atricriostatus Jan 31. 11 mi. NW Sourdon, 700 ft., Atascosa Co, Texas notes vet vet vet. Bird flew back from N of road and chased other again; latter retreated 20 feet to S but followed aggressor back to roadside. Mate of aggressor remained N of road always and called vet vet or trip rather steadily. On two occasions, S bird flew to N edge of road following N bird after a chase only to be repulsed. S bird always pursued aggressor to edge of road (S edge) but could not seem to hold that line – seemed definitely not dominant in our town. On one occasion bird being pursued (S on ground) fluttered wings. Only note given was vet vet vet which seemed to affect N 8 as a challenge for whenever S bird backed this out, the road was crossed by N 8 and another pursuit ensued. I watched one bird foraging – may have been mate of S 8 although no evidence of such beak during fights. Boundary wrangle continued silently but rather steadily until 9:10 – intermittently until 9:25 when I moved W. Call vet-it vet-it vet-it along fence N of gate answered by N bird to E. I worked along to W or N side of road led on by call vet vet of retreating Lawrence. At 9:37 I located pair in brush N of windmill. Song tär-tär-tär of S in persimmon – mate in leafy shrub.