In working over nzaterial received for identification from S. C. Bruner and G. N. Wolcott, the following new species were found.

In 1928 the writer described in The Canadian Entomologist, volume LX pages 148 to 151, two species of fleas from Colorado under the names Ceratophylius peromysci and Ceratophyllus citelli. Recent studies have shown that both of these names are synonyms.

In his “Monographie des Guêpes,” published in 1904-05, R. du Buysson describes a new form under the name of Vespa rufa, var. intermedia. His description was based on material in the Paris and British Museums and the localities given are Lake Hanka in Manchuria and Hudson's Bay. I am not aware of any subsequent records in North America.

Runs in my key to Psallus (Hemiptera of Conn., 1923, p. 462) to the couplet with morrisoni Kngt. and parshleyi Kngt., but differs from both in having the second antennal segment yellow except at base.

Eurycaenis. Three male adults of this genus were taken swarming at the edge of a small lake at Daventry, Ont. early in the morning of September 5, 1929. These specimens have the characters set forth by Ulmer in his key to the genera of mayflies (Stettiner Entomologische Zeitung. 81. 1920). namely “Prosternum very broad, twice as broad as long, so that the coxae of the forelegs are widely separated: second antennal segment three times as long as the first segment.” In Caenis the second antennal segment is less than three times the length of the first segment and the prosternum is longer than wide.

If the species bearing this name in the LeConte ccllection is correctly determined, which I see little reason to doubt, its placement as synonymous with nigrinus Dej. by Horn is surely an error. There are in my collection six examples of this species from Massachusetts and Eastern Canada, and I have seen numerous other examples in the Blanchard and Frost collections, all of which differ very definitely from nigrinus in several particulars.

The following survey is based on collections made in Iowa from March, 1929 to February, 1930. It isnot all-inclusive, as intensive collecting was carried on in only a very small area in central Iowa, in the vicinity of Ames. It is hoped however, that the list will be of value in extending the limits of distribution of several species.

For the material here reported upon I am indebted to Dr. L. H. Dunn, of the Gorgas Memorial Laboratory, and Prof. C. H. Vorhies, of the University of Arizona.

During the summers of 1928 and 1929 a study was made of the mayfly fauna of several streams and lakes in Ontario, particular attention being given to associating the nymphal stages with the adults by rearing them in cages set in the stseams. In the course of the work the nymphs of twelve species, hitherto unknown in this stage, were found. These are described below. Three new species were taken and are also described.

Male: Length 2.6-3 mm. Head, thorax, abdomen, legs and feet thickly white pruinose, but the ground color showing through; face moderately wide, wholly pollinose, this pollen yellow in the middle, reaching the orbits at the suture, sides of upper part narrowly, below the suture widely white pollinose, sonsetimes the yellow pollen covers most of upper part and extends onto the inner part of the palpi; palpi with snow white pollen, each nearly as large as upper part of face; antennae wholly yellow, small, arista whitish; orbital cilia white, rather long on the sides; occiput, front, thorax and abdomen reddish coppery, posterior margins of abdominal segments sometimes green ; bristles of thorax small, black; hairs of ahdomen very short, white; pleura and coxae black with ground color nearly concealed with white pollen, tips of coxae yellow; hypopygium small, with a long, straight, black appendage extending forward under the abdomen and small yellowish appendages inside of this long one; femora, tibiae and tarsi pale yellow, last two joints of all tarsi blackish; the minute hairs on all femora and tibiae white, the small bristles on tibiae black; fore tibiae with a row of long white hairs on upper surface, which are as long as diameter of tibiae and extend to fourth tarsal joint, becoming shorter towards the end; apical joint of middle tarsi very slightly widened; pulvilli not enlarged ; joints of fore tarsi as 20-8-6-5-7 ; of middle ones as 32-14-9-6-6; joints of posterior pair as 25-19-11-6-7.

The material upon which this list is based has accumulated since 1900 in the collection of the Montana Experiment Station, and has been collected by workers too numerous to list. However, the basic collection was made by R. A. Cooley at Butte in 1900, and all of the species captured there in two or three nights have not yet been recaptured.

The hypothetical ancestor of the Aphididae was probably a large generalized form, always winged, both sexes occurring in each generation, and with only a few generations each year. Migration would be lacking, and the development of the aphid ancestor would probably be tied up with one of the primitive types of plants occurring in that early period.

At the session of the forest-entomological section of the International Congress of Forest Experiment Stations held at Stockholm in July 1929, Dr. P. Spessivtseff, Experimentalfaltet, Sweden, proposed the forming of an International Society of Ipidologists.

Selandria Leach and Coryna Lep. include the nearctic sawflies of the subfamily Selandriinae in which the costal vein is strongly swollen at its apex. They are of a short and robust form. Enslin (1913) considers Coryna as a subgenus of Selandria, whereas Rohwer (1928) considers the two as distinct. The characters given in the table for the separation of the two genera seem to be sufficient for considering Coryna a good genus.

The common snowy tree cricket (Occanthus niveus) of North America has made a prominent name for itself in American scientific literature. In fact none of our crickets have been so much discussed as this interesting pearly winged insect. There is something in its solemn, rhythmic, time-marking chirping that commands attention, so that all become impressed with its rhythmic music.

It was my privilege to spend the summer of 1929 collecting insects on the north shore of the Gulf oi the St. Lawrence. This insect survey extended from Trinity Bay in the west to Bradore Bay in the Straits of Belle Isle. Particular attention was given to Coleoptera. Except where otherwise stated, the author is responsible for the determinations in the following list.

Studies by Eaton (1884), Dodds (1923) and Needham (1905, 1927) have contributed much to our knowledge of the nymphal forms of Ephemerella occurring in Western North America. Needham's recent paper on “The Rocky Mountain species of the Mayfly genus Ephemerella” contains a valuable discussion of the nymphs of that region and is the first attempt to treat of the species in a comparative manner.

This genus has been considered synonymous with Ludius Esch. but seems distinct by the following characters: form usually robust and strongly convex; front moderately convex, not margined; prothorax wider than long; elytrai striae moderately impressed at base, very feeble or obsolete elsewhere; prosternal lobe rather short; the prosternal process in lateral aspect very strongly arcuate between the coxae and with the apical portion strongly oblique; the prosternal sutures almost straight; coxal plates narrow, more or less narrowed externally; tarsi filiform, the claws simple. Type Limonius estriatus Lec.