The preceding part under this general title was published in 1945 (Can. Ent., 76:217-222). In the present paper I am describing certain species of unusual interest that were collected and sent to me by Messrs. Aitken, Bohart, Degener, Melander and the late Millard C. Vall Duzee, to all of whom I express my sincere thanks and appreciation for this aid. Except where stated to the contrary in the text, the types of the novelties are preserved in my personal collection.

Insect collecting by aircraft (1) has shown that individuals of some species of insects attain heights of four or more kilometers above the earth (6). Upon consideration of the meteorological conditions within this vertical range, it would seem that the normal decrease with height of atmospheric pressure, temperature and humidity would bar flights to altitudes such as those at which specimens have been found. Conversely, certain atmospheric processes might act to carry insects inertly to such altitudes, possibly beyond the supposed limits of insect resistance to the first-named elements.

In the course of investigating the distribution of plague in the western part of the United States, the field units of the U. S. Public Health Service have collected several species of the genera Dactylopsylla and Foxella. Among these collections there are three new species of Dactylopsylla and one new sub-species of Foxella whose characteristics are as follows:

Dactylopsylla neomexicana n. sp.

This species is close to Dactylopsylla bluei (C. Fox).