Bilobatus Machatschke, 1970

Allsopp, Peter G., 2021, The Australian endemic genera Mesystoechus Waterhouse, 1878, Amblochilus Blanchard, 1851, and Bilobatus Machatschke, 1970 revisited (Coleoptera Scarabaeidae: Rutelinae: Anoplognathini), Zootaxa 4965 (2), pp. 363-374 : 370-371

Bilobatus Machatschke, 1970

Homotropus Waterhouse, 1878: 226 (junior homonym of Homotropus Förster, 1868 ).

Bilobatus Machatschke, 1970: 157 (replacement name for Homotropus Waterhouse, 1878 ; nec Bilobatus Sieg, 1993 (= Siegius Allsopp, 2017 )).

Type species. Homotropus luridipenns Waterhouse, 1878 , by monotypy.

Diagnosis. Males. Anoplognathini: Schizognathina. Labium slightly convex in profile, apex bilobed; palps with 3 palpomeres, apical palpomere straight. Maxilla with galea very short, not toothed; palp short, apical palpomere about twice as long as preceding palpomere, broad with moderately impressed sensorium. Mandibles with single apical tooth, molar edge without ridges, incapable of contact at apices. Antennae with 10 antennomeres, club large, slightly curved, about as long as shaft and much longer than terminal palpomere of maxillary palp. Labrum with a small anteroventral process contiguous with distal margin of labium, lower margin produced to a point in the middle. Clypeus with disc concave and sides recurved, sides convex in outline, sometimes contracted to a notch before strongly recurved anterior margin. Clypeofrontal suture obliterated and replaced by a posteriorly angulate ridge extending from ocular canthi. Ocular canthi transverse, normal length. Eyes prominent in males. Frons with erect setae. Pronotum less strongly convex than in females, anterior angles obtuse and bearing dorsal setae, marginal ridge continuous, disc with a vague median longitudinal line. Elytra coarsely sculptured, intervals costate, epipleurae with fine setae, non-membranous. Prosternal process small, concealed by dense thoracic and costal setae. Mesoventrite not forming a process. Abdomen with abundant setae. Protibial teeth well developed; protarsi with tarsomere 1 about twice length of tarsomere 2. Metathoracic legs slender. Metatarsi short in males. Claws short and stout, larger claws of mesothoracic legs and metathoracic legs simple.

Females. Apical palpomere of labium cylindrical. Antennal club shorter than shaft and less than twice as long as terminal palpomere of maxillary palp. Clypeofrontal suture distinct. Eyes normal. Pronotum strongly convex. Protibial teeth strongly developed; protarsi with tarsomere 1 as long as tarsomere 5 and as long as tarsomeres 2–4. Metathoracic legs more robust.