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 May, 1912 SOME NORTH-CENTRAL COLORADO BIRD NOTES 101 80. Piranga ludoviciana. lArestern Tanager. For some reason but a single specimen of this species was seen the whole trip, at Elbert. 81. Petrochelidon lunifrons. Cliff Swallow. Observed near Elbert, at River Bend, Cedar Point, Lowland, between Rayruer and Pawnee Buttes, and at the latter place, where, as noted in the introduction, there was a colony having nests in the bluffs along the creek. Seen near Ault, Fort Collins, and west of there to a little beyond Home P.O. Was common at Walden and other places Fig. 40. PORTION OF THE CLIFF SWALLOW COLONY AT PAWNEE BU'IES in the North Park. July 5, when we passed the Higho schoolhouse, near Lake John, we saw a colony having nests under the eaves of the schoolhouse. counted fifty-seven on the west side of the building, and there were many more on the other. When we passed there again July 17. we found the nests had all been destroyed, presumably by some fool who held the ridiculous belief that the birds harbor bedbugs. There wege millions of mosquitos on which the birds were