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Onitis phartopus
"Total body length 18.0–26.0 cm (0.71–1.02 in). Body shape subquadrate posteriorly; may be caked in dried dung. Color dull black. Clypeus rounded to weakly sinuate. Frons with weak, central tubercle. Front tibia of male elongate, curving ventrally and inward at apex; female tibia less elongate and less curved than male; tarsi lacking in both sexes. Middle leg with tibia of male abruptly expanded to a trapezoidal apex, female tibia less clearly trapezoidal. Hind trochanter with spine on posterior margin in male (lacking in female). Hind femur lacking spine-like process on posterior margin in both sexes." http://idtools.org/id/beetles/scarab/fac...
indoor at MSC Institute of Technology, San Gabriel, San Pablo City, Philippines - a semi-agricultural area
Scarabaeidae, Scarabaeinae
Decided on O. phartopus, because the other Philipp. species, falcatus, seems to have no trace of elytral striation.