Tyloderma pseudofoveolatum Wibmer, 1981
Family: Curculionidae
Tyloderma pseudofoveolatum image
Michael Jansen  
5. Tyloderma pseudofoveolatum Wibmer, new species Holotype male.-Body elongate oval, moderately convex; cuticle generally matte, antennae brownish red; with short, moderately slender to broad, yellowish brown, recumbent scales, forming generally dense spots or bands. Rostrum with short, deep, longitudinal sulcus near middle. Head with frontal sulcus short; punctures medium sized, moderately deep, unevenly moderately dense above and between eyes, smaller, shallower, somewhat sparser toward vertex. Prothorax (fig. 10) as long as wide, moderately constricted on flanks, not constricted dorsally near apex, sides diverging strongly in ca. basal 2/5, converging strongly to constriction, then moderately toward apex; pronotal disc with scales on each side primarily as 1 band on basal 2/5, 1 spot 3/5 from base; closer to midline, and 1 more or less elongate apical spot; impunctate median line moderately distinct; punctures more or less evenly dense, generally separated by 1/4 their own diameters or less on disc and flanks. Elytra (fig. 10) 1.56 times as long as wide, 2.00 times as long as prothorax, humeri romded, very prominent, sides subparallel in basal 1/2, then converging toward apex; scales on each elytron primarily as U-shaped band on basal 1/3, with base of "U" along interval 6, more or less transverse band near middle, and broad band across declivity; strial punctures on basal 1/2 of disc round, slightly smaller and shallower than pronotal punctures, generally separated by their own diameters, on lateral striae slightly deeper and denser, size and depth decreasing very gradually toward apex on dorsal striae, more rapidly on lateral striae; strial grooves subobsolete; intervals generally straight, some weakly sinuate at base, moderately convex. Mesosternum with lateral processes ca. 2/3 from anterior margin, distinct, posterior margin moderately wide; surface with medium sized, moderately deep, moderately dense punctures, each with medium sized, moderately coarse seta, subrecumbent along anterior margin, suberect on remaining area. Metasternum nearly flat on median area; punctures subequal on median and lateral areas. Abdomen with sternum 1 weakly concave along midline; punctures medium to large, deep, unevenly moderately dense on sterna 1 & 2. Legs with femur densely covered with short to medium, moderately coarse to coarse, recumbent to subrecumbent setae; tibia with surface moderately rugosely striate, densely covered with medium to long, moderately coarse to coarse, subrecumbent to suberect setae; praemucro small on all tibiae, ca. 1/7 from apex, more or less perpendicular to axis of tibia (fig. 54). Genitalia: fig. 73. Length (pronotum + elytra): 5.25 mm. (1.75 + 3.50). Allotype female.-Abdominal sternum 1 moderately convex along midline; praemucro large. Genitalia: fig. 102. Length (pronotum + elytra): 5.08 mm. (1.70 + 3.38). Intraspecific variation.-The scales are yellowish to yellowish brown. The rostrum is 1. 73-1.83 times as long as its width at the apex, and its median sulcus is sometimes only weakly distinct. The punctures above and between the eyes may be small, shallow to moderately shallow. The prothorax has a ratio (length/width) of 0.95-1.10 (1.00 ± 0.04), widest between nearly 2/5 from the base and about the middle. The elytra are 1.42-1.61 (1.53 ± 0.05) times as long as wide, and 1.74-2.17 (2.00 ± 0.10) times as long as the prothorax, with their widest point usually located both at the humeri and another point between 1/4 and 2/5 from the base, weakly concave between, rarely located only at the humeri. The strial punctures are sometimes denser on the disc, generally separated by less than their own diameters. Strial groove 9 may be moderately distinct between the middle and 3/4 from the base; and intervals 3 to 9 are slightly to distinctly raised at their apices. The lateral processes of the mesosternum are sometimes very distinct; and abdominal sternum 5 of some females is slightly to strongly impressed on each side. The praemucro is oblique to the axis of the tibia and directed away from the mcus on some males. Length, pronotum + elytra: 4.00-6.15 mm. (5.11 ± 0.47). Remarks and comparative notes.-This species is distinguished from morbillosum and neomorbillosum, and in part from foveolatum, by its more slender body and relatively smaller prothorax. It looks similar to foveolatum, but can be separated from that species and from angustulum (the other elongate species in the Foveolatum group) because it has an elytral scale pattern with more abundant scales, and coarser setae on the legs. I have seen the specimen from Chihuahua mentioned by Champion (1905), and am able to state that his was a misidentification. Ktymology.-I have selected this name to indicate that the habitus of this species is similar to that of foveolatum. Type-locality. U.S.A., Texas, Dickens County, North Fork Wichita River, 5 miles southwest of Dumont.