Subject: What is this?
Geographic location of the bug: El Sereno, Los Angeles
Time: 06:30 PM EDT
Your letter to the bugman: This is hanging from my citrus tree. What is it?
How you want your letter signed: Emily
These are egg sacs of a Bolas Spider, Mastophora cornigera, a harmless Orbweaver. Here is a BugGuide image for comparison. BugGuide also contains this bit of fascinating information: “When egg sacs hatch they release immature females and *mature* males! Presumably an adaptation to avoid inbreeding. Males are short-lived and much smaller (obviously) than females.” The eggs will hatch in the spring.