Coleoxestia chemsaki, Santos-Silva & Wappes, 2017

Santos-Silva, Antonio & Wappes, James E., 2017, Six new species and a new country record of Coleoxestia Aurivillius, 1912 (Coleoptera, Cerambycidae, Cerambycinae), Insecta Mundi 2017 (572), pp. 1-19 : 5-7

Coleoxestia chemsaki sp. nov.

( Fig. 13, 16 , 17–21 )

Description. Holotype male. Integument dark brown; head and prothorax almost black; mouthparts reddish brown with apex of palpomeres yellowish; antennae gradually lighter toward apex, with last antennomeres light reddish brown; margins of elytra black; femora dark brown, almost black, on peduncle and distal region of club (this latter abruptly darkened), orangish on remaining surface; tibiae dark brown, almost black, on basal 3/5, orangish on remaining surface; tarsomeres I–III reddish brown; tarsomeres IV–V brown; apex of ventrites II–IV and base of V yellowish.

Head. Frontal plate opaque, poorly delimited, with deep sulcus centrally from about middle (this sulcus continuing toward area between antennal tubercles); finely, sparsely punctate close to clypeus, almost smooth on remaining surface; with short, erect, sparse setae. Frontolateral depression wellmarked, opaque, finely, sparsely punctate; with short, erect, sparse setae. Area between antennal tubercles and middle of upper eye lobes opaque, with narrow, very slightly elevated carina. Area between upper eye lobes opaque, coarsely, shallowly punctate close to eyes; with short, sparse setae interspersed with moderately long, erect setae close to eyes. Remaining surface of vertex gradually shiny toward prothorax; almost smooth centrally, coarsely punctate laterally (punctures oblong close to prothorax); glabrous. Epicranial suture distinct between middle of frontal plate to middle of area between antennal tubercles. Area behind upper eye lobes shiny, coarsely, abundantly punctate; with minute, sparse setae near eye, interspersed with long, erect setae. Area behind lower eye lobes opaque, tumid, finely, sparsely punctate, with short, sparse setae interspersed with long, erect setae; with deep, well-marked sulcus close to tumid area; area between sulcus and prothorax shining (except narrow opaque area close to sulcus), coarsely, abundantly punctate close to sulcus, finely, densely striate close to prothorax, glabrous. Antennal tubercles opaque, finely, very sparsely punctate; with very sparse, short setae. Genae opaque, except for narrow, shining distal area; with minute setae close to eye, glabrous on remaining surface, except for long, sparse setae ventrally. Submentum opaque, minutely, abundantly punctate centrally, coarsely, shallowly punctate laterally; with short, moderately abundant setae interspersed with long, erect setae. Postclypeus opaque in large central area, shining laterally; finely, sparsely punctate in opaque region, smooth in shiny region; with some long, erect setae close to shiny region. Labrum shiny, coplanar with clypeus in large basal region, abruptly inclined near apex (margin dividing these regions concave); finely, abundantly punctate laterally in coplanar region; with short setae, laterally more abundant and interspersed with long, erect setae. Distance between upper eye lobes 0.30 times length of scape; distance between lower eye lobes in frontal view 0.45 times length of scape. Antennae 1.35 times elytral length, reaching elytral apex at distal quarter of antennomere XI. Scape finely, abundantly punctate, somewhat vermiculate (mainly dorsally); with minute, sparse setae interspersed with long, erect, sparse setae. Antennomere III with long, erect, sparse setae laterally and ventrally; apex nodose. Antennomere IV with long, erect, sparse setae ventrally; apex semi-angulose. Antennomeres V–VII with apex ortho-angulose. Antennomeres VIII–X with apex acute-angulose. Antennomere XI not divided; widest width 0.1 times its length. Antennal formula (ratio) based on antennomere III: scape = sulcus well-marked throughout (shallower, narrower centrally); fusiform plate well-marked, 0.67; pedicel = 0.17; IV = 0.56; V = 0.64; VI = 0.65; VII = 0.65; VIII = 0.63; IX = 0.63; X = 0.62; XI = 0.92.

Thorax. Prothorax slightly wider than long (greatest width 1.15 times length); lateral tubercles barely visible; sides of prothorax moderately shining centrally close to pronotum, opaque on remaining surface; moderately shining area coarsely vermiculate-punctate; opaque area minutely, sparsely punctate, except some coarse punctures in anterior half; with long, erect, sparse setae. Pronotum with peripheral sulcus absent centrally; fusiform plate well-marked, widened centrally; surface with five indistinct gibbosities, two anterolateral most distinct; area between anterior and posterior constrictions plicate centrally (less so on posterolateral gibbosities), except for smooth central gibbosity in basal half, interspersed with coarse, sparse punctures; sides coarsely vermiculate-punctate; with minute, sparse setae (mainly laterally), laterally interspersed with long, erect setae (mainly in basal third). Prosternum sub-opaque; basal half minutely, abundantly punctate close to sides of prothorax and procoxal cavities, coarsely, sparsely punctate laterally, smooth centrally; with short, abundant setae (interspersed with long, erect setae) laterally, mainly close to procoxal cavities, glabrous centrally; smooth between middle and peripheral sulcus, with short, sparse setae; peripheral sulcus irregularly sculptured. Prosternal process centrally glabrous, slightly carinate, laterally finely, densely punctate, except for entirely smooth apex. Mesoventrite, mesepimeron, mesepisternum and metepisternum with short, decumbent, abundant setae. Mesoventral process tuberculate centrally. Metaventrite minutely, abundantly punctate laterally, interspersed with fine, sparse punctures (this area narrowed from mesocoxal to metacoxal cavity; remaining surface finely, sparsely punctate (punctures slightly coarser toward center); area minutely punctate with short, decumbent, moderately abundant setae interspersed with long, sub-erect, sparse setae; remaining surface with short and long, sub-erect, sparse setae. Scutellum with short, decumbent, abundant setae. Elytra. Opaque, coriaceous, very finely vermiculated into network with puncture in center of nearly all areas delimited by network; with minute, sparse setae throughout, except for some long, sub-erect setae near apex; outer angle of apex with triangular projection and sutural angle with long spine; area between outer and sutural angle concave. Legs. Femora sub-clavate, finely, moderately abundantly punctate on base, gradually finer, sparser toward apex; apices of meso- and metafemora with rounded lobe; metafemora with fringe of long, erect setae ventrally. Metatibiae not sulcate laterally.

Abdomen. Shining; ventrites I–IV with short, decumbent, moderately abundant setae interspersed with long, sub-erect setae laterally (this area gradually wider toward ventrite IV), remaining surface with short and long, sparse setae; ventrite V with short and long, moderately abundant setae laterally and posteriorly, remaining surface with short and long, sparse setae; distal margin of ventrite V widely concave.

Variation. Apex of abdominal ventrites II–IV reddish brown; abdominal ventrite V entirely dark; sulcus on frontal plate reaching area close to clypeus; carina between antennal tubercles and upper eye lobes more distinct and elevated; punctures on antennal tubercles more abundant; opaque region of postclypeus finely punctate only at region close to shining region; peripheral sulcus absent only at center of pronotum, slightly marked laterally; area between outer and sutural angle of apex of elytra truncate.

Dimensions in mm (holotype male-paratype male). Total length 31.05–31.50; length of prothorax at center 4.30–4.45; greatest width of prothorax 4.95–4.50; anterior width of prothorax 3.70–3.60; posterior width of prothorax 4.60–4.40; humeral width 7.10–7.00; elytral length 22.80–23.85.

Type material. Holotype male from PERU, Cusco: Cock of the Rock Lodge (NE Paucartambo; 1400 m; 13º03.3’S / 71º31.7’W), 4-9.XI.2007, D. Brzoska col. ( FSCA) . Paratype male from PERU, Junín: Cerro Pichita Res. Sta. (2167 m), 4.XI.2009, J. B. Heppner, C. Carrera and E. Huamani col. ( RFMC).

Etymology. Named for John A. Chemsak, mentor and friend of many budding taxonomists, and a major contributor to the knowledge of North American Cerambycidae (including numerous papers on the Mexican fauna).

Remarks. Coleoxestia chemsaki sp. nov. is similar to C. femorata (Gounelle, 1909) but differs as follows (male): antennomere III with sparse setae ( Fig. 16 ); elytra ( Fig. 17 ) narrower and distinctly longer; outer apical angle of elytra with triangular projection ( Fig. 17 ). In male of C. femorata ( Fig. 21 ) the antennomere III has abundant setae ( Fig. 15 ), the elytra are wider and shorter ( Fig. 21 ), and the outer apical angle of elytra ( Fig. 21 ) has a spiniform projection. It differs from C. sanguinipes mainly by the elytra distinctly coriaceous, and from C. aurigena Martins and Monné, 2005 by the outer angle of elytra ( Fig. 17 ) with triangular projection (rounded in C. aurigena , see Bezark 2017), and the metatarsomere V is shorter ( Fig. 13 ) (longer in C. aurigena ( Fig. 14 )).

Figures

Figures 4–16. 4–8, Coleoxestia clarkei sp. nov.: 4) Holotype female, dorsal habitus. 5) Holotype female, ventral habitus. 6) Holotype female, lateral habitus. 7) Paratype male, dorsal habitus. 8) Holotype female, head. 9–12, C. eyai sp. nov., holotype male: 9) Dorsal habitus. 10) Ventral habitus. 11) Lateral habitus. 12) Head. 13) C. chemsaki sp. nov., holotype male, metatarsus. 14) C. aurigena, holotype female, metatarsus. 15) C. femorata, male, antennomere III. 16) C. chemsaki sp. nov., holotype male, antennomere III.

Figures 17–26. 17–21, Coleoxestia chemsaki sp. nov., holotype male: 17) Dorsal habitus. 18) Ventral habitus. 19) Lateral habitus. 20) Head. 21) C. femorata, male, dorsal habitus. 22–25, Coleoxestia fragosoi sp. nov., holotype male: 22) Dorsal habitus. 23) Ventral habitus. 24) Lateral habitus. 25) Head. 26) C. errata, holotype male, dorsal habitus.