C. nigricaudatus 47 Rancho Ocuilapa, Chiapas, México April 5 this occurrence was unusual. Continued walking westerly towards the other side of the valley. The river winds across the valley & has some standing pools at this season. There is a rather rich growth of green trees & shrubs, with vines, along the river but the land just away from the banks is very dry and has been cleared to form grassy grazing areas for cattle. Wrens fairly common along the stream - Bonfils has collected 10 along the stream and together we shot 2 more - giving a total of 18 for the day, and I judge 1/2 or more of all the wrens in the area! Apparently Ocuilapa is a pocket where there is a considerable area of habitat - enough to support perhaps 20 pairs or more of wrens. We found no chiapenses although I could see nothing wrong with the habitat available along the stream and around the rancho. Actually it is very similar to that around Tonalá where the dig wren is so abundant. On the foothills is a low deciduous forest and I do not believe that wrens occur there. Heard a song -- week or two - a variation of the Pío-wreet { { { Song of nigricaudatus. It was my distinct impression the range of variation in songs heard around Ocuilapa were greater than at Rancho Oronoz,