Tyloderma lecontei Wibmer, 1981
Family: Curculionidae
Tyloderma lecontei image
Michael Jansen  
27. Tyloderma lecontei Wibmer, new species Holotype male.-Body moderately oval, weakly convex; cuticle black with antennae brownish black. Rostrum with moderately distinct, longitudinal carina on apical 3/5, evanescent toward base; dorsal surface not rugose, punctures very small, shallow, unevenly moderately dense (much deeper on sides) on basal 1/2, on apical 1/2 slightly larger, deeper. Bead lacking impunctate spot of strongly reticulate integument and lacking oblique sulcus above each eye, with long, deep, longitudinal sulcus on middle of vertex; punctures medium sized, moderately shallow to moderately deep, moderately dense above eyes, much smaller and shallower on frons and toward vertex. Prothorax 1/20 longer than wide, moderately constricted on flanks near apex, sides widest at base and near middle, moderately concave between, converging moderately to constriction, then weakly toward apex, not convex in front of constriction, ocular lobes well developed; pronotal disc lacking impressions, punctures minute on disc, transverse subapical band of punctures weakly distinct, few punctures on flanks (fig. 31), small to medium sized, shallow, unevenly moderately sparse along constriction and above and in front of procoxae. mytra 1.40 times as long as wide, 1.84 times as long as prothorax; humeri rounded, moderately prominent, sides weakly concave behind humeri, diverging weakly in basal l/3, then converging toward apex; punctures on basal l/2 of most dorsal striae small, shallow, unevenly sparse, generally separated by 4 times their own diameters or more, scarcely distinct along base, on striae 1, 9 & 10 larger and deeper, on 9 & 10 denser; intervals nearly flat; macropterous. Metasternum more or less flat on median area; punctures medium sized, moderately shallow, unevenly moderately sparse. Abdomen with sternum 1 moderately concave along midline, sternum 2 moderately convex, sterna 3 & 4 strongly longitudinally convex (easily seen in lateral view), sternum 5 with shallow, transverse impression on apical 1/3; punctures very small to small, sparse on sterna 1 to 4, on sternum 5 small and moderately dense. Legs blackish, femur rather sparsely covered with moderately coarse setae; tibia rather sparsely covered with short to medium, moderately coarse, recumbent to subrecumbent setae; uncus weakly oblique to axis of tibia. GenitaJia: fig. 93. Length (pronotum + elytra): 2.70 mm. (0.95 + 1.75). Allotype female.-Abdominal sterna 1 & 2 convex, impression on sternum 5 moderately deep; uncus oblique, praemucro more or less perpendicular to axis of tibia. Genitalia: fig. 121. Length (pronotum + elytra): 3.02 mm. (1.05 + 1.97). Intraspecific variation.-The antennae are sometimes reddish. The rostrum is 1. 71- 1.92 times as long as its width at the apex; the rostral carina often reaches the base of the rostrum, although rarely it is indistinct. The sulcus present on the vertex is sometimes short, or more or less round, shallow, rarely scarcely distinct. Sometimes it reaches the frons, being deeper on both ends, and rarely it is scarcely distinct on the middle, appearing as 2 round foveae. The punctures may be small, shallow or moderately shallow above the eyes. The prothorax has a ratio (length/width) of 0.97-1.11 (1.04 ± 0.04), widest usually at the base and near the middle, weakly concave between, sometimes diverging weakly in the basal l/5 to 1/2; the punctures are larger and denser on the flanks. The elytra are 1.26-1.50 (1.37 ± 0.06) times as long as wide, and 1.70-2.06 (1.83 ± 0.08) times as long as the prothorax, with the humeri moderately obtuse and weakly distinct. Their widest point is located between about 3/10 and 2/5 from the base, and rarely at the humeri as well. The strial punctures are denser on the basal 1/2 of the disc, generally separated by about 3 times their own diameters, and rarely they are medium sized and moderately deep. The strial grooves are sometimes distinct in part, narrow, sinuate, and discontinuous. The punctures can be moderately dense or rarely moderately deep on the lateral areas of the metasternum. Abdominal sternum 1 is sometimes rugose between the metacoxae. The legs of some specimens are primarily reddish or reddish brown, sometimes with the base and apex of both femur and tibia darker. Length, pronotum + elytra: 2.25-3.35 mm. (2. 73 ± 0.24). Remarks and comparative notes.-In the Punctatum group, this species can be distinguished from all but minimum by its smaller punctures on the head above the eyes and by its smaller elytral strial punctures. It can be separated from minimum because the latter has the prothorax strongly constricted on the flanks, and the legs nearly glabrous and distinctly more reddish. This species somewhat resembles those belonging in the Aereum group (especially capitale), but it has much shallower, sparser punctures on the lateral areas of the metasternum, Its pronotal punctures form a transverse subapical band, and its rostrum is not rugosely punctate, or only weakly so on the sides. In addition, most of the specimens in the Aereum group lack a longitudinal frontal sulcus. Etymology.-I am pleased to name this species for Dr. J. L. LeConte, who made numerous contributions to the study of Coleoptera in general and to the Curculionoidea in particular. Type-locality.-U.S.A., Florida, Leon County, Tall Timbers Research Station, Sheep Island.