EL Kalstein 1956 Bufo boreas April 21 12.1°C. Pair removed to bottle. Now I discover & dead and bloated which account for her great girth. Later I removed the ovaries provided another living microcephalus & but the larvae was not inclined to close her. Both left overnight in a gallon jug. The ecological separation of larvae and micro- cephalus must be on a temporal basis; certainly the species are utilizing the same breeding water. However, I found 3 pairs of micro- cephalus in impoundment but not a single adult & boreas of the nine I collected. Both Bufo utilize similar breeding water – shallow, slower moving river margin or puddles and ponds on an scraped-over middle river area (X on sketch). cotton woods [illegible] main flow 75 yards Earten leaves 6" high Bullfrogs tend to favor sedge at stream margin but some found alongside Bufo in shallow water. Hyla chrys is nervous but males not seen since they call from flowing or standing water within sedge cover. No eggs or larvae seen tonight.