The comparative resistance to high temperature and various humidities of four species of blow-flies, Calliphora erythrocephala Meig., Lucilia sericata Meig., Sarcophaga falculata Pand. and Phormia groenlandica Zett. is studied. It is shown that Phormia groenlandica is the most resistant species and Calliphora erythrocephala the least resistant species, with Lucilia sericata and Sarcophaga falculata occypying an intermediate position.

This order of resistance is correlated negatively with the order of the seasonal succession of the species.

It is suggested that certain differences in the length of life of males and females subjected to various humidities is brought about by an “ageing” factor.

Through the kindness of H. H. Woken, the veterinary surgeon of the Zoological Garden in Leningrad, we were able to examine the faeces of two species of birds—the grey partridge (Perdix perdix) and the stone partridge (Caccabis chucar). It is very probable that the coccidian found by us is common to both species of birds, but as they were kept in the same cage it was not possible to determine the origin of the faeces examined.

Anguillulina Aptini (Sharga) was described in 1932. Nematodes had previously been recorded in other species of thrips (Uzel, 1895; Russell, 1912), but no descriptions had been published. There is an extensive body of literature dealing with the nematode parasites of other insects (see van Zwaluwenburg, 1928).

The nematode described here was collected by the Wyoming field party of the United States Bureau of Fisheries during the summer of 1934. The Rocky Mountain whitefish, the Eastern Brook trout, and the rainbow trout serve as hosts for the parasite. In several instances pathological changes, particularly of the gonads, were found to accompany its presence.

In July, 1934, I found a trichomonad-like organism in water taken from a pond in Lincolnshire. Its morphology, and method of division, and also the cultural conditions under which it will grow, have been described previously (Bishop, 1935). It was named, provisionally, “Trichomonas” keilini. In “T.” keilini, unlike most trichomonads, the undulating membrane is short, the bordering flagellum never becomes free, and there is no basal fibre beneath the undulating membrane. “T.” keilini was never found directly in the pond water but only after it was centrifuged and allowed to stand for 7–21 days.

A list of entomophagous fungi was published by Gray in 1858, and since then a great many more have been recorded. Accounts of those found in the body cavity of scale insects have been given by Schwarz (1924), and by Brues & Glaser (1921). These are apparently symbiotic and allied to Saccharomyces. Several species of Coelomyces have been found in the body cavity of mosquito larvae and described by Keilin (1921, 1927) and Iyengar (1935).

Specimens collected by the Swedish Expedition to the White Nile in 1901 have been identified as Rhadinorhynchus niloticus Meyer, 1932. On the basis of this material, including the first recorded females, the species has been restudied. Points wherein the individuals are unlike the forms included in the family Rhadinorhynchidae are presented in detail. A new genus, Tenuisentis, is proposed with Rhadinorhynchus niloticus as type. This new genus becomes type of a new family, the Tenuisentidae, which is assigned to the order Eoacanthocephala.