Hilarempis barbatula Bezzi, 1909

Rafael, J. A., 2012, Revision of Neotropical species of Empididae (Diptera) described by Mario Bezzi. VIII. The species described in Hilarempis Bezzi, Zootaxa 3189 (1), pp. 56-68 : 58-59

Hilarempis barbatula Bezzi

( Figs. 11–22 , 71 )

Hilarempis barbatula Bezzi, 1909: 371 ; Melander 1928: 128 (checklist); Collin 1933: 110 (citation); Smith 1967: 34 (catalogue); Yang et al. 2007: 238 (catalogue).

Diagnosis. Dark brown to black, distinctly grey pruinose; frons and face setose; proboscis short; supracervical setae present; scutum with darker longitudinal bands, lateral band tenuous; legs predominantly dark brown; fore tarsomere 1 slightly swollen, subequal to fore tibia width; pterostigma tenuous at apex of costal cell; halter yellow.

Re-description. Lectotype male. Body 4.0 mm; wing 4.5 mm long. Head ( Fig. 11 ). Dichoptic. Frons ( Fig. 13 ) as wide as ocellar tubercle, slightly higher than greatest width, slightly divergent near antenna, with 6 lateroclinate setae, grey pruinose between setae, matte brown on margin. Face ( Fig. 14 ) slightly shorter than frons, slightly wider medially, subquadrate, grey pruinose with short distinct slender setae. Palpus yellow, slender, with long clear setae. Proboscis half head height, labrum black, shiny. Ocellar tubercle slightly protruding, ocelli reddish glassy; anterior ocellar seta robust, divergent and 4 shorter distinct posterior setae. Antenna ( Fig. 11 ) with scape and pedicel yellowish-brown, postpedicel velvety matte black, 1.5X longer than length of scape and pedicel combined, and almost same length as three-segmented stylus. Segment 1 of stylus very short, segment 2 longer, around 0.6 postpedicel length and 4X longer than thin segment 3. Postcranium ( Fig. 12 ) brown, densely grey pruinose; upper half with black more robust setae; lower half with clear slender setae; postocular setae short; vertical setae subequal to adjacent setae; occipital seta multiserial and misaligned, upper setae reaching supracervical plate. Gena and postgena with white slender setae.

Thorax ( Fig. 15 ). Dark brown to black, grey pruinose; postalar lobe light yellowish-brown; scutum with dark longitudinal bands between acrostichal and dorsocentral rows and between dorsocentral and supra-alar rows, lateral band wider, less conspicuous. Chaetotaxy: 3–4 black antepronotals, lateral setae more robust; 1 robust postpronotal, 8–10 slender, with anterior setae clearer; 5–6 white, slender proepisternals; about 15 white, slender proepimerals; uniserial acrostichals distinct in almost complete row, latter setae damaged by pin; uniserial dorsocentrals longer than acrostichals, posterior setae more robust; 3–4 short intra-alar presuturals; 3–4 intra-alar postsuturals in transverse row; 4–5 short aligned supra-alar presuturals; 5 aligned supra-alar postsuturals, penultimate seta robust; 3 robust posterior notopleurals and several anterior slender; 1 postalar; 2 robust scutellars, mixed with short slender intercalary setae.

Legs ( Figs 16–18 ). Dark brown with yellow-tinted joints, notably between femora and tibiae. Short setae, some more robust than others. Fore tibia ( Fig. 16 ) with row of longer posterodorsal, posterior and posteroventral setae; fore tarsomere 1 slightly swollen, subequal to fore tibia width and about 0.5X length of fore tibia, with apical crown of more robust setae. Mid tibia ( Fig. 17 ) with 1–2 anteroventral setae and 3 equidistant posteroventral slightly more robust setae. Hind tibia ( Fig. 18 ) with 4 anteroventral setae, two distal set closely together, and 1 dorsal placed medially and slightly more robust than other setae.

Wing ( Fig. 71 ). Hyaline with brown veins; base of costal vein with one robust seta (not illustrated in figure); pterostigma tenuous, light brown at apex of costal cell. A 1 evanescent on distal 0.25. Halter yellow.

Abdomen dark brown to black densely grey pruinose in anterior view; dark brown to matte black in dorsal view, grey laterally; setae clear, distinct, lateral setae on basal tergites longer. Tergite 7 with uniserial row of setae posteriorly. Sternites concolorous with tergites. Tergite 8 ( Fig. 20 ) with distinct posterolateral setae.

Terminalia ( Figs. 19–23 ). In natural position upward-directed and proclinate. Cercus somewhat separated from lobe formed by cercal plate + bacilliform sclerite. Epandrium ( Fig. 21 ) suboval, with small dorsal cleft. Hypandrium ( Figs. 21–22 ) with lateral apical projection. Postgonite ( Fig. 21 ) with subapical expansion. Phallus ending at level of postgonite apex. Ejaculatory apodeme lamella-form.

Female. Unknown.

Geographic distribution. Peru, Junin.

Material examined. LECTOTYPE ♂ (here designated), “ PERU [Junin], Oroya , 21.i.1904, 4000 m ”.

Lectotype condition. Left postpedicel missing. Right wing on microslide; terminalia in vial with glycerin.

Remarks. This species was described based on an undetermined number of specimens (einige Exemplare) from same locality, Peru, Oroya. The single remaining specimen in Dresden is labelled lectotype accordingly to fix and stabilize the current concept of the name.

Discussion. Using Collin (1933) key, H. barbatula runs to couplet 38 of H. idonea Collin, 1933 , with the following characters (using the same of Collin's key): eyes separated on frons, thorax with dark ground-colour, antennae all dark, dorsocentral setae uniserial, antennal stylus longer than large, femora without stout bristles or spines below, occipital bristles more than uniserial above, first tarsomere 1 of male dilated (at least as wide as fore tibia, not slender as described for H. commoda ), frons with 1–2 pairs of longer bristles mixed with short hairs, thorax grey with four brown bands. The frons in H. barbatula has several pairs of setae subequal in length and do not fit the next couplet of Collin (39, “frontal hairs all short”). Both H. barbatula and H. idonea have a long radial fork, in H. barbatula section of vein R 4+5 as long as section of vein R 5 ( Fig. 71 ). Both have the same shape of postgonite enlarged subapically, but H. barbatula has no posterodorsal protuberance on the epandrium ( Fig. 21 ), as is present in H. idonea ( Collin 1933: 134, fig. 25e).

Figures

FIGURES 11–22. Hilarempis barbatula Bezzi, lectotype ♂ (pres. design.). 11, head, lateral view; 12, postcranium, posterolateral view; 13, frons, frontal view; 14, face, frontal view; 15, thorax, dorsal view; 16, left fore leg, posterior view; 17, left mid leg, anterior view; 18, left hind leg, anterior view; 19, terminalia before maceration, lateral view; 20, tergite 8, dorsal view; 21, terminalia, lateral view; 22, terminalia, posterior view. Abbreviations: ce = cercus, ce + b scl = cercus + bacilliform sclerite, ej ap = ejaculatory apodeme; ep = epandrium, hypd = hypandrium, ptg = postgonite; ph = phallus. Scale bars: 11–15, 19 = 0.5 mm; 16–18 = 1.0 mm; 20–22 = 0.2 mm.

FIGURES 70–75. Wings. 70, Hilarempis argentifera Bezzi, holotype ♀; 71, H. barbatula Bezzi, lectotype ♂ (pres. desig.); 72, H. carinata Bezzi, lectotype ♂ (pres. desig.); 73, H. elegans Bezzi, holotype ♂; 74, H. gymnaspis Bezzi, lectotype ♂ (pres. desig.); 75, H. xanthocera Bezzi, ♀ specimen from Peru.