J.R. Myers 1979 Journal Linear grid, Arroyo Chico, Estancia Medland, 35 Km S. of Jujancho by road, Ptdo de Malaringa, Pucia de Bremer Aires, Argentina. the morning was remarkable for the first strong S wind which piled water up against to the northern ends of most (1-2) keep of the Arroyo. The effect was particularly marked behind the linear grid at the curve, 19:15, where water was shifted around to such an extent that there was no net downstream current. In fact the channel was bailed of all (but a surface film at the s point). It was along here that a flood of 25" WR and Microptera had congregated, including a recent bandee, Rp Lg B, handed in [22,17] on 17 Oct. Two new returned, also (but not in this flock): Rply and RyLyo. (22,15) Estancia Medland, Ptdo de Malaringa, Pucia de Bremer Aires, Argentina. 1700 drove to the roosting area by the second windmill in (23,15) [see journal 9 October], and immediately placed mist nets spaced evenly along the length of the swamp and perpendicular to its long axis. We had some trouble putting the nets up because of a hard-strong south westerly wind which diminished only after ~ 1845. (Cloud cover during the evening - 0; temp dropped to < 8°C. At ~ 1945 I began walking the area, in an attempt to sneak the now roosting birds into the nets. However I found that even at that time, 45 min after sunset, the birds were able to avoid the nets if they were flying SW (i.e. toward a glowing horizon). And then they did, almost without exception. I therefore waited another 30 minutes and began pacing again, this time w/ ears: I walked through the middle of the swamp and then walked along the border ~ 15 m from edge. As found that the birds, when they flew, still took off in the SW direction. However, I had to approach them quite closely - even with all the stalking - in order to get the fasciollis or melanochroa to fly at all. When their tendency to remain became apparent, I began using the headlamp (a weak 9 volt affair) to attract speak them. Even with the light they were unwilling to leave. In fact, I was able to catch a fasciola: by spotlighting with the headlamp and thus saving my shot upon it. (We Rply B - subhanding school). Anyway, despite a large number of birds in the roost, we caught only that one w/ 2 golden plovers and one peotral. Returned to camp at 2230. The lesson of the evening is to wait till birds come in, locate their precise roosting spot, and then, afterwards, walk them into place them between the birds and light. Then, after a brief wait, try to speak them into the nets.