On the Life-History of Helicosporidium parasiticum, n.g., n.sp., a new type of Protist parasitic in the Larva of Dasyhelea obscura Winn. (Diptera, Ceratopogonidae) and in some other Arthropods

Abstract

The usual host of this new parasite, Helicosporidium parasiticum, is the larva of a Ceratopogonid, Dasyhelea obscura Winnertz, which lives in the decomposed sap filling the wounds of trees—elm and horse-chestnut. All the material used for this study was derived from the wounds of two trees only: (1) an elm tree standing on the Caius College ground at Newnham, facing Church Rate Walk, and (2) a horse-chestnut standing between the School of Agriculture and Downing College.