Lysilinga occipitalis (Adams)

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 : 226-228

Lysilinga occipitalis (Adams)

( Figs. 367, 377, 387, 397, 407, 417, 427, 437, 445, 449)

occipitalis Adams (1904:443 orig. desc.), Cole (1923a: 35 male key) ( Psilocephala ); Irwin and Lyneborg (1981a:232 comb. change) ( Lysilinga ). Type locality United States, Arizona, Bill Williams Fork. Holotype in SEMC.

subrufa Cole (1923a: 37 fem. key, 68 orig. desc.) ( Psilocephala ); Irwin and Lyneborg (1981a:232 comb. change) ( Lysilinga ). Type locality Superstition Mount, Highley, Arizona. Holotype female in United States Biological Survey (USNM). New Synonym.

The holotype female of Psilocephala subrufa Cole was determined to be conspecific with Lysilinga occipitalis based on the dark yellow occipital, postocular, thoracic, and coxal macrosetae and the large, dark brown area dorsolaterally on the frons.

Diagnosis

Lysilinga occipitalis is taxonomically associated with L. aurantiaca in lacking setae on the katepisternum and in having the abdomen yellowish orange or at least tergites 2–4 orange. Lysilinga occipitalis differs from L. aurantiaca in having the occipital, postocular, thoracic, and coxal macrosetae yellowish brown and the female frons with a large dark brown area dorsolaterally.

Redescription of male

Variation (n=10).

Body Length 6.5–7.7, 7.2 mm.

Head. Ommatidia smaller ventrally and laterally. Frons silver with small brown area dorsolaterally along margin of eye; setae brown, short. Antenna yellow, flagellomeres 2–3 dark brown; setae on scape dark brown, short. Parafacial pruinescence silver. Maxillary palpus yellow; setae yellow. Genal setae white. Occipital setae white, absent dorsally, macrosetae yellowish brown. Postocular macrosetae yellowish brown.

Thorax. Macrosetae yellowish brown, 3 np, 2 sa, 1 pa, 0 dc, 2 sc. Mesonotum dull yellowish gray; setae yellow, elongate intermixed with scattered dark brown setae. Pleuron pruinescence silver; setae white on propleuron, anepisternum, laterotergite, and metanepisternum, yellow appressed on scutellum, absent on katepisternum. Wing. Membrane pale brown, veins yellowish brown; pterostigma indistinct; cell m 3 closed at wing margin. Halter yellow. Legs. Coxal macrosetae yellowish brown. Femora yellow; ventral setae absent; av 0–2:0:2–4, pv 0:0:1–3. Tibiae yellowish brown, apex of hind tibia reddish brown. Tarsomeres 1–2 dark yellowish brown; 3–5 brown.

Abdomen. Yellowish orange, glossy; setae pale gold, elongate, appressed. Terminalia (MEI 078710) yellow. Tergite 8 and epandrium ( Fig. 367), setae dark brown. Hypoproct ( Fig. 367) quadrate, posterior margin truncate, ending distal to apex of cercus. Gonocoxite ventral view (Fig. 377), basal three­fourths quadrate rounded laterally, medial margin sinuate, posteromedial lobe small, pointed, then tapering apically to thick point, setae yellow with small patch of setae posteromedially; dorsal view ( Fig. 387) gonocoxal bridge small; lateral view (Fig. 397) rectangular, tapering apically to broad almost truncate margin with area of fine short spines on inner surface; ventral lobe (Fig. 377) with ventral spines. Gonostylus ( Fig. 407), basodorsal lobe absent; ventral margin rounded, setae dark yellow; fine, short spines absent laterally. Aedeagus with dorsal apodeme (Fig. 417) broad, rectangular, sides sinuate, posterolateral margin expanded, pointed; ventral apodeme ( Fig. 427) thick, tapered anteriorly, extending to anterior margin of dorsal apodeme; distiphallus dorsal view (Fig. 417) short, broad basally, tapering apically with subapical lateral expansion and median carina, lateral view (Fig. 437), apical half recurved apically, subapical hood curved ventrally, pointed apically; ejaculatory apodeme (Fig. 417), anterior half expanded laterally, not extending to anterior margin of dorsal apodeme, anterior margin emarginate, in cross­section flattened dorsoventrally.

Female

Similar to male except for following.

Variation (n=10).

Body length 6.3–8.8, 7.4 mm.

Head. Frons dark yellow, silver ventrally with large dark brown area dorsolaterally, grayish black ventral to brown area; setae dark reddish brown.

Thorax. Macrosetae 3 np, 1–2 sa, 1 pa, 0 dc, 2 sc. Legs. Anteroventral macrosetae 1–2:0:2–5, pv 0:0:1–3.

Abdomen. Yellowish orange, glossy, tergites 2–3 with posterolateral dark brown area followed by white pruinescent area, tergites 4 and 6 with anterolateral dark brown area, tergite 5 with anterolateral dark brown area and posterolateral white pruinescent area, tergite 7 with narrow, dark brown band across posterior margin; dorsal setae yellow, appressed on tergite 1–3 with white appressed setae across posterior margin, yellow on tergite 4 intermixed with appressed dark reddish brown setae, dark reddish brown on tergites 5–7; lateral setae pale yellow on tergites 1–3, dark reddish brown on tergites 4–7. Terminalia (MEI 078465). Furca ( Fig. 445) quadrate; length 0.32 mm, width 0.30 mm; posteromedial lobe large, cone­shaped; anterolateral and anteromedial projections absent. Common duct ( Fig. 445) longer than furca. Spermathecal ducts directed anteriorly ( Fig. 445).

Distribution

Lysilinga occipitalis ranges from western Texas north to Utah and west to southern California and northern Mexico with a single male collected in Missouri [possibly mislabeled?] ( Fig. 449).

Habitats and phenology

Adults of Lysilinga occipitalis have been handnetted on Sapindus sp. and an orchidaceous legume tree, as well as collected at ultraviolet and argon light traps. Specimens have been collected from 4 April to 18 August.

Specimens examined

Type specimens. The holotype male of Lysilinga occipitalis Adams is labeled "Bill Williams Fork, Arizona " and is in the SEMC. The holotype female of Psilocephala subrufa Cole is labeled "Superstition Mount, Highley, Arizona on June 13, E. G. Holt" and is in the USNM ( United States Biological Survey). Other specimens. MEXICO. CHIHUAHUA. Samalayuca [31.333, ­106.474], 24.VI.1947, Cazier, 1♀ MEI 141715 (AMNH). UNITED STATES. ARIZONA. Turkey Creek, 10.VI.1933, Beamer, R. H., 1♂ MEI 080325 (SEMC). Cochise County: 1.6 km SE Dos Cabezas [32.165, ­109.603], 4.IV.1989, Barr, W. F., 1♂ MEI 079593 (WFBM), Sapindus sp. ; 4 km SW Benson, Section 20 [31.939, ­110.32], 3.VI.1991, Maier, C. T., 1♂ MEI 078707 (CAES); 4.VI.1991, Davis Jr., L. R., 1♂ MEI 128581 (FSCA); Maier, C. T., 2♂ MEI 078709–10, 2♀ MEI 078711–12 (CAES), ultraviolet light; Portal [31.914, ­109.141], 15.VI.1964, Raske, A. G., 1♂ MEI 141708 (MEIC). Graham County: Thatcher [32.85, ­109.76], 20.VI.1950, Taylor, E. J., 1♂ MEI 141703 (EMEC). Mohave County: Mohave Valley [35.119, ­114.621], 8.V.1980, Artz, P., Butler, G., 2♂ MEI 078464, 078466, 2♀ 078463, 078465 (UAIC). Pima County: 12.9 km N Vail [32.048, ­110.711], 30.V.1968, Werner, F., 2♂ MEI 078467–8, 1♀ 078475 (UAIC), ultraviolet light; Santa Catalina Mountains, Sabino Canyon [32.328, ­110.801], 6.VI.1952, Cazier, M., Gertsch, W., Schrammel, R., 1♀ MEI 141716 (AMNH); Tucson [32.222, ­110.926], 16.VI.1979, Werner, F. G., 1♀ MEI 078469 (UAIC), flight trap; 732–792 m, 19.VI.1976, Olson, C., 1♂ MEI 078462 (UAIC); 26–28.V.1979, Werner, F. G., 1♂ MEI 078474, 1♀ 078470 (UAIC), flight trap; 29.V.1979, 1♂ MEI 078473 (UAIC), flight trap. Pinal County: Superior, Boyce Thomp. Arbor [33.294, ­111.096], 19.VI.1957, Werner, F., Butler, G., 1♀ MEI 148040 (UAIC); 4.VI.1962, Werner, F., Bequaert, J., 1♂ MEI 141707, 1♀ 078472 (UAIC). Yuma County: Parker [34.297, ­114.139], 30.VII.1980, Whitlow, M., Butler, G., 1♀ MEI 078471 (UAIC), flight trap. CALIFORNIA. Riverside County: Blythe [33.61, ­114.596], 8.VIII.1962, Hardman, R. M., 1♀ MEI 072238 (CSCA); 31.VIII.1962, 1♀ MEI 072239 (CSCA); Cathedral City [33.78, ­116.46], 18.VIII.1950, Isaak, L. W., 1♂ MEI 147263 (MEIC); Coachella [33.68, ­116.173], 10.VIII.1962, Bascom, L.A., 1♂ MEI 072240 (MEIC); Thermal [33.64, ­116.139], 23.VIII.1962, 1♂ MEI 072671 (CSCA), argon light trap. MISSOURI. Hickory County: Hermitage [37.941, ­93.316], 19.VI.1960, Harmston, F. C., 1♂ MEI 128575 (FSCA) [this specimen is well outside of the expected distribution of occipitalis ]. NEW MEXICO. Dona Ana County: Las Cruces [32.312, ­106.778], –1895, 1♂ MEI 113322 (USNM), 2.VI.1965, Bohart, R. M., 1♂ MEI 141696 (UCD), orchidaceous legume tree. Luna County: Pancho Villa State Park, Columbus [31.823, ­107.641], 1237 m, 29.VI.1997, Metz, M. A., 1♂ MEI 113899 (MEIC). TEXAS. El Paso County: El Paso, –. VII.1958, Thompson, G. A., 2♂ MEI 113323–4 (USNM). UTAH. Washington County: Lytle Ranch Pres., Beaver Dam wash [37, ­113.996], 10.24. VI.1987, Hanson, W. J., 1♂ MEI 072701 (INHS), 2♀ 072700 (INHS), 072703 (MEIC); St. George [37.104, ­113.583], 29.V.1919, MEI 113325 (USNM).