Dictionary
spot'ted alfal'fa a"phid
a pale yellowish aphid,
Therioaphis maculata, of the southern U.S., esp. west of the Mississippi River, that is marked with black spots and has fine spines on its back: a pest mainly of alfalfa and some other legumes, as clover.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.