Chrysapace Crawley, 1924

Yamada, Aiki, Lin, Chung-Chi & Eguchi, Katsuyuki, 2019, Taxonomic notes on the rare ant genus Chrysapace with description of a new species from Brunei (Hymenoptera: Formicidae: Dorylinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 59 (2), pp. 467-480 : 469

Genus Chrysapace Crawley, 1924

Chrysapace Crawley, 1924: 380 . Typespecies: Chrysapace jacobsoni Crawley, 1924 (junior secondary homonym in Cerapachys , replaced by Cerapachys crawleyi W. M. Wheeler, 1924 ), by monotypy.

Diagnosis. This genus can be recognized by a combination of the following characteristics of the worker caste: i) prominent costate sculpture on most of body surface, ii) large eyes, iii) exposed antennal sockets, iv) two spurs on mid and hind tibiae, and v) pretarsal claws with a tooth ( BOROWIEC 2016).

Key to Chrysapace species based onthe worker caste. The key to valid species is provided below. Known distribution is shown in the parentheses after species name. Our knowledge on C. jacobsoni is based on its original description ( CRAWLEY 1924), WHEELER (1924), and BROWN (1975).

1 Abdominal tergite IV–VI longitudinally costate (except for anterior marginal areas); dorsum of mesosoma transversely arched in most areas. ................................... .......................................... C. jacobsoni Crawley, 1924 (Sumatra, Borneo, Philippines)

– Abdominal tergite IV–VI lacks any costation; dorsum of mesosoma longitudinally costate. ............................ 2

2 Abdominal tergite III with costae which are transversely arched around center of posterior margin in dorsal view ( Fig. 5 ). ....................... C. merimbunensis sp. nov. ( Brunei)

– Abdominal tergite III longitudinally costate. ............. 3

3 Costae on vertex at most weakly distorted ( Fig. 41 ); eye and ocelli relatively small (EI + OI ≦ 25). ...................... .................................................. C. sauteri ( Forel, 1913) (Taiwan)

– Costae on vertex strongly and coarsely distorted ( Figs 42–43 ); eye and ocelli relatively large (EI + OI ≧ 29). ........................ C. costatus ( Bharti & Wachkoo, 2013) (northern India, Yunnan, Guangxi)

Figures

Figs 1–8.Chrysapace merimbunensis Yamada & Eguchi sp. nov., worker, holotype (except for Fig. 6 which is based on a paratype). 1 – head in full-face view; 2 –body in lateral view; 3 – head and mesosoma in dorsal view; 4 – left mandible in dorsal view; 5 – metasoma in dorsal view; 6 –pretergite and cinctus of abdominal segment IV in dorsal view; 7 – pygidium in dorsal view; 8 – hypopygium in ventral view.

Figs 41–43. Difference of worker’s head sculpture between Chrysapace sauteri (Forel, 1913) and Chrysapace costatus (Bharti & Wachkoo, 2013). 41 – C. sauteri nontype from Taiwan, colony: Eg12v17-1214; 42 – C. costatus nontype from Yunnan; 43 – C. costatus holotype from India.