Setacera trina Collin 1963

Setacera meneghinii Canzoneri

Setacera meneghinii Canzoneri, 1978:28.

DESCRIPTION.—Moderately large shore flies, length 4.0 to 4.5 mm; generally olivaceous brown with some bluish to greenish tinges dorsally, becoming grayer and duller ventrally (Canzoneri, 1978; the male paratype I examined was approximately 3.9 mm but lacked the terminal segment of the abdomen

Head (Figure 67): Head width-to-height ratio 1 : 0.58; frons width-to-length ratio 1 : 0.48; metallic luster of mesofrons and fronto-orbits deeply greenish blue, dorsum of interfoveal carina bronzish green; dorsal surface of face shorter than anterior surface; angle formed by anterior surface and dorsal surface obtuse, about 120°; face brownish gold dorsally, becoming mostly whitish ventrally. Eye width-to-height ratio 1 : 1; eye-to-cheek ratio 1 : 0.44.

Thorax: Fore- and midtibiae with basal one-fourth or less pale. Costal vein ratio 1 : 0.26; M1+2 vein ratio 1 : 0.92.

Abdomen: Male terminalia (Figures 68, 69) with apices of recurved surstyli rounded laterally, not pointed (Figure 69) in posterior view; gonite in lateral view moderately wide, tapered gradually toward apex until just before apex, thereafter abruptly tapered to form acutely pointed apex. Females unavailable for study.

TYPE MATERIAL.—The male holotype is labeled (based on the label data of a male paratopotype) “RIETI Sorgenti Solfuree 14-VIII-58 [14 Aug 1958] A. Giordani Soika.” The allotype female and a male paratype are from the same locality and were collected on the same date. The female paratype from Bagni di Tivoli (27 Oct 1974, W. Rossi) was misidentified and is a female of S. breviventris. The type series is in the Museo Civico di Storia Naturale de Venezia, Italy.

DISTRIBUTION (Figure 70—Presently known only from the type locality. ITALY. Rieti Province: Rieti.

Setacera trina Collin

Setacera trina Collin, 1963:148.—Karnecká, 1980:421 [list, Czechoslovakia].

Ephydra trina.—Nartschuk, 1970:387 [key].

DESCRIPTION.—Moderately large shore flies, length 4.21 mm (1 female); generally olivaceous brown with some greenish coloration dorsally, becoming grayer and duller ventrally.

Head (Figure 71): Head width-to-height ratio averaging 1 : 62; frons width-to-length ratio averaging 1 : 0.47; metallic luster of mesofrons and fronto-orbits greenish blue to mostly bluish, dorsum of interfoveal carina lighter colored, subshiny, mostly bronzish green; dorsal surface of face shorter than height of anterior surface; facial angle formed by anterior surface and dorsal surface about 110°; face silvery white to light brownish white, slightly darker dorsally; eye height-to-width ratio averaging 1 : 1; eye-to-cheek ratio averaging 1 : 0.43.

Thorax: Tibiae mostly dark colored, only femoral-tibial articulation pale. Costal vein ratio averaging 1 : 0.29; M1+2 vein ratio averaging 1 : 1.

Abdomen: Male terminalia (Figure 72) with gonite in lateral view with posterior projection broadly triangular, apical angle about 45°. Female terminalia as in Figure 74; female ventral receptacle (Figure 73) with cervix parallel sided, C-shaped corpus moderately compressed, curvature at junction with cervix abrupt.

TYPE MATERIAL.—The male lectotype, herein designated, is labeled with a round disk, on the underside of which is written “Snailwell [Cambridge] 4.7.11 [4 Jul 1911]/Setacera trina TYPE [handwritten]/LECTOTYPE Setacera trina Collin by W. N. Mathis [handwritten, red].” The lectotype is in the University Museum, Oxford University, Oxford, England. The specimen is double mounted (minute nadel in foam block) and is in good condition, although some of the tarsomeres of the left legs are missing. The abdomen has been removed and dissected; the male terminalia are mounted in balsam on a celluloid rectangle that is pinned separately from the rest of the body.

OTHER SPECIMENS EXAMINED.—GREAT BRITAIN. Norfolk: Roudham Heath, 28 Sep 1947 (1; UMO GERMANY. Bayern: Dachau (1; USNM

DISTRIBUTION (Figure 70—In addition to the localities listed for the specimens I examined, Collin (1963) recorded this species from the following counties in Great Britain: Cambridgeshire, Devonshire, Hampshire, Herefordshire, Hertfordshire, Norfolk, Suffolk, and Surrey. Karnecká (1980) recently recorded this species from Bohemia and Moravia in Czechoslovakia. Although specimens are known only from Great Britain, Czechoslovakia, and Germany, I suspect that the species will be found to occur more widely in northern Europe. This is the northernmost species of the trina group.

DISTRIBUTION.—See species treatment, page 36.

NATURAL HISTORY.—See species treatment, page 36.