Alloeorhynchus nigrofasciatus Harris
Creators: name: Brailovsky, Harry
name: Barrera, Ernesto
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Nabidae
Alloeorhynchus
Alloeorhynchus nigrofasciatus

description: Alloeorhynchus nigrofasciatus Harris
(Figs. 6–7, 11–12)
Alloeorhynchus nigrofasciatus Harris 1928: 17 –18.
Redescription. Male. Dorsal coloration. Head shiny black; antennal segment I pale castaneous suffused with dark yellow, segments II–IV dark castaneous brown; anterior lobe of pronotum included the collar shiny yellowish orange; posterior lobe of pronotum shiny yellowish orange except for black semilunar area medially on posterior margin, almost touching the posterior border of anterior lobe; scutellum dull black; clavus shiny dark castaneous brown; corium shiny dark castaneous brown with costal margin shiny yellow; hemelytral membrane pale brown, with margin dirty white; connexivum shiny yellow; connexival segments II–V with group of black spinules resembling an elongate spot; dorsal abdominal segments pale yellow. Ventral coloration. Head shiny black; rostral segments, prothorax, legs, abdominal sterna and genital capsule shiny yellow; mesothorax shiny black to reddish brown; metathorax dull black to reddish brown; spinules of femora and tibiae reddish brown; pleural margins of abdominal sterna II–V with pale brown elongate spot. Structure. Head: Antennal segment II less than twice as long as segment I; rostrum reaching anterior margin of mesosternum. Thorax. Pronotum wider than long; anterior lobe less than twice as long as posterior lobe. Hemelytron macropterous reaching anterior margin of abdominal segment VII or apex of last abdominal segment; hemelytral membrane with three cells. Parameres. Figs. 11–12.
Female. Color and habitus similar to male. Connexival segments VIII–IX, abdominal segments VIII–IX and genital plates shiny dark castaneous brown.
Variation. 1, collar pale castaneous.
Measurements. Male. Body length 4.23; head width across eyes 0.64; interocular distance 0.24; antennal segments: I 0.48, II 0.80, III 0.72, IV =ca. 0.84 (curled); pronotum: length of anterior pronotal lobe 0.68, length of posterior pronotal lobe 0.44,maximum width of anterior pronotal lobe 0.80, maximum width of posterior pronotal lobe 1.36; scutellum: length 0.60, width 0.69.
Measurements. Female. Body length 4.90; head width across eyes 0.68; interocular distance 0.24; antennal segments: I 0.49, II 0.81, III 0.74, IV =ca. 0.84 (curled); pronotum: length of anterior pronotal lobe 0.72, length of posterior pronotal lobe 0.44,maximum width of anterior pronotal lobe 0.80, maximum width of posterior pronotal lobe 1.40; scutellum: length 0.64, width 0.68.
General distribution. Guatemala.
Material examined. New records. MEXICO: Chiapas, km 108 road Palenque-Bonampak, 22-V-1980, H. Brailovsky (UNAM), 1 female. Chiapas, Comitan, 6-IV-1979, E. Barrera (UNAM), 1 female. Estado de Mexico, km 10 road Tejupilco-Temascaltepec, 20-X-1983, H. Brailovsky (UNAM), 1 female. Guerrero, 20.1 km N of San Luis Acatlan, 901 m, 17°02’19’’N- 98°44’47’’W, 10-VI-2005, E. Barrera & R. Mariño (UNAM), 3 males, 3 females. Guerrero, Iguala, Estacion de Micro-ondas Tuxpan, 1230 m, 18°24’06’’N- 99°28’53’’W, 19-III-2004, H. Brailovsky, R. T. Schuh & L. Cervantes (UNAM), 1 female. Guerrero, km 60 road Ciudad Altamirano- Zihuatanejo, 7-VI-1984, E. Barrera & H. Brailovsky (UNAM), 1 female. Guerrero, Acatempan, 1675 m, 4-II- 1989, E. Barrera, A. Cadena & L. Cervantes (UNAM), 1 male. Nayarit, Tepic, 28-XII-1973, H. Brailovsky (UNAM), 1 female. Oaxaca, Chalapa, 2-VI-1987, L. Cervantes (UNAM), 1 female. Oaxaca, km 15 Putla-Villa de Guerrero, Heroica Ciudad de Tlaxiaco, 556 m, 17°03’41’’N- 97°52’11’’W, collected running on the ground, 8-IV- 2005, L. Cervantes, E. Elizalde & S. Gamez (IEXA), 1 female. Oaxaca, km 202 road Oaxaca-Puerto Angel, Finca Pacifico, collected under leaf litter of Cecropia sp., 8-VI-2004, E. Barrera & R. Mariño (UNAM), 1 female. Oaxaca, km 14 road Mitla-Albarradas, 26-III-1 990, E. Barrera & A. Cadena (UNAM), 1 female.
Biology. It is associated with oak-pine woodland, collected under leaf litter of Quercus sp., where it was found running on the ground.
Discussion. This species resembles A. trimacula (Stein) in having the connexival segments II–V shiny yellow with a group of black spinules resembling an elongate spot; the clavus is shiny black to dark castaneous; and the corium is shiny black to dark castaneous with or without the costal margin or just the anterior third of the costal margin yellow. In A. trimacula, the collar is always black to dark brown; and the posterior lobe of the pronotum is shiny yellowish orange to reddish orange with three black marks, one at each posterior angle and along lateral edge and a triangular-shaped one at base of midline (Figs. 2–3). In A. nigrofasciatus Harris, the collar is shiny yellow and eventually suffused with pale castaneous; and the posterior lobe of the pronotum is shiny yellowish orange except for a black semilunar area medially on the posterior margin, almost touching the posterior border of the anterior lobe (Figs. 6–7).
description: Published as part of Brailovsky, Harry & Barrera, Ernesto, 2017, A review of the Mexican species of Alloeorhynchus Fieber (Hemiptera: Heteroptera: Nabidae: Prostemmatinae) with description of six new species, new distributional records, and key to the species, pp. 305-318 in Zootaxa 4338 (2) on pages 312-313, DOI: 10.11646/zootaxa.4338.2.5, http://zenodo.org/record/1036189