Marshall, 1942 Empidonax flavescens Los Escosiles March 21 2137 - 2139 (2137 & 2139 apparently a pair) taken in cloud forest trees along ridge back camp. ? imm. but apparently getting ready to breed- seen paired. Not at all like E. difficilis in note or habitat - except the same common note: "seep" ~ to latter. But also gives very penetrating "wheeee" very high & sharp - distinctive. Heard one give a few little note of song piddl-se, twit. heard rarely. Forage very high in light-green, sprawling cloud forest trees - 2 every 50 yards - very common. Rarely come low. Not along stream in regular woods. Many have been shot at on 2nd growth on hill se camp. Some come low. Very wary & hard to get - 9 so far have been shot at & they always make a darting flight before dying. March 23 2147 ? taken same place as above - came low in dense young oaks. E. hammondii in same tree. March 25 ? 2167 & ? 2171 skel , a pair taken on 2nd growth cloud forest hill where foraging low. March 26 ? 2189 taken from low brush in semi-cleared open cloud forest. Common here. These are active very late in evening - when their call sounds like the chip of a bat - saw one silouetted in cloud forest oak when almost dark.