An advanced-structure species in the subgenus Garnhamphysalis, Haemaphysalis quadriaculeata Kolonin 1992, was recently discovered in Mengla county, Yunnan province in China. The male material showed a medium-sized tick with campanulate palpi, dental formula 5|5 and capitular, coxal and trochantal spurs, which assign it to the subgenus Garnhamphysalis. However, the presence of sparse conscutal punctations, shallow and short lateral grooves, progressively smaller trochanters and short pulvilli, distinguishes it from Haemaphysalis(G.) sinensis Zhang 1981 and other valid Garnhamphysalis species from China. This finding expands the Chinese Haemaphysalis fauna to 47 species. A key to valid species in the subgenus Garnhamphysalis is presented based on specimens from China and the literature.