A new species and two new records of Indomasonaphis Verma, 1971 (Hemiptera, Aphididae) from China

<i>Indomasonaphis</i> Verma, 1971 is a small genus primarily distributed in the southern Himalayan region. The genus is morphologically characterized by a concave frons; sparse, long, thick, and blunt or capitate dorsal setae; long clavate siphunculi; spinulose tarsi; and conspicuously hairy cauda. Based on the examination of Chinese specimens, the genus <i>Indomasonaphis</i> is recorded for the first time in China. A new species, <i>Indomasonaphis polygoni</i> Qiao & Xu, <b>sp. nov.</b> on <i>Polygonum</i> sp. is described here. Additionally, <i>Indomasonaphis anaphalidis</i> (Basu, 1964) and <i>Indomasonaphis rumicis</i> (Chakrabarti & Raychaudhuri, 1975) are newly recorded here from China. DNA barcode sequences of two species in the genus, <i>I. anaphalidis</i> (Basu) and <i>I. polygoni</i> Qiao & Xu, <b>sp. nov.</b> were obtained for the first time. Keys to the Chinese species in this genus have been constructed.