Key to Ceroplastes species based on adult males

1 Penial sheath with fleshy setae...................................................................................................................2

- Penial sheath without fleshy setae ...................................................................................... Waxiella species

2 Penial sheath apex rounded; fleshy setae absent on basal portion of penial sheath; glandular pouch absent .................................................................................................................................................... C.ceriferus

- Penial sheath apex pointed; fleshy setae present on basal portion of penial sheath; glandular pouches present or absent..........................................................................................................................................3

3 Penial sheath long (ratio of total body length to penial sheath length 1: 0.24); membranous area of scutum with 10–14 (12) fs and 6–10 (8) hs scutal setae; glandular pouches absent ............................ C. japonicus

- Penial sheath shorter (ratio of total body length to penial sheath length 1:0.15); membranous area of scutum with about 23 (fs+hs) scutal setae; glandular pouches present............................ C. cirripediformis