Paratrichius species

Ricchiardi, Enrico, Lu, Yuanyuan, Li, Sha & Ming, Bai, 2022, Notes on Paratrichius Janson, 1881 inhabiting Hainan Island, with description of a new species and the definition of two new junior synonyms (Coleoptera: Scarabaeidae, Cetoniinae), Fragmenta entomologica 54 (1), pp. 133-142 : 134-135

Updated Hainan’s Paratrichius species list

Paratrichius elegantulus (Moser, 1902) new record = brevifolius Kobayashi and Fujioka, 2013 new junior synonym

marmoreus (Moser, 1902) new record

= papilionaceus Ma, 1990 new junior synonym

pilosus Ricchiardi & Lu new species rufescens Ma, 1990

Key to Hainan’s Paratrichius

Sex distinction

Protibia with two sharp external teeth at apex and without spur. Profile of abdomen arched upwards ................Males

Protibia widened at apex with respect to that of the male. Apical spur present. Profile of abdomen not arched upward in lateral view. Sometimes, apex of pygidium more-or-less hollowed...........................................Females

Key to species

1. Larger species (length: 15-15.4 mm). Elytron black, decorated with a conspicuous chalky macula at juxtascutellar area continuing in two, transverse, relatively long chalky spots at one third of length and with one conspicuous chalky spot at two thirds ........................... ............................................................... P. marmoreus (Hainan’s specimens)

- Smaller species (length: 11-14 mm). Elytral integuments completely black or completely reddish, or mixed, with disc decorated with six small chalky spots, three at one third, three at two thirds of length............2

- Pygidium black, completely covered with chalky material (males) or with a pale yellow chalky wide band along anterior and first half of lateral margins (females) ................................................................... P. rufescens

2. Pygidium black, with a different chalky material pattern.....................................................................................3

- Metatarsi with short yellow-brown setae at apex of metatarsomeres I-V ............................... P. elegantulus

3. Metatarsi with long, yellow-brown long setae becoming longer from third to fifth metatarsomeres ...................... .................... P. pilosus Ricchiardi & Lu , new species