Haromyia iviei Runyon

Runyon, Justin B., 2015, Haromyia, a new genus of long-legged flies from Dominica (Diptera: Dolichopodidae), Zootaxa 3964 (5), pp. 589-595 : 590-594

Haromyia iviei Runyon sp. nov.

Description. Male. Small yellow and brown species, body length: 1.3 mm, wing length: 1.2 mm. Habitus ( Fig. 1 ). Head: dark brown with sparse gray-silver pruinescence. Face dark brown, wide, broadest at antenna and narrowing slightly to clypeus; clypeus parallel-sided, somewhat bulbous, usually more yellow in color, bearing 6 large black setae in 2 rows (largest setae subequal in size to dorsocentral setae) ( Figs 1 , 3 ). Dorsal postcranium strongly concave. Eyes with short hairs between facets (ommatrichia). Vertical setae large, not on elevation or tubercle; paravertical setae half size of vertical setae; ocellar setae divergent, subequal in size to vertical setae; postocellar setae half size of paravertical setae. Postocular setae sparse, in single row, dorsal-most 4–5 black, thicker, remaining ventral about 10 setae more slender, hair-like, brown. Ventral postcranial hairs (beard) and gena absent. Palpus small, ovate, not ornamented, dark brown with some gray-silver pruinescence, with small hairs and large black seta near apex. Proboscis brown to yellow with silver-gray pruinescence, not ornamented, somewhat sclerotized, shiny, with short brown hairs near apex; each labellar lobe with 6 geminately sclerotized pseudotracheae. Antenna ( Fig. 3 ) with all segments short, scape yellow, without dorsal setae; pedicel yellow, rather round, slightly projecting on inner side, with apical ring of setulae; first flagellomere brown, globular, kidneyshaped in lateral view and nearly round in anterior view, arista apical, very long (length twice height of head), with short but evident setulae. Thorax: yellow, scutum with only slightly flattened posterior slope. Setae of thorax black; 5 dorsocentral setae; approximately 10 small acrostichal setae in 2 rows; 2 notopleural setae; 1 humeral seta and usually 1 or more very small hairs; 1 presutural, 1 sutural, and 1 postsutural intra-alar setae; 1 presutural and 1 postsutural supra-alar setae; 1 large postalar seta; scutellum with 1 large marginal seta and one very small lateral hair per side; lower proepisternum with 1 large seta, upper proepisternum with 1 small seta (<half size of larger seta), no additional hairs. Pleura yellow with black small area (katatergite) in front of halter. Legs: yellow, becoming slightly brownish distally, not ornamented ( Figs 1 , 2). Coxae concolorous with pleura. Coxa I with rather sparse black anterior hairs, longer setae at apex and longer anterodorsal seta near 2/3. Coxa II with black anterodorsal seta near 1/2 and black setae along apex. Coxa III with black lateral seta near 1/2. Femora II and III with anterior preapical setae ( Fig. 1 ). Tibia I without noticeable setae. Tibia II with anterodorsal seta near 1/3, smaller posterodorsal seta near 1/3, and normal ring of setae at apex. Tibia III with anterodorsal seta near 1/3, 3–4 posterodorsal setae scattered along length of tibia, and 2–3 setae at or near apex. First tarsomere of leg III short, less than half length of second tarsomere, ventrally with ring of setulae near apex and 1–2 short but noticeable setae. Approximate ratios of tibia:tarsomeres for leg I: 6–3–2–2–1–1; for leg II: 7–4–2–2–1–1; for leg III: 9–2–5– 3–2–1. Wing ( Fig. 4 ): hyaline, evenly rounded, with veins R1, R2+3, R4+5, M1, and CuA1 nearly straight and evenly diverging for most of their lengths; vein R2+3 slightly bent anteriorly near apex; vein M without evident bosse alaire, slight flexion and wing indentation typically on vein M distal to crossvein dm-cu, present in many dolichopodids; crossvein dm-cu about half as long as last part of CuA1. Vein A1 absent. Calypter small, yellow-brown with a few very short brown setae. Abdomen: brown with intersegmental membranes yellow, with black setae, 6 setose tergites visible, with apex rather abruptly narrowed and capped by hypopygium. Hypopygium ( Fig. 5 ) somewhat bulbous, not pedunculate; epandrium longer than wide, asymmetrical in ventral view, apically with ventral and dorsal lobes bearing setae; hypopygial foramen left lateral, placed rather far posteriorly; hypandrium ( Fig. 5 B) partially fused to base of epandrium, nearly symmetrical, slightly offset to left to accommodate phallus; surstylus small, attached to apex of epandrium, with 2 slender lobes bearing setae; with thin, bilobed inner appendage ( Fig. 5 C), symmetrical, placed immediately below cerci and associated with subepandrial sclerite (latter could be hypoproct or postgonites); phallus simple, noticeably sinuous on apical third. Female. Habitus ( Fig. 2). Body length 1.2–1.4 mm, wing length 1.3 mm. Setae on clypeus, antenna, thorax, legs, and wings as in male. Abdomen pale yellow except terga 1 and 5 and sternite 5 which are brown ( Fig. 2). Acanthophorites of terminalia with approximately 6 strong spines.

Etymology. This species is named for the distinguished coleopterist Dr. Michael Ivie ( Montana State University) who provided the only known specimens of this interesting species.

Type material. HOLOTYPE ♂, DOMINICA: St. David Parish, ca. 1 km NE Ponte Casse, Waitukubuli National Trail, 15.381490º N, 61.340138º W, 31MAY-05 JUNE 2011, malaise over dead tree. Deposited: National Museum of Natural History, Smithsonian Institution, Washington, D.C. ( USNM). PARATYPES: 2 ♂, 3 ♀, same data as holotype (1 ♀, USNM; 2 ♂, 2 ♀, Montana Entomology Collection, Montana State University, Bozeman). One male and one female specimen were permanently slide mounted.

Remarks. All known specimens were collected in a Malaise trap placed on a downed tree and lumber pile at approximately 540 m in elevation (1800 ft).

Figures

FIGURE 1. Haromyia iviei gen. nov. et sp nov. male habitus of holotype. Note large setae on face and divergent wing venation.

FIGURE 3. Haromyia iviei gen. nov. et sp nov., anterolateral view of male head showing setae on bulging clypeus and anterior and lateral view of antennae. Female face and antenna is identical to the male.

FIGURE 4. Haromyia iviei gen. nov. et sp nov., wing of male holotype. Female wing is identical to the male.

FIGURE 5. Haromyia iviei gen. nov. et sp nov., male. A, hypopygium, left lateral view; B, hypandrium, ventral view; C, inner appendage immediately below cerci (probably the hypoproct or postgonites), ventral view, not illustrated in A. Abbreviations: ej apd—ejaculatory apodeme, hypd—hypandrium, sur—surstylus.