Key to the Indian species of Maacoccus Tao, Wong & Chang

Character states of M. adersi are based on Łagowska and Hodgson (2019). All the remaining species were studied using slide-mounted Indian specimens.

1(0) Each stigmatic cleft with more than 3 stigmatic setae. Dorsal tubular ducts present or absent......................... 2

- Each stigmatic cleft with 3 stigmatic setae. Dorsal tubular ducts present.......................................... 3

2(1) Antenna 6-segmented. Dorsal tubular ducts present in a sparse line near margin.................. M. adersi (Newstead)

- Antenna 6- or 8-segmented. Dorsal tubular ducts absent........................................ M. piperis (Green)

3(1) Venter of abdominal segment VI with a band of 18‒26 medial and mediolateral tubular ducts. Anal plate with 1 apical seta, 2 inner margin setae and 1 outer margin seta (total 4 pairs). Live adult female with conspicuous colourless median longitudinal and 2 transverse carinae forming shape of gallows......................................... M. bicruciatus (Green)

- Venter of abdominal segment VI with a band of 14‒16 medial and mediolateral tubular ducts. Anal plate with 1 apical seta, 2 inner margin setae and 3 setae on dorsal surface of anal plate (total 6 pairs). Live adult female dark ochreous in medial area, lighter towards margin, without any dorsal markings............................................ M. watti (Green)