Lysilinga chamela Webb, 2006

Webb, Donald W. & Metz, Mark A., 2006, A Revision of the New World Genera Brachylinga Irwin and Lyneborg and Lysilinga Irwin and Lyneborg (Diptera: Therevidae: Therevinae) with the Description of a New Genus, Elcaribe Webb, Zootaxa 1288 (1288), pp. 1-241 : 215-217

Lysilinga chamela Webb spec. nov.

( Figs. 362, 372, 382, 392, 402, 412, 422, 432, 442, 448)

Etymology

This name is used as a noun in apposition and refers to Chemala, Mexico, the area from which many of the specimens have been collected.

Diagnosis

Lysilinga chamela is taxonomically associated to L. digita in lacking setae on the katepisternum; in having the abdomen dark reddish brown; in having the halter knob dark brown; the dorsocentral macrosetae absent; the hypoproct quadrate ( Fig. 362); the male frons lacking setae; the anterior half of the male ejaculatory apodeme broadly expanded laterally and flattened dorsoventrally in cross­section (Fig. 412); and the female abdomen dark reddish brown, glossy with pruinescence gray on the posterolateral area of tergites 2–3, and gray laterally on tergites 5–6. Lysilinga chamela differs from L. digita in having the gonocoxite in lateral view (Fig. 392) rectangular with the apex rounded and the distiphallus (Fig. 412) tapered apically.

Description of holotype male (MEI 077764)

Body length 5.5 mm.

Head. Length 0.70 mm. Ommatidia of homogeneous size. Frons pruinescence gray; setae absent. Antenna/head length 0.78; dark brown, pruinescence gray, basal half of first flagellomere dark yellow; scape length 0.18 mm, width 0.09 mm, length/width 2.0, scape/ pedicel length 2.6, scape/flagellum width 0.56, setae black, short; pedicel length 0.07 mm, length/width 0.7; first flagellomere oval, attenuate apically, flagellum length 0.31 mm, width 0.16 mm, length/width 1.9, flagellum/scape length 1.7. Parafacial pruinescence gray. Maxillary palpus dark yellowish brown; length 0.22 mm, length/width 5.5; setae yellow. Genal setae white. Occipital setae white ventrally becoming pale gold, lanceolate, appressed dorsally. Postocular macrosetae dark reddish brown.

Thorax. Macrosetae dark reddish brown, 3 np, 2 sa, 1 pa, 0 dc, 2 sc. Mesonotum dull black, pruinescence gray; setae black, elongate intermixed with polychromatic, lanceolate, appressed setae. Pleuron pruinescence gray; setae white on propleuron, anepisternum, laterotergite, metanepisternum, scutellum, absent on katepisternum. Wing. Membrane pale smoky brown, slightly darker apically; veins dark yellowish brown; length 3.7 mm, length/ width 2.8; pterostigma brown; cell m 3 open. Halter dark brown. Legs. Coxal macrosetae dark reddish brown. Femur dark yellow, glossy; ventral setae white on fore­ and midfemora, dark reddish brown setae apicoventrally on forefemur; av 1:0:2, pv 0:0:7. Tibiae dark yellow, glossy. Tarsomere 1 dark yellow, 2–5 brown.

Abdomen. Dark reddish brown, glossy, pruinescence white on posterolateral areas; dorsal setae dark reddish brown on dark reddish brown areas, white, elongate, appressed in narrow band across posterior margin; lateral setae white, elongate. Terminalia (MEI 103360) brown. Tergite 8 and epandrium ( Fig. 362), setae dark reddish brown. Hypoproct ( Fig. 362) quadrate, apex truncate, ending distal to apex of cercus; setae dark reddish brown. Gonocoxite ventral view (Fig. 372), basal half quadrate, medial margin with posteromedial lobe, then margin becomes emarginate before tapering apically to attenuate projection, setae dark reddish brown; dorsal view ( Fig. 382) gonocoxal bridge small; lateral view (Fig. 392) oblong, tapering apically to rounded apex with sharp angulate point ventromedially; ventral lobe lacking spines. Gonostylus ( Fig. 402), basodorsal lobe absent; ventral margin sinuate, setae dark yellow; fine, short spines laterally. Aedeagus with dorsal apodeme (Fig. 412) quadrate, posterolateral margin expanded; ventral apodeme ( Fig. 422) narrow, tapered to point anteriorly, extending beyond anterior margin of dorsal apodeme; distiphallus dorsal view (Fig. 412) broad basally, tapered apically, lateral view (Fig. 432), apical half sinuate, recurved apically, subapical hood attenuate; ejaculatory apodeme (Fig. 412), anterior half broadly expanded laterally, extending beyond anterior margin of dorsal apodeme, anterior margin truncate, in cross­section flattened dorsoventrally.

Variation (n=10). Body length 5.2–6.5, 5.6 mm. Thorax. Macrosetae 3 np, 2 sa, 1 pa, 0 dc, 2 sc. Legs. Anteroventral macrosetae 1–2:0:1–4, pv 0:0:3–7.

Female

Similar to male except for following.

Variation (n=9).

Body length 5.3–6.3, 5.7 mm.

Head. Frons yellowish brown, silver ventrally with small, brown area dorsolaterally; setae dark brown.

Thorax. Macrosetae 3 np, 2 sa, 1 pa, 0 dc, 2 sc. Legs. Anteroventral macrosetae 1:0:2–4, pv 0:0:4–7.

Abdomen. Dark reddish brown, glossy, posterolateral areas of tergites 2–3, pruinescence gray, tergite 5–6 with pruinescence gray laterally; dorsal setae dark reddish brown on dark reddish brown areas and white, elongate, appressed in narrow band across posterior margin of tergite 1; lateral setae dark reddish brown. Terminalia (MEI 077780). Furca ( Fig. 442) oval; length 0.32 mm, width 0.28 mm; posteromedial lobe large; anterolateral and anteromedial projection absent. Common duct ( Fig. 442) shorter than furca.

Distribution Lysilinga chamela is known from Mexico ( Fig. 448).

Habitats and phenology

Adults of Lysilinga chamela have been handnetted and collected in Malaise traps from 23 March to 12 June.

Specimens examined

Type specimen. The holotype male of Lysilinga chamela Webb (MEI 077764) is labeled " MEXICO: Jalisco, Est. Biol. Chamela, 2–VI–1988, E. Ramirez" and is deposited in UNAM. PARATYPES. MEXICO. JALISCO. Estación de Biologia Chamela [19.61, ­ 105.05], 2–VI–1988, E. Ramírez , 6♂ MEI 077763–4, 077766, 077770, 077773, 077778, 3♀ 077762, 077776, 077780 ( UNAM) ; 4♂ MEI 103364–5, 103365, 103368, 1♀, 103372 ( EBCC) , Malaise trap; 3.VI.1988, 8♂ MEI 077765, 077767–8, 077771–2, 077775, 077779, 077782, 1♀ 077774 ( UNAM) , Malaise trap; 5.V.1988, 1♀, MEI 077781, ( UNAM) ; 5.VI.1989, 3♂ MEI 103360, 103366–7 ( UNAM) ; 11.VI.1988, 2♂ MEI 103361 ( INHS) , 103362 (USNM), 3♀ 103370 ( INHS) , 103371 (USNM), 103373 (MEIC); 12.VI.1989, 1♂ MEI 103363 ( MEIC) ; 13.V.1986, M. Sánchez , 1♂, MEI 141821, ( EMUS) . MORELOS. 4.8 km N Alpuyeca [18.733, ­99.31], 1036 m , 23.III.1959, H. E. Evans , 1♂, MEI 088460, ( CUIC) .