Genus Plaesius Erichson, 1834


Plaesius Erichson, 1834: 101 [type species: Plaesius (Plaesius) javanus Erichson, 1834: 102].


Notes (Ohara & Mazur, 2000).

Plaesius comprises large histerids which are similar to Placodes and Oxysternus in having two large dents and many spines on outer margin of protibia. It includes 15 species (Mazur, 1997) and is divides into two subgenera, Plaesius and Hyposolenus. The species belonging here can be separated from other members of the tribe Platysomatini by the following characteristics: 1) large body size, 2) the presence of two large denticles on outer margin of protibia, and 3) the absence of a large tooth at apical angle of the meso- and metatibiae. According to Bickhardt (1917), the subgenera are distinguished by following key:

1 (2) Marginal mesosternal stria complete. .................................................. Hyposolenus

2 (1) Marginal mesosternal stria broadly interrupted at middle. ......................... Plaesius

Distribution. Southeast Asia.


Subgenus Plaesius Erichson, 1834

Notes (Ohara & Mazur, 2000). The subgenus Plaesius is represented by 11 species. The marginal stria of the mesosternum is usually broadly interrupted medially.

Distribution. Southeast Asia (Oriental region: Thailand, Laos, Nicobar Is., Malacca, Java, Molucca, Aru Is., New Britain, New Guinea, Solomon Is.; introduced to Fiji, Haiti, Maurice Is., Trinidad and Jamaica).




Subgenus Hyposolenus Lewis, 1907

Hyposolenus Lewis, 1907: 97 [type species: Plaesius (Hyposolenus) laevigatus Marseul, 1853: 228].


Notes (Ohara & Mazur, 2000). Hyposolenus contains 4 species. The marginal stria of the mesosternum is complete, sometimes shortly interrupted medially but not so broadly as in Plaesius.

Distribution. Sikkim, Bengal, Assam, Burma, Tenasserim, Vietnam, Java, Sumatra, Borneo, Philippines.



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