Eupatorus endoi Nagai, 1999

The species was described by Shinji Nagai in 1999 based on specimens that collected from South Vietnam. Not same to other species of the genus, the species is small size and about the size of species of Xylotrupes genus.
The male of the species distinguished with 2 horns on the pronotum, the horn of the head vary with bifid or point apex.
The type locality of the species is Lam Dong Province, South Center of Vietnam.

Male of Eupatorus endoi in difference point of views

Trichogomphus robustus Arrow, 1930

A medium small Dynastid beetle, they found in high mountain forest of North Vietnam, Laos and South China.

Female litter smaller than male, they are black or somehow reddish insects. Flying season about May - July.

Trichogomphus robustus Arrow, 1930; male

Chalcosoma causasus (Fabricius, 1801) from South Center of Vietnam

Chalcosoma causasus is one of large size species of Dynastinae (Scarabaeidae family) beetles that found from Vietnam. The species is closed to Chalcosoma atlas and very similar in shape but there is a small spine (horn) on the middle large horn from the head of beelte.

Same to other beetles of Dynastinae, Chalcosoma causasus has also large form and small form in males, they have been found from Dak Nong Province, South Center of Vietnam. The species is more rarer than its related species Chalcosoma atlas.

Large form of male of Chalcosoma causasus, in dorsal view (above) and oblique view (below)

Large form of male of Chalcosoma causasus, view front view.

Small form of male of Chalcosoma causasus, in dorsal view (above) and oblique view (below)

Checklist of Dynastinae, Scarabaeidae of Vietnam

1. Alissonotum cribratellum (Fairmaire, 1893)
2. Alissonotum impressicolle Arrow, 1908
3. Clyster rectus Dechambre, 2002
4. Clyster scaurus Prell, 1911
5. Chalcosoma atlas ssp. mantetsu Nagai, 2005
6. Chalcosoma causasus (Fabricius, 1801)
7. Dichodontus intermedius Dechambre, 1981
8. Eophileurus confinis Prell, 1913
9. Eophileurus heyrovskyi Kral & Strnad, 1992
10. Eophileurus quadrigeminatus Arrow, 1914
11. Eophileurus ryuheii Muramoto, 2011
12. Eupatorus endoi Nagai, 1999
13. Eupatorus gracillicornis Arrow, 1908
14. Eupatorus hardwickei (Hope, 1831)
15. Heteronychus curtulus Fairmaire, 1887
16. Heteronychus puncticollis Fairmaire, 1893 (nec Jack. 1923)
17. Heteronychus punctolineatus Fairmaire, 1893
18. Microryctes apicalis Arrow, 1908
19. Microryctes katagirii Yamaya, 2000 (ZR-2001)
20. Microryctes monodon (Fairmaire, 1893)
21. Peltonotus favonius Jameson & Wada, 2009
22. Peltonotus karubei Muramoto, 2000
23. Peltonotus nasutus Arrow, 1910
24. Phyllognathus dionysius (Fabricius, 1792)
25. Trichogomphus mongol Arrow, 1908
26. Trichogomphus robustus Arrow, 1930
27. Xylotrupes socrates tonkinensis Minck, 1920