Mesosaimia Breuning, 1938

Yamasako, Junsuke, 2014, Review of the genus Mesosaimia Breuning with description of a new species (Coleoptera: Cerambycidae: Lamiinae: Mesosini), Zootaxa 3852 (4), pp. 461-474 : 462-463

Mesosaimia Breuning, 1938

Mesosaimia Breuning, 1938: 206 .

Type species: Mesosaimia robusta Breuning, 1938 (by monotypy).

Trichipocregyes Breuning, 1950: 521 .

Type species: Trichipocregyes mausoni Breuning, 1950 (by monotypy). Syn. nov.

Redescription. Body robust and oblong, larger in Mesosini , length ca. 17.0–22.0 mm; dorsal surface with sparse long suberect hairs throughout. Eye nearly subdivided into two lobes but lower and upper lobes connected posteriorly by 1–2 rows of ommatidia; lower eye lobe weakly prominent, length subequal to width or slightly longer vertically. Antennal tubercle well elevated. Antennae fairly long, ca. 1.7–1.8 times as long as body length in male and subequal or slightly shorter in female; scape long, thickened apically and projected outwardly near apex, with a developed cicatrix on apex; antennomere 3 much longer than scape and antennomere 4, respectively; antennomere 11 of male strongly bent medially near apex, becoming dilated apically in spatulate shape. Pronotum wider than long, weakly expanded laterally near middle, transversely constricted near apical and basal margins; disk more or less depressed near apex, swollen into two mounds at middle. Prosternal process roundly sloped in lateral view; lateral margin weakly ridged in ventral view. Mesosternal process nearly truncate in lateral view, sulcate medially with well ridged lateral margin in ventral view; the ridges forming pair of small tubercles near apices. Elytra ca. 1.5–1.6 times as long as humeral width; each elytron raised beside scutellum and subquadrately projected latero-anteriorly near middle along basal margin, swollen longitudinally near middle behind base; humeri subquadrate, sometimes weakly expanded antero-laterally. Mesotibiae without distal notch on outer margin.

Male genitalia: Tegmen in dorsal view wide rhombic, widest near middle with ringed part well expanded laterally near the middle of tegmen, arcuately narrowed basally and fused in basal part, weakly curved ventrally in lateral view; lateral lobe thick, ca. 1/4 of the total length of tegmen. Median lobe thick in dorsal view, weakly curved in lateral view. Endophallus long and thick, divided into BPH, MPH and APH; MPH subdivided into MT+CT and PB by a constriction. Total length of endophallus subequal or slightly longer than triple length of median lobe; the length of BPH and PB nearly half of the length of median lobe, respectively, but MT+CT variable; APH rudimentary or weakly developed. BPH with a well-developed basal swelling near CS on ventral side; APH with a single ED arisen from basal part. MSp minute, indistinctly colored, arranged in apical half of MT+CT; LSp small, unidentate, distributed in basal half of MT+CT; SSp minute, densely distributed in PB.

Differential diagnosis. This genus is characterized by a rather robust body shape, nearly subdivided eye, long male antennae with strongly bent and apically dilated last segment, and mesosternal process sulcate medially with well-ridged lateral margins which form a pair of small tubercles near the apices. The genus is similar to Metipocregyes Breuning, 1939 among the genera of Mesosini , but is distinguishable from the latter by the following characteristics: body large and robust; lower eye lobe weakly prominent, length subequal to width or slightly longer vertically; male antennae with antennomeres 11 strongly bent near apex. The genus is also different from Trichomesosa in having a robust body, subdivided eye, well-thickened antennal scape, mesosternal process with ridged lateral margins forming a pair of apical tubercles. Also, the endophallus of this genus can be characterized by the following structures: endophallus long and thick; PB long, nearly half the length of median lobe; APH rudimentary or weakly developed; LSp small and unidentate.