Lamacoscylus obscurus, 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 : 98

Lamacoscylus obscurus sp. nov.

( Figs. 40–43 )

Description. Integument black; antennomeres III–VII with narrow orange basal ring; elytra dark-brown.

Head. Frons wider than long (greatest width equal to 1.2 times length); finely, moderately punctate; with long, moderately abundant dark setae; pubescence: thick, brownish-yellow from clypeus to middle of inferior ocular lobes; thick, white on sub-triangular area close to eyes (narrowest part near base of antennal tubercles); distinctly finer, brown on U-like central area, from middle of inferior ocular lobes to antennal tubercles. Antennal tubercles with brown pubescence. Coronal suture distinct from base to about eyes, slightly distinct towards pronotal anterior edge. Vertex coarsely, abundantly punctate; pubescence brown, short, moderately dense, but barely distinguishable in dorsal view, long, dark setae sparsely intermixed. Area behind eyes coarsely, abundantly punctate; pubescence short, brown from superior ocular lobes to distal one-third of inferior ocular lobes. Area behind inferior ocular lobes with large, sub-triangular white pubescence spot, almost reaching anterior edge of prothorax. Genae slightly shorter than inferior ocular lobe; with short, brown pubescence close to white spot, glabrous towards apex. Distance between superior ocular lobes equal to 0.3 times scape length; distance between inferior ocular lobes, in frontal view, equal to 0.6 times scape length. Antennae as long as 1.25 times elytral length, nearly attaining distal one-seventh; scape, pedicel, and antennomeres III–X with long, dark-brown setae ventrally (sparser and shorter towards antennomere X); antennal formula (ratio) based on antennomere III: scape = 0.85; pedicel = 0.18; IV = 0.76; V = 0.53; VI = 0.47; VII = 0.45; VIII = 0.40; IX = 0.38; X = 0.36; XI = 0.40.

Thorax. Pronotum coarsely, abundantly punctate; pubescence brown, short, barely visible on disc, more conspicuous laterally; with long, sparse, brown setae. Prothorax with rounded tubercle laterally near middle; coarsely, abundantly punctate, brown pubescent with long, sparse setae. Prosternum with a wide band of white, thick pubescence laterally, centrally brown, finer and less dense. Prosternal process with white pubescence. Mesosternum, mesepimera, mesepisterna, metepisterna, and metasternum (except glabrous around longitudinal metasternal sulcus) with fine, short, brown pubescence; metasternum moderately deeply sulcate at posterior onethird. Elytra coarsely, abundantly punctate; suture elevated; humeral carina distinct, attaining distal one-eighth; carinae between suture and humeral carinae indistinct; apex rounded; pubescence brown, short, dense, and abundantly interspersed with brown setae.

Abdomen. Narrow, elongate, sub-cylindrical at sides; urosternites with short, fine, brown pubescence. Legs. Coxae and femora with fine brown pubescence. Metatarsomere I as long as II–III together.

Dimensions in mm (male). Total length, 7.5; length of prothorax at center, 1.1; widest width of prothorax (between apices of tubercles), 1.4; anterior width of prothorax, 1.3; posterior width of prothorax, 1.4; humeral width, 1.9; elytral length, 5.8.

Type material. Holotype male from MEXICO, Jalisco: Parque Nacional Volcán Nevado de Colima (11 miles from highway), 11.VII.1984, J. B. Woolley col. ( USNM).

Diagnosis. Lamacoscylus obscurus differs from L. humilis (Bates, 1881) as follows: Vertex and pronotum without bands of yellow pubescence (present in L. humilis ); frons with white pubescence (absent in L. humilis ); antennomere IV with narrow orange ring at base (orange portion covers nearly half in L. humilis ). It differs from L. usingeri (Linsley, 1935) by the lack of a yellow central band on the vertex or pronotum (present in L. usingeri ), by antennomere IV being almost totally dark (versus almost totally light in L. usingeri ), and by the femora being unicolored (bicolored in L. usingeri ).

Remarks. Although there are species of Hemilophini showing variations in the presence or absence of white pubescence on metathorax (for example, Alampyris fuliginea Bates, 1881 , and Cathetopteron amoena Hamilton, 1896 ), L. obscurus also has morphological differences when compared with L. albatus as mentioned in the remarks under that species.

Etymology. Latin, obscurus = dark; relating to the color of the pubescence on the metasternum.

Figures

FIGURES 37 – 45. 37 – 39. Lamacoscylus albatus, holotype female: 37. Dorsal habitus; 38. Ventral habitus; 39. Lateral habitus. 40 – 43. Lamacoscylus obscurus, holotype male: 40. Dorsal habitus; 41. Ventral habitus; 42. Lateral habitus; 43. Head, frontal view. 44. Piruanycha pitilla Galileo & Martins, 2005, holotype female, protarsus, dorsal view. 45. Piruanycha wappesi, holotype female, protarsus, dorsal view.