Stultutragus mataybaphilus, Clarke Abstract, 2010

Clarke Abstract, Robin O. S., 2010, Bolivian Rhinotragini Iii: New Genera And Species (Coleoptera, Cerambycidae), Papéis Avulsos de Zoologia 50 (16), pp. 239-267 : 257-259

Stultutragus mataybaphilus sp. nov.

Figs. 6A, 6B

Holotype male: 7.2 mm. Deposited at MNKM.

Diagnosis: Stultutragus mataybaphilus is readily separated from S. crotonaphilus by completely yellow legs and pronotum (and other differences of colour distribution) and: inferior lobes of eyes of males separated by distance smaller than width of pedicel; elytra not uniformly punctured; the yellow fascia on elytra with smaller, less dense punctures than adjacent black areas. The distance between the inferior lobes of eyes of S. crotonaphilus is distinctly greater than width of pedicel, and the elytra almost uniformly punctured.

General colour: black and translucent yellow. Head and mouthparts yellow (including frons between eyes and area between antennal tubercles) except vertex adjacent to inner and hind margins of superior lobes of eyes, and apex of mandibles black. Antennal scape, pedicel, antennomere III, and apex of IV and V chestnut, the rest duskier, base of IV-XI annulated yellowish, the annulations incrementally shorter towards apex of antenna. Remainder of body, scutellum and legs yellow (apices of tibiae, and tarsi slightly darker), the following black: anterior border of pronotum, apical half of metasternum, all of metepisternum and urosternite III. Elytra black, the following yellow: a broad chevron-shaped fascia across elytra on basal third, and similar, slightly narrower, transverse fascia on apical third.

General pubescence: body almost glabrous, and entirely lacking long setae; shorter setae on the following: antennal segments I-V, disc and small group on sides of pronotum, sides and apices of femoral claves, and tibiae. Apex of frons with dense very fine pubescence. Mesofemoral peduncle fimbriate. Urosternite V pubescent.

Surface ornamentation: nearly all of dorsad heavily punctured, and nearly all of underside impunctate. Labrum with transverse line of six punctures; base of clypeus and adjacent area of frons and genae finely and irregularly punctate; vertex with dense, semi-confluent punctures of moderate size. Basal 4/5 of pronotum with somewhat irregular, large, alveolate punctures, less irregular to each side of midline, those on midline almost rectangular, and together latticelike; apical 1/5 smooth, a few scattered punctures at midline; sides of pronotum without apparent sexual puncturation. Elytral puncturation fine and sparse on yellow fascia; large, dense and alveolate at humeri; smaller, denser, and somewhat scabrous on central and apical black fascia. Underside of head closely, but finely, carinate with scattered punctures. Centre of prosternum reticulate with irregular punctures. Shallow, confused, small punctures cover urosternite V.

Structure: head with eyes (1.2 mm), about as wide as pronotum; rostrum narrow and long (0.35 mm), more than half length of inferior lobes of eyes (0.65 mm); labrum narrow and wide. Eyes convex and large; inferior lobes almost contiguous on front; interocular distance (0.05 mm) twelve times narrower than width of one lobe; width of superior lobe (0.15 mm) half interocular distance. Antennae reach apical third of urosternite II; moderately narrow; antennomeres III-V filiform; VI-X distinctly broader, serrate, the apex of the “teeth” blunt; scape subcylindrical, much shorter (0.55 mm) than antennomere III (1.05 mm); IV very short (0.4 mm); V (0.6 mm); VI and VII (both 0.5 mm); VIII-X (all 0.4 mm); XI (0.45 mm) with small cone at apex. Prothorax: cylindrical, slightly longer (1.50 mm) than wide (1.25 mm), sides round- ed, widest at middle; apical constriction weak; basal constriction short but strong; front margin (1.0 mm) and hind margin subequal. Prosternal process slightly arched with sides strongly raised; base very short, widening to apical triangle well before middle of coxae; apical angles of triangle rounded. Coxal cavities closed at sides and behind. Pronotum convex; middle half to either side of midline as far as sides of prosternum raised into one irregularly shaped callus; area of midline, especially towards base, depressed and broad, with ill defined carinas to either side of centre; side of base with single deep fovea. Mesothorax: mesosternal declivity abrupt; mesosternal process moderately narrow (0.15 mm), about one-third width of coxal cavity, apex somewhat cordiform. Scutellum small, rectangular and truncate at apex. Elytra flat, basal and apical thirds slightly convex, humero-apical costa absent; epipleur inclined from immediately behind humeri, flat for apical half; reaching middle of urosternite IV, three times longer (4.2 mm) than width of humeri (1.4 mm), base inclined posteriorly; humeri slightly projecting forwards, hiding sides of mesosternum and base of metepisternum; sides moderately strongly narrowing to middle, and slightly widening to broad apex; not dehiscent; suture straight, without gape; apex strongly and obliquely emarginate, sutural angle with small tooth, lateral angle produced to form long, broad-based tooth. Metathorax: metasternum tumid; mesocoxae lying well below level of metasternum; metasternal suture entire, and deep posteriorly. Metepisternum large, very broad at base, moderately acuminate to apex. Metasternal process a low triangle in shape; apex blunt and intimately connected with apex of mesosternal process. Abdomen: convex, narrow and subcylindrical, broadest at base, slightly narrowing from urosternite III, individual urosternites slightly rounded at sides. Legs: moderately robust, peduncles rather short; pro- and mesofemoral claves large and fusiform, ventrally spiculate; metafemora not reaching apex of elytra, clave narrow and subcylindrical, slightly spiculate. Metatibia slightly flattened, only widened at extreme apex, Metatarsomere I slightly shorter (0.35 mm) than II + III (0.40 mm).

Variation: the basal yellow fascia on the elytra of three specimens joins the scutellum, and in one specimen (from the Reserva Natural Potrerillo de Guenda) the apical yellow fascia is absent on one elytron, represented by small yellow dot on the other. Rostrum of one specimen shorter (0.25 mm), less than half length (0.60 mm) of inferior lobes of eyes. Humeri of two males are less oblique. The femoral claves of one specimen has ventral spicules much reduced.

Female ( Fig. 6B ): pronotum and abdomen unicoloured. Elytra of one female with anterior fascia distinctly narrower and posterior fascia absent. Rostrum broader and relatively longer 0.45 mm, length inferior lobe 0.55 mm. Eyes smaller and less convex; inferior lobes separated by 0.4 mm, width of lobe 0.5 mm, not approaching antennal condoyle; interocular raised above level of eyes, strongly and densely punctured. Antennae slightly shorter, reaching middle of urosternite II. Length pronotum (1.45 mm), width 1.35 mm). Length of elytra (4.55 mm), width of humeri (1.6 mm), reaching base of urosternite V. Apex prosternal process trapezoidal. Mesosternal process narrower, about ten times narrower than width of coxal cavity. Abdomen large and fusiform, widest at base of urosternite II, V trapezoidal, almost quadrate, apical margin truncate. Abdominal process flatter and not sharply pointed at apex.

Measurements (mm): 5 males / 2 females: total length 6.2-7.7/7.2-7.7; length of pronotum 1.30-1.45/1.55; width of pronotum 1.00-1.25/1.30-1.35; length of elytra 3.70-4.4/4.50-4.55; width at humeri 1.20-1.35/1.55.

Type material: Holotype male, BOLIVIA, Santa Cruz: Hotel Flora & Fauna, 5 km SSE of Buena Vista , 17°29’96”S/ 63°39’13”W, 430 m, 17.X.2006, R. Clarke & S. Zamalloa col., on/flying to flowers of “Sama blanca chica” ( MNKM).

Paratypes with same data as holotype: 1 male, 20.X.2005 ( RCSZ); 1 male, 18.X.2006 ( MZUSP); 1 male and 1 female 26.X.2006 ( RCSZ); 1 male, 21. IX .2007 ( MNRJ) . Paratype with different data: Santa Cruz, Reserva Natural Potrerillo de Guenda , 370 m, 40 km NW Santa Cruz, 17°40’S / 63°27’W, 1 female, 16-21.X.2007, F. & J. Romero col. ( ACMS) .

Etymology: combination of matayba the host flower genus, and Latin philus, to like, or be attracted to.

Figures

FIGURES 6‑7: 6. Stultutragus mataybaphilus sp. nov., A. male holotype, B. female paratype. 7. Stultutragus crotonaphilus sp. nov., A. male holotype, B. female paratype.