Erickson 1934 Catherpes mexicanus concolor hit it; it reappeared immediately a few feet from this point, then moved rapidly downslope; mate following from exchange of call notes. Relocated downslope in next thick rock patch; one sang, collected, other stood nearby, called; also taken. Worked north on westfacing slope of lava hill for 300 yds or more without locating another pair; counter hill similar large slabs of lava rock interspersed with areas of less rock and granite of hill showing; these areas with palo verde bushes and some creosote and a few other plants. A second pair located low on slope 350 yds. from last ones, were aware of observer and moved more rapidly and greater distances than others observed: flew 15-20 yds several times, then would work more slowly in rocks, finally calling to mate; 20yds one collected; other some distance at time; became silent and remained so for 10-15 min.; then heard calls over small ridge; followed and secured; (no. 278) proved to be female of pair. Of first pair shot both were badly damaged, in [illegible] one taken while (no. 280) (no. 279) singing no gorads could be made out. In other ovary badly damaged, but determinably female. Another male heard singing on hill west of one on which second pair secured. New River Valley 30 mi. N of Phoenix, 1650 ft, Maricopa Co., Ariz. Feb. 13, 1934. One heard in song on rocky hill SE of camp.