Oct. 21 El Batel, 5700 ft., Sinaloa. a rock wren. Today Leopold and I each collected a wren, and the two differed distinctly; the locally resident species is [illegible] molt, it? The last three days, after three successive afternoons of rain, have been warmer and drier, although by early afternoon, the clouds began to roll in from the west as they have every day since we have been here. At any rate, the calm weather conditions seem to have led to reduced local activity among birds'. Earlier, after the rains, not only did there appear to be more feeding activity among the local species', but the number of migrants was greater. Few things are in song now — the solitaires, the small = Basileuterus rufifrons yellow-throated red-cap (compsothlypid?) tho and only briefly, painted redstart, and occasionally in the blue mockingbird. According to Alberto Labrador, the rains continue here intermittently into January and February, during which months there may be occasional snow. Then the dry season begins and continues to the end of May. The rainy season, and the breeding period of the local avifauna as well, begins in early June. The rainy season apparently continues through September. That this generalization with respect to breeding season applies to most species is indica- ted by the fact that now, in mid-October,