Euscelus angulosus Gyllenhal

Hamilton, Robert W., 2007, Euscelus species of the West Indies (Coleoptera: Attelabidae), Zootaxa 1495 (1), pp. 1-34 : 11-12

Euscelus angulosus Gyllenhal

( Figs. 5 , 29–32)

Attelabus angulosus Gyllenhal, 1833

Attelabus angulatus Schoenherr, 1859

Euscelus cancellatus Voss, 1925

Type locality: Cuba

Type data: Holotype male with the following labels: Male symbol [small white rectangular]; Typus [long red rectangular]; att. angulosus, Cuba [white rectangular]; Naturhistoriska Riksmuseet, Stockholm, loan no. 60802 [blue rectangular]. The holotype is in poor condition with missing leg segments and only the bases of the posthumeral denticles remaining.

Type holder: Naturhistoriska Riksmuseet , Stockholm, Sweden ( NHRS)

Specimen data: CUBA: 2 males & 1 female, Cayamas, Baker ( SEMC) . 1 male, Cayamas , 2-xii, EA Schwarz ; 1 female [same as previous except 1-x]; 1 male & 1 female, Baragua , 13-x-1928, LC Scaramuzza ; 1 male, Isles of Pines , 28-vi-1950, sweeping under mango-citrus trees, Berg & Linkes ( USNM) .

Description: Color: Reddish-brown throughout. Size range: Male (n = 6) 4.5 x 2.0 mm to 7.0 x 2.9 mm; Female (n = 3) 5.0 x 2.0 mm to 5.8 x 2.4 mm. Head elongate, sub-rectangular, slightly wider at base; moderately punctured; lateral punctures more dense; lateral and ventral punctures bearing short fine setae; interspaces finely strigate; frons narrow, about ½ width of rostral base; with short wide, deep channel between eyes. Rostrum shorter than head, widened beyond antennal insertions; apex 1/3 wider than rostral base; punctured throughout; lateral punctures dense. Antennae longer than head and rostrum together; scape ovo-globose, robust; funicle segment 1 only ½ as long as scape, weakly clavate; funicle segments 2 and 6 subequal in length, clavate, segment 6 wider at apex; funicle segments 3–5 longer than 2 or 6, clavate; funicle segment 7 subequal to 6 in length but apically more widened and cone shaped; club elongate, nearly as long as funicle; basal and middle club segments subequal, cylindrical, terminal segment whitish, longer, strongly acuminate. Pronotum wider than long, widest at base, arched out above procoxae; disk at middle with three smooth dome-shaped protuberances separated by deep grooves; with deep oblique line like groove each side of middle; interspaces rugose, with irregular coarse punctures; anterior collar distinctly set off by deep groove, smooth, raised, band like; anterior basal carina wide, with few irregular punctures, distinctly set off by straight deep groove; posterior basal carina narrow, only about ½ as wide as anterior carina. Scutellum sub-trapezoidal, at base 1/3 wider than long; with dome like posterior protuberance; punctures coarse, irregular; sides sinuate; posterior margin with rounded corners and weak median angle. Elytra longer than wide, slightly narrowed from humeri to apices; strial punctures large irregular, deep; intervals and interspaces raised, reticulate; intervals 2, 4 and 6 distinctly carinate, fusing posteriorly into prominent blunt protuberance at declivity; interval 7 weakly carinate, carina ending near apex; interval 8 weakly carinate at apex, fusing with base of protuberance formed by carinae 2, 4 and 6; humeri simple; with broadly triangular posthumeral projection. Abdominal ventrites sparsely punctured, sparsely setose; punctures more numerous laterally.

Femoral sexual dimorphism: The profemur in males is armed with two widely separated projections. The disti-ventral projection is sub-triangular with a blunt tip and the mid-ventral projection is more acute and elongate with the tip strongly bent upward. An oval rimmed setose sensillum occurs near the outer base of the mid-ventral projection. The profemur in the female is also armed with two projections. The disti-ventral projection is beak-shaped and the mid-ventral projection is small, straight, acute and directed anteriorly.

Distribution: All specimens examined are from Cuba. O’Brien and Wibmer (1982) list it from Cuba and the Dominican Republic.

Comments: This species is recognized by the overall reddish-brown color, the 3 dome like structures at the center of the pronotal disk and the triangular posthumeral elytral projections. The female lacks the declivitous elytral protuberance present in the male.

Host plant: Host plant association is unknown.

Figures

FIGURES 5–8. Male genitalia of West Indies Euscelus species, 64 X: a) tegmen, dorsal view b) median lobe with endophallic sac and transfer apparatus in repose, ventral view 5) Euscelus angulosus, Cuba, Isle de Pinos 6) Euscelus scrobiculatus, Dominican Republic, South of Barahona 7) Euscelus uviferae, Haiti, Aux. Cayes 8) Euscelus biguttatus, Jamaica, St. Catherine Parish.