Usu. translates Hb. ארבהʾrbh [H697].
arbeh (and therefore ἀκρίς) refers generically to locusts, but also can refer to a specific cycle of the locust, or to a specific type of locust.
Per Jl. 1:4 and Jl. 2:25, an arbeh is thought to be one for four cycles of the locust, the resident adult stage (yeleq, hasil, and gazam are the other stages).
Per Lv. 11:22, an arbeh is thought to be one of four specific types of locust (of which <em<hagab, hargol, and sol'am are the other types)
locust (n.) [Generally, locust; also specifically, arbeh-locust. Usu. translates Hb. ארבהʾrbh [H697]. Per Jl. 1:4 and Jl. 2:25, an arbeh is thought to be one for four cycles of the locust, the resident
yeleq-locust (n.) [Usu. translates Hb. ילקylq [H3128]. Per Jl. 1:4 and Jl. 2:25, a yeleq is thought to be one of four cycles of the locust, the wingless hopper stage]
hasil-locust (n.) [Usu. translates Hb. חסילḥsyl [H2625]. Per Jl. 1:4 and Jl. 2:25, a hasil is thought to be one of four cycles of the locust, the crawling nymph stage]
gazam-locust (n.) [Translates Hb. גזםgzm [H1501]. Per Jl. 1:4 and Jl. 2:25, a gazam is thought to be one of four cycles of the locust, the swarming adult stage]