Eighteen species of the Pacific leafhopper genus Hecaloidella Osborn, 1934 are described and illustrated and a key provided for their separation. The previously described species, H. nitida Osborn (type species) and H. brunnifacialis Shang Zhang, and the following sixteen new species are treated: H. brunifasciata Zhang Webb, H. bimaculata Zhang Webb, H. borneoensis Zhang Webb, H. brevis Zhang Webb, H. brevipenis Zhang Webb, H. brevispina Zhang Webb, H. caudospina Zhang Webb, H. knighti Zhang Webb, H. longipenis Zhang Webb, H. nudapenis Zhang Webb, H. pacifica Zhang Webb, H. quadripicta Zhang Webb, H. quadrispina Zhang Webb, H. sandakanensis Zhang Webb, H. singaporensis Zhang Webb and H. spinosa Zhang Webb spp. nov..
Keywords: Hemiptera, Auchenorrhyncha, Selenocephalina, taxonomy, morphology.