May 27 5 mi. N Tehuacén, 1676 m. definite Certainly the qu or cho call shows a relationship to brunneicapillus. This is the only species which has a call of this type - hemilis or rufinucha never give any thing like it. It is so similar to that of brunneicapillus that at first I thought sure the lug coctus wen was here instead of jocunos. However, I don't believe that brunneicapillus gives the che- che-che call when pairs meet and further I am almost certain that the social set-up in that species is one of pairs not groups. This latter type call + general behavior = posturing when 2 lizards meet, etc. seem to indicate a relation to the rufinucha group. There is no drilling of separate songs as in rufinucha - and in fact there appears to be only the two types of calls. Rufinucha has, however, a che-che-che nasal type call which is given by single lizards or by a pair, especially when slightly disturbed or is response to my speeekking. I remember when I once shot one of a pair of rufinucha the other gave a nasal, excited che-che-che, which as I recall is very similar to the call of jocunos. Posturing is much more then in the rufinucha group but it is similar - i.e. wings hinging, tail fanned. I have seen at only given terms. Associated birds: Pipilo fuscus - abundant; Toxotama curvirostra - fairly common; house finch - common in lug trees; Thryomane belluski - two seen on hillside in what seemed to be same situation as C. jocunos.