Amblycerus montalvoi Romero, 2011

Nápoles, Jesús Romero & Westcott, Richard L., 2011, The Bruchidae (Insecta: Coleoptera) of La Reserva de la Biósfera Sierra de Huautla, Morelos, Mexico, with descriptions of two new species and an annotated checklist, Insecta Mundi 2011 (166), pp. 1-15 : 2-4

Amblycerus montalvoi Romero , new species

Description. Male. Length (pronotum-elytra) 3.6 to 3.75 mm. Width 2.34 to 2.4 mm; maximum thoracic depth 1.86 to 1.89 mm.

Integumental color. Uniformly reddish brown; eyes shining black. Vestiture: Body covered with whitish and yellowish pubescence arranged in a very fine mottled pattern, abdominal segments with one spot of dense whitish setae on lateral areas; pygidium with one large, oval, central spot flanked by whitish setae ( Figures 1a, 1b ).

Structure. Head.- Subtriangular, densely punctulate; frons smooth, without median linear carina or impunctate median line. Eye ovoid, cleft to 0.23 to 0.31 its length by ocular sinus; medial margin of eye with row of long, fine, golden setae. First segment of antenna 1.5 to 2.2 times as long as second; third segment 1.2 to 1.5 times as long as second; segments 4 to 10 more or less with proportions of third but eccentric, 11 rounded apically; antenna reaching anterior margin of hind coxa. Clypeus covered with punctures about 0.02 mm of diameter. Labrum only with row of fine punctures on basal margin. Prothorax.- Disk subcampanulate, median basal lobe weakly convex, basal margin with carina; dorsal surface of pronotum punctulate with fine foveolae on lateral areas; carina on lateral margin reaching anterior margin of pronotum; three cervical setae. Prosternum flat, constricted between coxae, carinate laterally and rounded at apex; proepisternum finely punctulate, without foveolae. Mesothorax and Metathorax.- Scutellum slightly elongate, finely punctulate, sparsely setose, two times as long as wide, tridentate at apex. Elytron 2.45 to 2.87 times as long as broad; striae regular, moderately impressed and punctulate; strial intervals finely punctured. Mesosternum finely punctulate, tongue-like in apical area. Mesepisternum and mesepimeron finely punctulate without foveolae. Metasternum finely punctulate, without foveolae; median sulcus of metasternum 0.33 to 0.42 as long as sternum; antecoxal suture of metasternum interrupted before reaching median sulcus, bending caudad and reaching posterior margin near mesal area of metasternum. Metepisternum finely punctulate, with scattered foveolae and without transverse, fusiform curved and striate file; metepisternal sulcus forming slightly obtuse angle, with transverse axis straight and reaching lateral margin of metepisternum. Legs.- Middle and hind legs with femur punctulate, without foveolae; surface of hind coxa densely punctulate and setose in lateral two-thirds, mesal one-third polished and impunctate, except for cluster of punctures near trochanteral insertion, foveolae and cluster of punctures contiguous or nearly so; metafemur without angulate tooth on ventral margin; lateral tibial calcarium almost straight, 0.40 to 0.60 as long as basitarsus; mesal calcarium 0.80 to 0.96 as long as lateral calcarium. Abdomen.- Sterna finely punctulate, first to fourth sterna with sinuate row of foveolae; fifth sternum slightly emarginate at apex; pygidium with terminal margin rounded, surface finely punctulate, without foveolae.

Genitalia. Median lobe with lateral margins parallel or nearly so; ventral valve acuminate at apex, arcuate in lateral view; dorsal valve slightly narrower and strongly concave at base; armature of internal sac with a shoe-shaped apical sclerite; median wishbone-shaped sclerite flanked on either side by a blade with outer margin serrate, two lateral spine-shaped sclerites with tooth on lateral margin near apex, and two basal thin angulate sclerites; ejaculatory duct

lined with spinules (Figure 2a). Lateral lobes cleft

to one-tenth their length, clothed with fine pubes-

cence; a pair of pads between lateral lobes near

apex (Figure 2b).

Female. Length (pronotum-elytra) 2.76-4.80

mm. Width 1.44-2.94 mm; maximum thoracic

depth 1.2-2.34 mm. Females are very similar to

males, except 5th abdominal sternum not emar-

ginate at apex ( Fig. 1c , 2d).

Distribution. Mexico (Morelos).

Figures

Figure 1. Amblycerus montalvoi. A) Male dorsal view. B) Male lateral view. C) Female dorsal view. D) Female lateral view.