Rhamphomyia (Holoclera) bistriatella, Barták & Kubík, 2012

Barták, Miroslav & Kubík, Stepán, 2012, A review of the Palaearctic species of Rhamphomyia subgenus Holoclera (Diptera: Empididae) with description of 5 new species, Revue suisse de Zoologie 119 (3), pp. 385-407 : 387-389

Rhamphomyia (Holoclera) bistriatella sp. n. Fig. 1

HOLOTYPE: CULSP; 1 Ƌ; Spain, Pr. Cadiz, Hozgarganta , Tal bei Jimena, 200 m; 18.iv.1979; leg. W. Schacht.

PARATYPES: CULSP; 1 Ƌ; same data as the Holotype .

DISTRIBUTION: Spain.

DATE OF OCCURRENCE: April.

DESCRIPTION

Male: Eyes dichoptic, facets in dorsal half of eye smaller than in ventral half. Frons black, light grey microtrichose, 0.07 mm broad in the middle and 0.10 mm just above antenna, 0.24 mm long, with 4 pairs of fine setae about 0.10 mm long. Ocellar setae black, half as long as frons, ocellar triangle not much prominent and without additional setae. Face black, light grey microtrichose, 0.20 mm long and 0.10 mm broad ventrally, without setae. Occiput black, light grey microtrichose, sparsely and short setose, black setae arranged in two rows, postocular row complete, subparallel to hind eye margin, second row confined to dorsal half. Antenna black, both basal antennomeres brown, length of antennal segments (in 0.01 mm scale) = 10: 8: 25: 17, both basal antennomeres short setose (the longest setae about 0.08 mm long). Labrum brownish yellow, lustrous, 1.4 times as long as head is high. Palpus yellow with several short black setae. Gena very narrow, clypeus microtrichose. Thorax black to brownish black, mesoscutum with two somewhat darker stripes between rows of acrostichals and dorsocentrals. All thoracic setae dark. Chaetotaxy: proepisternum with 2-3 fine setae; prosternum and proepisternal depression without setae; 11 short (0.10 mm) and narrowly biserial (almost uniserial in front) acrostichals (in the paratype damaged by a pin); 5-8 uniserial dorsocentrals up to 0.20 mm long, 1-2 prescutellar pairs longer; intrahumeral present and strong; 1 long and strong posthumeral (no additional setae outside dorsocentrals in posthumeral area); 1 postpronotal and 2 shorter setae; 2-3 no-

Rhamphomyia (Holoclera) bistriatella sp. n., male terminalia (macerated), lateral view. Scale 0.1 mm.

topleurals (anterior part of notopleuron with 0-1 seta); 1 strong supraalar and 0-1 seta in prealar area; 1 long and 1 short and fine postalars; 4 scutellars (apical pair inserted wide apart); laterotergite with dark setae. Legs including coxae yellow (proximal parts clear yellow and more distal parts brownish yellow). Legs microtrichose (femora sublustrous), covered with dark setae. One long seta present in posteroapical comb on hind tibia. Both fore and mid femora and tibiae short setose, preapicals on tibiae unusually short. Hind femur with three short but distinct setae in apical third (in anterior, antero- and posterodorsal position). Hind tibia with 4-5 pairs of setae dorsally, not longer than tibia is deep. Basal tarsomeres of all legs thin and short setose, with short spines ventrally. Measurements (in 0.01 mm scale): length: f1 (148-155), f2 (176-182), f3 (228- 236), t1 (158-163), t2 (168), t3 (222-230), bt1 (98-104), bt2 (82-88), bt3 (116-120), width: bt1 and bt2 (5), bt3 (9). Wing clear, stigma light brown, veins brown, anal vein (A1) incomplete, absent in apical third. Costal seta present, axillary angle right. M2/D = 1.6-1.8, CuA1 ratio = 2.1-2.3, lw: ww = 3.2-3.4. Halter grey with yellow stem, calypter yellow with dark fringes. Abdomen brown, yellowish on basal segments and ventrally, microtrichose or slightly sublustrous, dark setose. Hind marginal setae on sides of tergites 2-3 subequally long as their segments, on remaining segments half as long, discal setae very short. The 8th tergite desclerotized dorsally. Terminalia ( Fig. 1 ): phallus rather thick but narrowed apically; cercus bilobate, straigth dorsally; epandriumsimple, triangleshaped. Lengthofbody 3.9-4.4 mm, wing 4.1-4.6 mm.

Female: Unknown.

DIFFERENTIAL DIAGNOSIS: Rhamphomyia (Holoclera) bistriatella sp. n. belongs to the R.­ flava group of Holoclera and it is most similar to and allied with R.­ bistriata Strobl. The main characteristics distinguishing these two species are as follows: halter yellow, fore and mid tibiae with dorsal setae at least as long as the tibia is deep and cercus with dorsobasal swelling (trilobate in lateral view) in R.­ bistriata , but halter grey, fore and mid tibiae without dorsal setae and cercus without dorsobasal swelling (bilobate in lateral view) in R.­ bistriatella sp. nov. Moreover, hypandrium is shorter and ejaculatory apodeme is larger in R.­ bistriatella than in R.­ bistriata . Differences in male genitalia are obvious when comparing Fig. 1 with Fig. 17f of R.­ bistriata (as R. pallidiventris (Fallén)) by Barták (1982). The female remains unknown; however, if it has a yellow thorax, it may go in the key to R.­ sciarina (Fallén, 1816) .

DERIVATIO NOMINIS: the specific name refers to its similarity to R.­ bistriata .

Figures

FIG. 1