A genus of Rutelinae, Scarabaeidae
Type species of the genus is Fruhstorferia javanus, known from West Java, Indonesia
There are 6 species which are belong to the genus and can be divided into 3 main groups:
Group F. javana include 4 species, typical with point, slender penis and they distribute in Indo-Malay area
Fruhstorferia javana Kolbe, 1894 (Java) (Do Collection)
Group of black Fruhstorferia, consist of single species F. anthracina Ohaus, 1903. The species with whole body shining black, quite close to group F. javana. They have been found from North Vietnam and Laos, and considered to be distributed also in South China.
The last group contain a large size and single species: F. egreria Pouilaude, 1915. This is maybe the biggest species of horn rutelinae and it has been known with very few records since be published with a single male specimen that was collected from South Vietnam. Indeed, there are only two records of the species, first by the author and the type now is being in the Paris Museum of Nature History; the second record by a Japanese with another male collected from Kon Tum Province, South Vietnam. Base on the structure of the penis of the species, maybe this species maybe very close to Pukupuku or something that not belong to Fruhstorferia. Both taxonomy and biology/ecology of the species are unknown and to be a big questions are why it to be so rare, what is their host plan as well as its behavior. In case of it closes or belong Pukupuku, it is possible that the mature of the species be emerging in very early time of the season, and difference from almost of other beetles. If this be true, it will be same to another member of Pukupuku, P. katsurai (Muramoto, 2002) recorded from North Vietnam and South China recently, the mature found in very early of the season (December to February). The other member of Pukupuku, P. curta, the co-type was noted that collecting time is about December from Laos. The mature of the genus appear in very early season, difference from all remain members of the group. Maybe the same thing happen with F. egregia!
Photos of holotype of F. egreria can be seen in the link here