Arenigena bajaensis Webb, 2009

Webb, Donald W., 2009, A revision of the genera Acrosathe Irwin and Lyneborg, Arenigena Irwin and Lyneborg, and Litolinga Irwin and Lyneborg (Diptera: Therevidae: Therevinae) from the Nearctic Region, Zootaxa 2091 (1), pp. 1-67 : 41-44

Arenigena bajaensis Webb spec. nov.

(Figs. 64–71, 96)

Etymology. Ensis (Latin) = a suffix denoting place, locality, or country. This name refers to the State of Baja California de Norte, Mexico.

FIGURES 64–71. Arenigena bajaensis . 64. Tergite 8, epandrium, cerci. 65. Sternite 8, gonocoxite ventral view. 66. Gonocoxite, lateral view. 67. Gonostylus lateral view. 68. Aedeagus, dorsal view. 69. Aedeagus, ventral view. 70. Aedeagus, lateral view. 71. Female internal reproductive organs. Scale = 0.1 mm.

Diagnosis. Arenigena bajaensis is similar to A. marcida in having the inner gonocoxal process (Fig. 66) narrow, elongate and the distiphallus (Fig. 70) thick basally and broadly curved posteroventrally. It differs from A. marcida in the male frons being setose, the male dorsal apodeme (Fig. 68) being slightly expanded laterally, and the female frons with white setae admixed with thicker dark brown setae dorsolaterally; and the furca (Fig. 71) with a broad anterior projection.

Description of MALE. Variation (n=10).

Body length 6.2–8.6, 7.6 mm.

Head. Length 0.68–1.20, 0.96 mm. Ocellar tubercle dark reddish brown, pubescence gray; setae dark brown, elongate. Frons pubescence white to gold, dense; setae white to pale yellow. Antenna whitish yellow, second and third flagellomeres dark brown; antenna/head length 0.51–0.82, 0.63; scape length 0.14–0.20, 0.16 mm, width 0.12–0.14, 0.13 mm, length/width 1.0–1.7, 1.3, scape/pedicel length 1.8–2.5, 2.0, scape/ flagellum width 0.7–1.0, 0.8, setae white to pale yellow, elongate; pedicel length 0.08 mm, width 0.12–0.14, 0.13 mm, length/width 0.6–0.7, 0.6; flagellum (considerable variation was noted in the length of the narrow cylindrical portion of the first flagellomere), length 0.30–0.38, 0.35 mm, width 0.12–0.18, 0.17 mm, length/ width 1.7–2.8, 2.1, flagellum/scape length 1.7–2.6, 2.2. Parafacial pubescence white to gold. Gena slightly expanded ventrally, pubescence white; setae white, elongate. Maxillary palpus yellow; length 0.38–0.48, 0.44 mm, width 0.06–0.08, 0.07 mm, length/width 5.5–7.0, 6.0; setae white to pale yellow, elongate. Occipital setae white, elongate becoming sparse dorsally.

Thorax. Macrosetae 2–3 np, 1–2 sa, 1–2 dc. Mesonotum with vittae dull brown separate by gray pubescence; setae white, elongate. Pleuron pubescence gray, dense; setae white, elongate on propleuron, anepisternum, katepisternum (setae generally sparse, arranged in an anterodorsal or mediodorsal patch), laterotergite, metanepisternum, and scutellum; absent on proepimeron. Wing. Membrane pale whitish gray, veins and cross-veins brown with narrow, brown margin on humeral cross-vein, along R 2+3 and R 4+5, at fork of R 4+5, r-m, apex of discal cell, apex of cell bm, along M 1, M 2, M 3, M 3 +CuA 1, CuA 1, at apex of cup; length 4.7–6.0, 5.4 mm, width 1.3–2.0, 1.8 mm, length/width 2.7–3.6, 3.0; pterostigma dark brown. Legs. Coxae pubescence white, dense; setae white, elongate. Femora dark reddish brown, pubescence white; ventral setae white, elongate, dorsal setae white, appressed. Tibiae yellowish brown, apex dark brown. Tarsi dark brown.

Abdomen. Pubescence white, dense; dorsal setae white, elongate, erect, abundant; lateral setae white, elongate. Terminalia (MEI 073709) brown. Tergite 8 (Fig. 64), setae yellow. Sternite 8 (Fig. 65), rectangular, sides rounded, posterior margin slightly emarginate; setae pale yellow, separated medially on posterior margin. Epandrium (Fig. 64) quadrate; posterolateral margin short, pointed; setae yellow. Hypoproct (Fig. 64), posterior margin emarginate. Gonocoxite ventral view (Fig. 65) quadrate, posterior margin rounded; lateral view (Fig. 66), globular, posterior margin rounded, inner gonocoxal process narrow, cylindrical. Gonostylus view (Fig. 67), cylindrical, sinuate; setae yellow. Aedeagus with dorsal apodeme (Fig. 68) broad, expanded laterally, anterior margin truncate; ventral apodeme (Fig. 69), broad, short; distiphallus dorsal view (Fig. 68) narrow; lateral view (Fig. 70) narrow basally, extending posteriorly in broad curve; ejaculatory apodeme (Figs. 68–69) not reaching anterior margin of dorsal apodeme.

FEMALE. Similar to male except for following. Variation (n=10).

Body length 8.0–9.3, 8.6 mm.

Head. Length 0.92–1.22, 1.04 mm. Frons pubescence white, dense to pale brownish gray dorsally; setae white, appressed with thicker dark brown setae dorsolaterally. Antenna/head length 0.6–0.7, 0.6; scape length 0.14–0.22, 0.18 mm, width 0.12–0.18, 0.15 mm, length/width 1.0–1.5, 1.2, scape/pedicel length 1.8–2.5, 2.1, scape/flagellum width 0.7–1.0, 0.9; pedicel length 0.08–0.10, 0.09 mm, width 0.16 mm, length/width 0.5–0.6, 0.5; flagellum length 0.30–0.46, 0.39 mm, width 0.16–0.20, 0.18 mm, length/width 1.8–2.6, 2.2, flagellum/ scape length 1.8–3.7, 2.2. Maxillary palpus length 0.34–0.50, 0.45 mm, width 0.06–0.08, 0.08 mm, length/ width 5.0–6.0, 5.6. Gena expanded ventrally with dark brown to black area anteroventrally.

Thorax. Macrosetae 2–4 np, 1–2 sa, 1–2 dc. Wing. Length 5.2–7.2, 6.0 mm, width 1.7–2.4, 2.1 mm, length/width 2.6–3.2, 2.9.

Abdomen. Dark brown, pubescence white, dense; dorsal setae white appressed over entire abdomen. Terminalia (MEI 109200). Furca (Fig. 71) oval; length 0.58 mm, width 0.40 mm; anterolateral projection absent; anterior margin with a broad, expanded flange.

Immature stages. Unknown.

Distribution. Arenigena bajaensis is known from Baja California, Mexico ( Fig. 96 ).

Habitats and Phenology. Arenigena bajaensis has been hand-netted on sand or collected at black and white lights. Adults have been collected from January through April, June through August, and October through November.

Specimens examined. Type specimens. The holotype male of Arenigena bajaensis Webb (MEI 109251) is labeled " MEX. BajaCalif N., 3 mi NW Camalú, 29-III-1970, E. M, & J. L. Fisher" and is deposited in the CAS (Type No. 18393), on permanent loan from UCR. PARATYPES. MEXICO. BAJA CALIFORNIA NORTE. 35.4 km S Rosarito , 2.VII.1973, Fisher, Westcott, 1♀ MEI 109190 ( UCR) ; 5.VII.1973, 1♂ MEI 109199 ( UCR) ; 30 km S Rosarito [28.37, -114.02], 13.IV.1977, Fisher, E.M., 1♂ MEI 109205 ( UCR) ; 20 km N El Rosario, Arroyo Hondo [30.252, -115.78], 29.IV.1983, Wasbauer, M., 2♂ MEI 073077, 073079 ( CSCA) ; Isla San Martin [30.5, -116.117], 30.VI.1983, Faulkner, D., 2♂ MEI 109276 ( USNM) , 109283 (SDMC), 2♀ 109263 ( USNM) , 109281 (SDMC); 0.8 km N El Socorro, Highway 1 [30.33, -115.81], 20.III.1986, Faulkner, Bloomfield, 1♂ MEI 109279 ( SDMC) ; 11.3 km N San Felipe [31.13, -114.853], 8.X.1973, Fisher, E.M., 1♂ MEI 109258 ( UCR) ; 16.1 km SE El Rosario [29.97, -115.667], 31.III.1976, Doyen, J., Rude, P., Morrison, R., 1♂ MEI 109269 ( EMEC) , black and white lights; 16.1–19.3 km ESE El Rosario [30.017, -115.635], 17.III.1984, Pulawski, W.J., 1♀ MEI 156346 ( CAS) ; 20.9 km S Rosarito [28.633, -114.05], 2.VII.1973, Fisher, E.M., 1♂ MEI 109204 ( UCR) ; 3.2 km S Mezquital [Rancho Mezquital ] [32.497, -114.89], 10.X.1972, Fisher, E.M., Fisher, J.L., 1♂ MEI 109198 ( INHS) ; 33.8 km NW Mezquital [Rancho Mezquital ] [32.712, - 115.105], 14–15.VI.1967, Sleeper, E.L., Fisher, E.M., 1♂ MEI 111984 ( CAS) ; 4.8 km N Camalú [30.893, - 116.067], 29.III.1970, Fisher, E.M., Fisher, J.L., 4♂ MEI 109245, 109249 ( INHS) , 109242–3 (UCR); 7.9 km S Santa Maria, Highway 1 [30.279, -115.82], 7.IV.1985, Bloomfield, Faulkner, 5 ♂ MEI 109210–1 ( INHS) , 109272, 109282, 109288 (SDMC); 70 km S Rosarito [28.01, -114.02], 13.IV.1977, Fisher, E.M., 1♀ MEI 109192 ( INHS) , sand dunes; 9.7 km NW El Rosario, near El Consuelo [30.15, -115.783], 18.IV.1965, Cavagnaro, D.Q., Ross, C.E., Ross, E.S., Vesterby, V.L., 1♂ MEI 156354 ( CAS) ; Bahia Santa Rosalillita , 10.5 km SE Campo Santa Rosalillita [28.603, -114.163], 25.III.1970, Fisher, E.M., Fisher, J.L., 1♂ MEI 109244 ( UCR) , 1♀ 109238 ( SDMC) ; Millerís Landing [28.45, -114.04], 6.IV.1976, Doyen, J.T., 1♂ MEI 114105 ( EMEC) , on sand; Rancho Santa Inez [29.69, -114.68], 3.IV.1981, Werner, Olson; Hetz, Thomas, Hurne, 1♂ MEI 078485 ( MEIC) ; ruins of Santo Domingo [30.716, -115.936], 3–4.VIII.1979, Faulkner; Brown, 1♂ MEI 109235 ( SDMC) ; 9.7 km N San Borja , [28.831, -113.851], 13.X.1981, Andrews, F., Faulkner, D. 1♂ MEI 109236 ( SDMC) . BAJA CALIFORNIA SUR. San Carlos, [23.35, -110.15], 9.VI.1975, Evans, H.R., 1♂ MEI 109285 ( UCR) ; 20.9 km SW Guillermo Prieto , 3–5.IV.1982, Wasbauer, M., Wasbauer, K., 1♂ MEI 073068 ( CSCA) ; 5.8 km S San Juanico [26.368, -111.48], 30.III.1985, Bloomfield, Faulkner, 1♀ MEI 109200 ( SDMC) ; 64.4 km W San Ignacio [27.3, -113.479], 23.II.1974, Bohart, G.E., 1♀ MEI 007653 ( EMUS) ; 7 km W Cabo San Lucas, Cabo Falso [22.896, -109.966], 1.I.1979, Rude, P., 1♂ MEI 082072 ( EMEC) , on sand dune; 95 km NW La Paz [24.747, -110.919], 183m, 24–25.XI.1968, Sleeper, E.L., 1♀ MEI 111991 ( CAS) ; 29 km W La Paz , [24.14, -110.31], 244m, 7.X.1968, Sleeper, E.L., Moore, F.J., 1♂ MEI 112036 ( CAS) , blacklight; San Jorge [25.73, -112.07], 23.VI.1967, Sleeper, E.L., Fisher, E.M., 1♀ MEI 111983 ( INHS) ; 3.2 km S Todos Santos , [23.42, -110.239], 16.X.1964, Sleeper, E.L., 2♂ MEI 112004, 112008 ( CAS) ; San Carlos, [23.35, -110.15], 25.IX.1981, Faulkner, D., Andrews, F., 1♂ MEI 109234 ( SDMC) ; 23 km W La Paz , [24.14, -110.517], 24.IV.-27.IV.1975, Fisher, E.M., Fisher, J.L., 1♂ MEI 109197 ( UCR) ;

Figures

FIGURE 96–97. Distribution map. 96. Arenigena bajaensis, open circle, Ar. semitaria closed circle. 97. Arenigena marcida closed circle, Litolinga acuta open circle.