Maechidius

 Maechidius sp., from Morwell National Park Online.

Belongs within: Melolonthinae.

Maechidius is an Australasian genus of chafers, at least some of which live in association with termite nests. The antennae may be withdrawn into pockets at the front of the prothorax, formed by blade-like extensions of the hypomeral margin (Britton 1957).

Characters (from Britton 1957): Two teeth on outer edge of anterior tibia, the basal tooth usually on distal half of tibia, obtuse, not acute and closely applied to the edge; anterior edge of pronotal hypomera produced forwards to form a blade-like free edge enclosing a pocket into which antenna can be withdrawn; edge obtusely angulate when viewed from side; claws with or without pulvilli; antennae seven-, eight- or nine-segmented including a three-segmented club; disc of pronotum and elytra often with characteristic annular setiferous punctures; body form depressed; abdomen with a strong longitudinal ridge on each side; tergite and sternite of propygidium at least partly fused; colour reddish brown to black.

<==Maechidius Macleay 1819 [incl. Geobatus Boisduval 1835]HW92
    |  i. s.: M. bidentulus Fairm. 1877M86
    |         M. tridentatus Britton 1963HW92
    |--M. hackeri Lea 1919B57, HW92
    |--M. pilosus Blackburn 1891B57, HW92
    |--M. variolosus Macleay 1871B57, HW92
    |--M. spurius groupB57
    |    |--*M. spurius (Kirby 1818)HW92 (see below for synonymy)
    |    |--M. metellus Britton 1957B57, HW92
    |    |--M. proximus Britton 1957B57, HW92
    |    `--M. wilsoni Britton 1957B57, HW92
    |--M. antennalis groupB57
    |    |--M. antennalis Blackburn 1898HW92
    |    `--M. tumidifrons Britton 1957B57, HW92
    |--M. ater groupB57
    |    |--M. ater Waterhouse 1875HW92
    |    |--M. pellus Britton 1957B57, HW92
    |    `--M. savagei Lea 1917B57, HW92
    |--M. capitalis groupB57
    |    |--M. capitalis Blackburn 1907HW92
    |    |--M. chadwicki Britton 1957B57, HW92
    |    |--M. occidentalis Britton 1957B57, HW92
    |    `--M. tibialis Blackburn 1892B57, HW92
    |--M. caviceps groupB57
    |    |--M. caviceps Blackburn 1888HW92
    |    `--M. crassifrons Britton 1957B57, HW92
    |--M. crenaticollis groupB57
    |    |--M. crenaticollis Blackkburn 1888 [incl. M. collaris Blackburn 1898]HW92
    |    `--M. squamipennis Lea 1917B57, HW92
    |--M. fissiceps groupB57
    |    |--M. fissiceps Macleay 1888HW92
    |    |--M. kiwanus Britton 1957B57, HW92
    |    `--M. puncticollis Lea 1924B57, HW92
    |--M. gibbicollis groupB57
    |    |--M. charaxus Britton 1957B57, HW92
    |    `--M. gibbicollis Blackburn 1898HW92
    |--M. hopianus groupB57
    |    |--M. excisus Waterhouse 1875B57, HW92
    |    |--M. hopianus Westwood 1842 [=M. hopeanus (l. c.); incl. M. obscurus Macleay 1871]HW92
    |    `--M. rugosicollis Macleay 1871B57, HW92
    |--M. hoplocephalus groupB57
    |    |--M. conspicuus Lea 1917B57, HW92
    |    |--M. eutermiphilus Lea 1924B57, HW92
    |    |--M. geminus Britton 1957B57, HW92
    |    `--M. hoplocephalus Lea 1917HW92
    |--M. insularis groupB57
    |    |--M. insularis Lea 1917HW92
    |    `--M. stradbrokensis Lea 1919B57, HW92
    |--M. konandus groupB57
    |    |--M. kanallus Britton 1957B57, HW92
    |    |--M. konandus Britton 1957HW92
    |    `--M. kurantus Britton 1957B57, HW92
    |--M. lateripennis groupB57
    |    |--M. amanus Britton 1957B57, HW92
    |    |--M. calabyi Britton 1957B57, HW92
    |    |--M. emarginatus Waterhouse 1875B57, HW92
    |    |--M. lateripennis Lea 1917HW92
    |    |--M. milkappus Britton 1957B57, HW92
    |    |--M. olor Britton 1957B57, HW92
    |    |--M. parandus Britton 1957B57, HW92
    |    `--M. serratus Britton 1957B57, HW92
    |--M. longitarsus groupB57
    |    |--M. latus Waterhouse 1875B57, HW92
    |    `--M. longitarsus Waterhouse 1875HW92
    |--M. major groupB57
    |    |--M. froggatti Macleay 1888B57, HW92
    |    |--M. major Blackburn 1888HW92
    |    `--M. mellianus Westwood 1842B57, HW92 [incl. M. sinuaticeps Blackburn 1889HW92]
    |--M. ordensis groupB57
    |    |--M. caesius Britton 1957B57, HW92
    |    |--M. cavus Britton 1957B57, HW92
    |    |--M. clypealis Blackburn 1894B57, HW92
    |    |--M. coelus Britton 1957B57, HW92
    |    |--M. ordensis Blackburn 1898HW92
    |    `--M. rufus Westwood 1842B57, HW92
    |--M. rugosipes groupB57
    |    |--M. brevis Waterhouse 1875B57, HW92
    |    |--M. modicus Blackburn 1898B57, HW92
    |    |--M. parvulus Macleay 1871B57, HW92 [incl. M. acutangulus Waterhouse 1875HW92]
    |    `--M. rugosipes Blackburn 1888 [incl. M. imitator Blackburn 1898]HW92
    `--M. sordidus groupB57
         |--M. algonus Britton 1957B57, HW92
         |--M. atratus Burmeister 1855B57, HW92
         |--M. corrosus Waterhouse 1875B57, HW92 [incl. M. sculptipennis Lea 1917HW92, M. sexdentatus Waterhouse 1875HW92]
         |--M. davidsoni Britton 1957B57, HW92
         |--M. excisicollis Blackburn 1898B57, HW92
         |--M. macleaynus Westwood 1842B57, HW92 (see below for synonymy)
         |--M. pygidialis Britton 1957B57, HW92
         |--M. raucus Blackburn 1907B57, HW92
         |--M. relictus Blackburn 1907B57, HW92
         `--M. sordidus (Boisduval 1835) [=*Geobatus sordidus; incl. M. raddonianus Westwood 1842, M. raddonanus (l. c.)]HW92

Maechidius macleaynus Westwood 1842B57, HW92 [=M. macleajanus (l. c.)HW92, M. macleayanus (l. c.)HW92; incl. M. multistriatus Blackburn 1898HW92]

*Maechidius spurius (Kirby 1818)HW92 [=Trox spuriusHW92; incl. T. australisB35, Maechidius kirbianus Westwood 1845HW92, M. kirbyanus (l. c.)HW92]

*Type species of generic name indicated

References

[B35] Boisduval, J. B. 1835. Voyage de Découvertes de l’Astrolabe. Exécuté par ordre du Roi, pendant les années 1826–1827–1828–1829, sous le commandement de M. J. Dumont d’Urville. Faune entomologique de l’océan Pacifique, avec l’illustration des insectes nouveaux recueillis pendant le voyage vol. 2. Coléoptères et autres ordres. J. Tastu: Paris.

[B57] Britton, E. B. 1957. A Revision of the Australian Chafers (Coleoptera: Scarabaeidae: Melolonthinae) vol. 1. British Museum (Natural History): London.

[HW92] Houston, W. W. K., & T. A. Weir. 1992. Melolonthinae. In: Houston, W. W. K. (ed.) Zoological Catalogue of Australia vol. 9. Coleoptera: Scarabaeoidea pp. 174–358. AGPS Press: Canberra.

[M86] Masters, G. 1886. Catalogue of the described Coleoptera of Australia. Part III. Proceedings of the Linnean Society of New South Wales, series 2, 1 (1): 21–126.

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