Rephilo fusca 40. Davis 946 Sahuayo, Michoacan, Mex. to Guadalajara, Jalisco, Mex. Aug. 2, 1946 fusca noted: 2 2 mi. W of the jalisco line. P. fus- cus noted. (San Luis) Soyotlan, 5200ft. P. fus- cus noted. 12 mi. W of (S. Luis) Soyotlan, P. fus- cus noted. 12 1/2 mi. S of Guadalajara, 4P. fus- cus noted. To sum up, no barrier has been noted between Sahuayo, Michoacan, Mex. and Guadalajara, Jalisco, Mex. Certainly Lake Cha- palais no barrier, as the tourists follow the lakeshore and the hills above the lake shore. There is an altitudinal decrease, rather even in nature, from Sahuayo, at 9500 ft, to Guadalajara, at 5200ft. Spread over this altitudinal "cline" is an almost contin- uous population of birds. It is possible that certain characters are subjected to a clineal effect, concomitant with the altitu- dinal cline and its associated vegetational & meteorological changes, but it is hard to see where any sharp breaks in the cline occur. It is possible that Van Rossem named a population representing one end of the cline at level rosos. The naming of such a popu- lation does not represent the true picture. Thus far, the birds seem to show larger size and more rusty in the plumage, rather than smaller size & overall darker coloration.