It’s not a typo of “Angeles”, and it predates evangelist Aimee Semple McPherson’s Angelus Temple by years. Angelus Avenue was laid out in 1903 in Sunset Heights, a small tract north of Reservoir owned by Elza Lee Allen (1863-1923). (The tract’s three other avenues – Fawn, Elk, and Elza – are now part of Occidental Blvd., Silver Lake Blvd., and Westerly Terrace, respectively.) The Angelus is an old Catholic devotion in which three Hail Marys and a short prayer are recited thrice daily, traditionally upon the call of a church bell. I don’t know if E. Lee Allen was Catholic, got inspired by the Hotel Angelus at 4th and Spring, or just thought “Angelus” was a nifty little pun.