6 mi. N of Pachuca, 9600 ft., Hidalgo, Mex. July 3, 1946. Scrub, or wherever the undercover under trees was fairly dense. Plagioptera supralissa. Armooflida inferocana - several seen in the pines bordering an extensive patch of Baccharis scrub at about 9100 ft. Colibri thalassinus - seen sparingly along the scrub patches with Hylocharis. July 4, 1946 Came into Mexico City, but were unable to do much because the Embassy and several other places were closed because of the holiday. Spent night at Azteca Courts on northern outskirts of city. July 5, 1946 Shopped, reorganized our equipment, etc., and stayed at Azteca Courts. July 6, 1946 Left Mexico, D.F. at about 9 a.m. on Camino Nacional No. 2, headed for Las Vegas. Most of the pertinent information concerning terrain traversed is in species account for Lepido fauna, this date. The only salient geographical feature not mentioned therein is the great, grass-covered plain, flat and wind-swept, extending for about 12 miles, which starts about 20 mi. N.E. of the junction of the Mexico, D.F. Orizaba and Mexico, D.F.- Jalapa roads. Although the complete lack of cover other than grass and corn make