1. Previous attempts to feed the postlarval stages of the British harvest mite, Trombicula (Neotrombicula) autumnalis Shaw, are outlined briefly.

2. Methods by which mites were collected from the field are described and discussed.

3. The methods adopted for providing a suitable artificial environment in the laboratory, and the method by which feeding trials were conducted are described. The materials and organisms supplied as possible sources of food are listed, together with the results obtained when these were offered to nymphs or adults in controlled trials.

4. The feeding behaviour of adult mites in response to the eggs of an Entomobryid Collembolan, Sinella curviseta Brook, is described.

5. The nature of the probable diet in nature is briefly discussed.

6. The possible influence of ecological isolation on the evolution of polymorphic larval types is discussed.

7. The effect on the mite population of the destruction of rabbits, the principal vertebrate host in the experimental area, by myxomatosis is outlined.

The object of this communication is to focus attention on certain interesting facts concerning the mid-gut of the larva of Anopheles subpictus previously reported in outline by us (Dasgupta & Ray, 1954,1955). In the course of our routine examination on Anopheles larvae collected from different parts of the city and its outskirts, we directed our inquiry on certain histochemical problems. Our observation was mainly concentrated on detecting the sites of alkaline phosphatase activity in the mid-gut. Our interest, however, was quickly aroused by the occurrence in the secretory cells of the mid-gut of Feulgen-positive intra-nuclear inclusions. So far as we are aware, inclusion bodies of this nature have never been reported from Diptera.

1. A description is given of a new filarial parasite, Deraïophoronema freitaslenti n.sp. from the mesentery of the giant anteater, Myrmecophaga tridactyla, from British Guiana.

2. A proposed reclassification of Dipetalonema and related genera is given. Genera considered as valid are Acanthocheilonema, Breinlia, Dipetalonema, Mönnigofilaria, Deraïophoronema and Tetrapetalonema. Molinema is considered to be a synonym of Acanthocheilonema.

3. A new genus, Johnstonema, is erected for the reception of J. annulipapillatum (Johnston & Mawson, 1938).

The genus and species of Lygaeidae described and figured herein was obtained with several others from a squirrel's nest at Kodera, S. Nyanza Province, Kenya, East Africa, by Dr Garnham, Professor of Medical Protozoology at the London School of Hygiene and Tropical Medicine.

The development of Paramphistomum sukari Dinnik in a snail host is described with the emphasis laid on the succession of redial generation.

The sporocyst gives birth to about twenty to thirty rediae. These rediae of the first generation commence with the production of daughter rediae then enter the second phase of their productivity during which they produce cercariae. The daughter rediae, or the rediae of the second generation, repeat these two phases during their lives, commencing with redial production and after that changing to the production to cercariae. Both the first- and second-generation rediae are able to produce a few daughter rediae at the end of their life. There is evidence that the subsequent generations of rediae are also able to give birth to daughter rediae and cercariae.

As a result the successive generations of rediae maintain the infection in an intermediate host for a long time, probably as long as the infected snail can survive.

A checklist is given of the 320 species and four subspecies of trombiculid mites of the Oriental and Australasian regions described up to the end of 1955, together with a number from papers being published in 1956 and 1957 and consulted by the writer in manuscript or proofs.

Eight new genera, six subgenera, and 175 species from the Oriental and Australasian regions have been described since the compilation of the checklist of world trombiculids by Wharton & Fuller (1952).

The present list gives only the documentation and records necessary to bring the appropriate part of Wharton & Fuller's publication up to date. Cross-references are given to the monograph by Womersley (1952) and its appendix by Womersley & Audy (1957), as well as to the checklists of Gunther (1952) and Radford (1954).

The taxonomic arrangement has been revised in accordance with recent publications. Four new combinations of species of Neotrombicula are recorded.

A supplementary Faunal List is presented, confined to records which now require to be added to the Faunal List of Wharton & Fuller.

In a previous paper (Sinha, 1954), dealing with a collection of larval trombiculids from Manipur, India, four new species, a new subgenus (Plumosicola), and a new genus (Mehracula) were described. The larvae concerned had been mounted in batches, each slide containing considerable numbers. At the request of Dr J. R. Audy, Institute for Medical Research, Kuala Lumpur, the type material was lent to him in 1956 through the kind co-operation of Dr A. P. Kapur, in charge of the Entomology Section, Zoological Survey of India, Calcutta, in whose care the types had been deposited, and who gave permission for the specimens to be remounted individually in PVA-mountant.