Neorhagio caligatus, Santos, 2006

Santos, Charles Morphy Dias Dos, 2006, Description of two new species of Neorhagio (Diptera, Tabanomorpha, Rhagionidae), and remarks on a controversial female character, Zootaxa 1174, pp. 49-62 : 51-57

Neorhagio caligatus sp. n.

Figures 1–9

Material

Holotype ♂, MEXICO, Reserva El Triunfo , Sendero Mono, Jaltenango, 6840m, 15º 39’N 92º 48’W, 19­22/VII/1997, Malaise trap, A. González col. ( MZFC) . 5 ♂ and 5 ♀ paratypes, the same as holotype ( MZFC).

Diagnosis

Wing brownish, with light brownish stripes; setulae dorsally on R 1, R 2+3, R 4+5, R 4, R 5, M 1, M 2, CuA, CuA 1 and CuA 2; A 1 short and strongly curved; M 1+2 after cross­vein m­m; cubital posterior cell widely open; alula absent. Gonostyle long, rounded distally, with a broad knob at mid­outer surface, close to the articulation with the gonocoxites. Short distal apodemes of sternite IX in female.

Description

MALE. Body length 5.5–6.0 mm. Wing length 5.7–6.0 mm. General color brown. Dichoptic eyes, brown to black, facets homogenous, ocellar tubercle brown with prominent bristles ( Fig. 1 ), ocelli yellow to brown. Gena dark brown, clypeus lighter than gena, bulbous protruded. Antenna light brown; scape and pedicel subglobose, with long bristles; scape shorter than pedicel; first flagellomere rounded, shorter than scape; arista with flagellomeres fused in a long stylus ( Fig. 2 ). Maxillary palpus long, one­segmented, apically narrow, with dark bristles, and a small sensorial region ( Fig. 3 ). Proboscis and labella brown. Occiput gray to brown, with iridescent setae.

Thorax brown, mesoscutum darker than scutellum, both with brown bristles. Halteres bare, with brownish stem and yellowish knob. Coxae, femora and tibiae yellowish, with dark setae; tarsi light brown. Wing brownish, with light brownish stripes; pterostigma pigmented, darker than general colour of the wing, long, filling almost entirely cell r 1; setulae on R 1, R 2+3, R 4+5, R 4, R 5, M 1, M 2, CuA, CuA 1 and CuA 2; R 2+3 reaching C beyond R 1, slightly sinuous distally; R 4 forking with almost right angle, a strong sinuosity before margin; M 1+2 after cross­vein m­m; A 1 reduced and strongly curved; cross vein m­m longer than m­cu and r­m; cubital posterior cell widely open; alula absent ( Fig. 4 ).

Abdomen brown, darker than thorax, brown and iridescent hairs along segments. Gonocoxite and gonostyle brown; gonostyle long, rounded distally, bearing a broad knob at mid­outer surface, close to the articulation with the gonocoxites; gonocoxites separated from each other, antero­ventral parts covered by sternum IX ( Fig. 5 ); sternite IX subcircular, margins sclerotized, lateral parts fused to gonocoxites; posterior part of aedeagus relatively long; ventral plate not extending beyond parameres; ejaculatory apodeme very long, exceeding base of gonocoxites; lateral ejaculatory process long, but not as long as ejaculatory apodeme and not exceeding base of gonocoxite; small aedeagal tines, resembling curved rods at a subapical portion of ejaculatory apodeme; gonocoxal apodemes not extended beyond anterior margin of sternite IX; parameral apodemes slender; tergite IX wider than long, subretangular, anterior margin almost straight ( Fig. 6 ); cercus subglobose, with bristles.

FEMALE. Body length 5.5–7.0 mm. Wing length 5.0–6.0 mm. Dichoptic eyes. Head and thorax similar to male; abdomen darker than male, especially segments VII–VIII, but light brown cerci.

Hypogynial valves with six long hairs each ( Fig. 8 ); anterior end of sternite IX accuminated, distal apodemes short ( Fig. 9 ); cercus bisegmented, distal segment subovoid, as long as the proximal segment, a sensorial organ opening apically bearing thick internal setae; proximal segment wide, with pronounced posteroventral lobe ( Figs. 7–8 ).

Geographic distribution Mexico, Reserva de Biosfera ‘El Triunfo’.

Etymology The species name comes from the Latin word caligatus , common soldier, as a reference to the wing brown stripes, resembling a military dress.

Neorhagio nagatomii sp. n.

Figures 10–18

Material

Holotype ♂, MEXICO, Reserva El Triunfo , Sendero Palo Gordo, Jaltenango, 6400m, 15º 39’ 22’’N 92º 48’ 31’’W, 19­22/VII/1997, Malaise trap, A. González, J.B. Wooley, L. Montoya colls. ( MZFC) ; 5 ♂ paratypes, the same as holotype, but 15º 39’ 34’’N 92º 48’ 28’’W ( MZFC) ; 3 ♀ paratypes, the same as holotype ( MZFC).

Diagnosis

Wing hyaline; short pterostigma; setulae on R 1, R 2+3, R 4+5, R 4, R 5, M 1, M 2, and M 3; R 2+3 reaching C far beyond R 1; A 1 curved. Gonostyle distally rounded, outer margin convex, inner margin straight; alula strongly reduced; posterior part of aedeagus short; lateral ejaculatory process as long as ejaculatory apodeme. Distal apodemes of sternite IX in females widely projected.

Description

MALE. Body length 8.0– 8.2 mm. Wing length 7.4–7.6 mm. General color brown. Eyes dichoptic, brown to black, facets homogenous, ocellar tubercle brown with prominent bristles ( Fig. 10 ), ocelli gray to brown. Gena brown, clypeus light brown to yellow, bulbous protruded. Antenna brown, scape lighter than pedicel; scape and pedicel subglobose subequal in size, with long bristles; first flagellomere dark brown, slightly rounded, shorter than scape and pedicel; arista with flagellomeres fused in a long stylus ( Fig. 11 ). Maxillary palpus long, one­segmented, with dark bristles and a wide sensorial region ( Fig. 12 ). Proboscis and labella light brown. Occiput gray to brown, with dark and iridescent setae.

Thorax brown, mesoscutum with brown bristles, scutellum with long dark bristles. Halters bare. Coxae, femora and tibiae yellowish to light brown, with dark setae; tarsi brown. Wing homogeneously hyaline, except for short pigmented pterostigma; setulae on R 1, R 2+3, R 4+5, R 4, R 5, M 1, M 2, and M 3; R 2+3 reaching C far beyond R 1, without distal sinuousity; R 4 forking with almost right angle; A 1 curved; cross vein m­m larger than m­cu and r­m; cubital posterior cell open; alula strongly reduced ( Fig. 13 ).

Abdomen brown, with lighter transversal stripes on all segments. Gonocoxite and gonostyle brown; gonostyle distally rounded, outer margin convex, inner margin straight; gonocoxites separated from each other, antero­ventral end covered by sternite IX ( Fig. 14 ); sternite IX semitriangular, margins sclerotized, proximal margin slightly curved and lateral parts fused to gonocoxites; posterior part of aedeagus short; ventral plate extending beyond parameres, with prominent antero­lateral projections; ejaculatory apodeme long, exceeding base of gonocoxites; lateral ejaculatory process as long as ejaculatory apodeme; small aedeagal tines, resembling curved rods at a subapical swelling on ejaculatory apodeme; gonocoxal apodemes wide, not clearly extended beyond anterior margin of sternite IX; parameral apodemes slender and long; tergite IX slightly wider than long, anterior margin with shallow concavity ( Fig. 15 ); cercus wider than long, subglobose, with long bristles and a sensorial organ open apically with internal setae.

FEMALE. Body length 6.5–7.5 mm. Wing length 7.5–7.8 mm. Dichoptic eyes. Mesoscutum and abdomen slightly darker than male. Segments VIII–IX darker than cerci.

Hypogynial valves with nine long hairs each ( Fig.17 ); anterior end of sternite IX rounded, distal apodemes wide projected ( Fig. 18 ); cercus light brown, bisegmented, distal segment subovoid, apical sensorial region with thick setae; pronounced posteroventral lobe in proximal segment ( Figs. 16–17 ).

Geographic distribution Mexico, Reserva Biosfera ‘El Triunfo’.

Etymology

The species is named in homage to the Japanese entomologist Dr. Akira Nagatomi, an eminent dipterist with an important contribution to the understanding of the families of Brachycera.

Figures

FIGURES 1–4. Neorhagio caligatus sp. n., 1 — ♂ head, frontal view, 2 — Antenna, 3 — Maxillary palpus, 4 — Wing. Scale line: 0.1 mm.

FIGURES 5–9. Neorhagio caligatus sp. n., ♂: 5 — Hypopygium, ventral view, 6 — Epandrium, dorsal view, ♀: 7 — Epigynum, lateral view, 8 — Epigynum, ventral view, 9 — Genital fork (s IX). Scale line: 0.05 mm.

FIGURES 10–13. Neorhagio nagatomii sp. n., 10 — ♂ head, lateral view, 11 — Antenna, 12 — Maxillary palpus, 13 Wing. Scale line: 0.1 mm.

FIGURES 14–18. Neorhagio nagatomii sp. n., ♂: 14 — Hypopygium, ventral view, 15 — E pandrium, dorsal view, ♀: 16 — Epigynum, lateral view, 17 — Epigynum, ventral view, 18 — Genital fork (s IX). Scale line: 0.05 mm.