LLWoit 1963 2 Aimophila cassinii July 8 8mi. NW Lordsburg, Hidalgo Co., New Mexico on 6-5-70 JP4 158 - Secondaries new Postscript. 1st Primary new back new - rump w/shedded feathers. LW #1941 - molt - throat, breast, rump, etc. tail feathers acute. central pair very worn. LW #1942 - little molt on back. rest of back worn LW #1943 - little molt on back, hindneck + lower abdomen. rest of ventrum appears new LW #1944- back + ventrum partly new. tail looks as if molt begins on lower back. LW #1945- litl e back molt. habitat these birds taken from group of 20-30+ singing 8D20 in mesquite grassland along highway. Birds tended to be found where grass covered 50-75% of ground + was 15+ inches tall. also scattered mesquite up to 6-7 feet tall, most 2-3 feet. when pursued birds would drop from high exposed singing perches down into mesquite clump + often to ground. sometimes moved on ground on opposite side of mesquite from my approach, often sang from concealed perches in mesquite clumps. habits Flight songs were being given by all birds seen. During return to perch + during song wings are fluttered rapidly up + down as bird glides in to land. Song again starts just before peak of arc.