There are several controversial questions in the literature pertaining to the life history of the milkweed beetle, Tetraopes tetrophthalmus. I made an attempt to find the solution to some of these questions during the fall of 1939 and spring and summer of 1940. The results of this study are offered herewith. The milkweed hosts of this insect were abundant along railroads near Urbana, and it was largely in such situations that these investigations were carried out.

The drouth in the prairie states and Canadian provinces in the early years of the 1930's had a marked effect upon ants which seems not to have been noted. My notes on this are very brief but are perhaps worth putting on record because of the apparent passing of this phase of a meteorological cycle.

The gilanus group and T. sequax Will. are elements obviously divergent from T. bovinus L., genotype of Tabanus s. str., but which are provisionally retained in the genus s. lat. for reasons stated previously (Philip, 1941). The three following new species (one from northwestern Mexico) are related to the gilanus group.

Two interesting mayflies, one a Lachlania and the other a Campsurus have been sent recently to the author, the former from Saskatchewan and the latter from Manitoba. Both are apparently new species and are described in this paper.