the Oriental regions and Eastern Mediterranean. It is of interest to note that a specimen of this