Thecomyia chrysacra Marinoni and Steyskal

Marinoni, Luciane, Steyskal, George C. & Knutson, Lloyd, 2003, Revision and cladistic analysis of the Neotropical Genus Thecomyia Perty (Diptera: Sciomyzidae), Zootaxa 191, pp. 1-36 : 23

7. Thecomyia chrysacra Marinoni and Steyskal , new species ( Figs. 4, 5 , 12 , 24 , 36, 41, 42)

Description. Adult. Upper orbital seta present. Fronto­orbital spot oblong, width approximately 1/3 frontal width. Rostrum 0.54­0.64 in males and 0.67­0.7 in females as high as eye. White microtomentose infra­ocular marking in lateral view not forming a triangle. Mid femur with short anteromedial seta. Mid and hind femora brownish apically. Mesonotum with complete, well defined medial yellow stripe ( Fig. 4 ). Tergite 5 nearly wholly golden yellow. Ejaculatory apodeme very wide apically, posterior margin concave, anterior margin almost straight ( Fig. 12 ). Phallapodeme almost straight and slightly concave at articulation with basiphallus, without subapical process. Anterior basiphallic process with apex folded. Epiphallus large, well developed, extending to base of distiphallus. Distiphallus with 3 long digitiform extentions, left extention in lateral view wider and s­shaped. Hypandrium in lateral view with dorsal margin almost straight, anteroventral margin narrow, rounded ( Fig. 24 ). Anteroventral hypandrial plates in frontal view very broad. Membranous projections of margins of anteroventral hypandrial plates extending to lateral margins of hypandrium, covered with minute hairs ( Fig. 24 ). Posterior and anterior surstyli distinct; posterior surstylus apically pointed, in posterior view clawlike ( Fig. 12 ). Female sternites 6, 7 and 8 almost fused, suture between 6 and 7+8 visible, longer than wide; anterior margin of sternite 6 very slightly sinuate; mid longitudinal portion less sclerotized. Spermathecal duct with sclerotized region joining spermatheca short; apical, digitiform projection broad at base and short (Fig. 36).

Type specimens. HOLOTYPE MALE. 1. Small rectangular label: [ GUATEMALA] "La Providencia Obispo Guat"; 2. Small rectangular label: "J. M. Aldrich Coll, IV 18­26 " ( USNM). In excelent condition. PARATYPES. The same labels as holotype, 4 m. and 3 f. ( USNM); 3 m. and 4 f. ( DZUP).

Other specimens examined. NICARAGUA. Managua, 5­16 May 1943, F.M. Snyder col., 1 m. ( USNM). COSTA RICA. Higuito, San Mateo, no date, no col., 1 m. ( CNC); same locality, no date, Pablo Schild col., 1 m. ( CNC); same locality, no date, same col., 1 f. ( USNM). PANAMA. Gamboa, Pipeline Road, Jul 1967, W.W. Wirth col. (Malaise trap), 1 f. ( USNM); Juan Mina, 28 Aug 1923, R.C. Shannon col., 3 m. ( USNM); Alhajuela, 19 Apr 1911, August Busck col., 2 m. ( CNC). VENEZUELA. CARABOBO, Yuma, 16 Sep 1976, J.M. Ayala col., 1 m. ( USNM).

Etymology. The species epithet, chrysacra , which is derived from Latin, is a combination of chryso, meaning gold or golden, and acra, meaning top or dorsum, in reference to the nearly wholly golden yellow fifth tergite.

Figures

FIGURES 2 ­ 5. Thecomyia mathisi: 2, head, anterolateral view; 3, head anterodorsal view. Thecomyia chrysacra Marinoni and Steyskal: 4, thorax, dorsal view; 5, abdomen, dorsal view.

FIGURES 12 ­ 14. Male terminalia, left lateral view: 12, Thecomyia chrysacra Marinoni and Steyskal; 13, T. mathisi Marinoni; 14, T. naponica Marinoni and Steyskal.

FIGURES 24 ­ 29. Hypandrium, frontal view and right lateral view: 24, Thecomyia chrysacra Marinoni and Steyskal; 25, T. mathisi Marinoni; 26, T. naponica Marinoni and Steyskal; 27, T. papaveroi Marinoni and Steyskal; 28, T. signorelli Marinoni and Steyskal; 29, T. tricuneata Marinoni and Steyskal.