Aegomorphus mexicanus, Martins, Ubirajara R., Santos-Silva, Antonio & Galileo, Maria Helena M., 2015

Martins, Ubirajara R., Santos-Silva, Antonio & Galileo, Maria Helena M., 2015, Fourteen new species, one new genus, and eleven new country or state records for New World Lamiinae (Coleoptera, Cerambycidae), Zootaxa 3980 (1), pp. 81-105 : 94-95

Aegomorphus mexicanus sp. nov.

( Figs. 32–35 )

Description. Integument dark-brown; parts of head black; antennomeres V–XI with basal two-thirds whitishyellow; tibiae brownish-yellow with two dark-brown rings.

Head. Frons rectangular, wider than long; pubescence dense, white. Vertex tumid on each side of coronal suture; pubescence moderately dense white to whitish-brown. Area between antennal tubercles and superior ocular lobes depressed; punctures coarser than on frons; pubescence white. Coronal suture distinct from clypeus to anterior edge of prothorax. Antennal tubercles white pubescent. Area behind ocular lobes finely, densely punctate; pubescence close to superior ocular lobe brown, gradually lighter towards apex of inferior ocular lobes. Distance between superior ocular lobes equal to 0.75 times scape length; distance between inferior ocular lobes, in frontal view, equal to 1.20 times scape length. Antennae as long as 1.6 times elytral length; attaining elytral apex near apex of antennomere VIII; scape with grayish pubescence, dorsally absent on large area (rubbed?); antennomere III with ring of grayish pubescence on base and another wider one near middle; pubescence on antennomere IV as on III, but separation between two rings less distinct; antennomeres V–XI with inconspicuous grayish pubescence on basal two-thirds, not very conspicuous; antennal formula (ratio) based on antennomere III: scape = 0.70; pedicel = 0.20; IV = 0.92; V = 0.56; VI = 0.46; VII = 0.44; VIII = 0.34; IX = 0.31; X = 0,24; XI = 0.26.

Thorax. Prothorax narrower than elytral base (0.8 times); lateral tubercles large, conical. Lateral tubercles on pronotal disc large, conical; central tubercle well marked from basal one-fourth to middle, slightly elevated, carinalike from middle to apex; disc coarsely, abundantly punctate around tubercles; pubescence gray to brown, denser in some areas with sparse, long setae. Pro-, meso- and metasternum with grayish pubescence, laterally denser, absent in some areas; metasternum without distinct punctures. Metepisterna with dense gray pubescence. Scutellum gray pubescent. Elytral dorsal carinae only present at basal sixth; coarsely, moderately punctate on basal half, gradually finer and sparser towards apex; apex slightly obliquely truncate; pubescence gray to white, and yellowish-brown, very distinct in some areas, shorter, less distinct in others forming complex pubescent pattern ( Fig. 32 ).

Abdomen. Without distinct punctures; pubescence gray, moderately dense. Legs. Gray pubescence forming three distinct rings on tibiae: one narrow, near base; another wide, near middle; the third, wide at distal fourth. Dorsal surface of tarsomeres mostly gray pubescent; metatarsomere I as long as II–III together.

Dimensions in mm (male). Total length, 8.4; length of prothorax at center, 1.8; widest width of prothorax (between apices of tubercles), 3.0; anterior width of prothorax, 2.6; posterior width of prothorax, 2.4; humeral width, 3.5; elytral length, 6.0.

Type material. Holotype male from MEXICO, Guerrero: Highway 95, 2.4 km S Milpillas (on Acacia farnesiana (L.)), 24.VII.1992, G. H. Nelson col. ( FSCA).

Diagnosis. Aegomorphus mexicanus resembles A. peninsularis (Horn, 1880) , but differs mainly by the elytral pattern. Aegomorphus mexicanus has two semi-elliptical maculae of white to gray pubescence, partially margined anteriorly and posteriorly by narrow dark line. In A. peninsularis the areas with light pubescent maculae are not darkly margined and the anterior maculae are more oblique.

Remarks. Acanthoderes Audinet-Serville, 1835 , Pardalisia Casey, 1913 (currently subgenus of Acanthoderes ), Symperasmus Thomson, 1864 (currently subgenus of Acanthoderes ), Aegomorphus Haldeman, 1847 , and Psapharochrus Thomson, 1864 need a complete revision to establish the limits and characters defining them. Although the original definition of Aegomorphus is not useful for separatingit from Acanthoderes (Acanthoderes) , the comparison between the type species of each indicates that many species currently allocated to the latter do not agree with the type species (body shape, form and length of antennae, elytral apex, etc.). The comparison with the type species of Acanthoderes (Symperasmus) , which has a distinct elytral carina, and Acanthoderes (Pardalisia) also excludes these subgenera as the place for the new species. Thus, by exclusion, we believe that currently the genus best suited for the new species is Aegomorphus .

Etymology. Relating to the country of the type locality.

Figures

FIGURES 23 – 36. 23 – 24. Scleronotus virgatus, holotype, male: 23. Head, frontal; 24. Lateral habitus. 25 – 27. Oreodera casariae, holotype male: 25. Dorsal habitus; 26. Lateral habitus; 27. Head, frontal view. 28 – 31. Psapharochrus langeri, holotype male: 28. Dorsal habitus; 29. Ventral habitus; 30. Lateral habitus; 31. Head, frontal view. 32 – 35. Aegomorphus mexicanus, holotype male: 32. Dorsal habitus; 33. Ventral habitus; 34. Lateral habitus; 35. Head, frontal view. 36. Lamacoscylus albatus, holotype female, head, frontal view.