Ommatius (Pygommatius) litoreus, Scarbrough & Marascia, 2003

Scarbrough, Aubrey G. & Marascia, Claudio G., 2003, Revision of Ommatius Wiedemann (Diptera: Asilidae). IV. Pygommatius subgen. nov. with twenty-five Afrotropical species, Zootaxa 228 (1), pp. 1-94 : 41-43

publication ID	https://doi.org/ 10.11646/zootaxa.228.1.1
DOI	https://doi.org/10.5281/zenodo.5080331
persistent identifier	https://treatment.plazi.org/id/03A9FF3D-FFF2-FFE6-9D15-5F50FB48C284
treatment provided by	Felipe
scientific name	Ommatius (Pygommatius) litoreus
status	sp. nov.

Treatment

Ommatius (Pygommatius) litoreus View in CoL , sp. n.

Figs. 13 View FIGURES 1120 , 26 View FIGURES 2128 , 35 View FIGURES 2938 , 43 View FIGURES 3948 , 152159 View FIGURES 152159

Male. Length, body 1011.0 mm; wing 7.0 7.5 mm. Black. Head: Yellow to gray tomentose with mostly yellow to white setae. Face with 6 thin, brown bristles and 4 pencillike yellow bristles; several, thinner, yellow bristles ventrally; sparse yellow setae present dorsally; FHWR 1.0:7.11.0:7.5. Proboscis and palpus with very narrow base yellow. Frons brown setose. Antenna brown; pedicel beadlike, as long as but much wider than flagellum. Frons yellow to brownyellow tomentose. Ocellar tubercle with longest seta subequal to 3 antennal segments combined. Occiput with 35 brown bristles, longest with apex third distance toward ocellar tubercle.

Thorax: Mesonotum with mostly brown tomentum, postalar callus and prescutellum yellowish, narrow sides yellowishgray; setae sparse, short, mostly brown; 34 dorsocentral and 4 lateral bristles present. Scutellum dorsally brown tomentose, apically yellow; sparse, thin, yellow setae and 2 brown marginal bristles present. Pleuron mostly black, narrow posterior below halter yellow; tomentum yellowishgray tomentose; yellow setose; thin, yellow anepimeral bristle present. Halter yellow to reddishyellow.

Wing ( Figs. 13 View FIGURES 1120 ): Microtrichia dense apically, extending as narrow lines in anterior cells and along posterior margin. Cell r 4 with veins slightly diverging apically. Apex of cell m 3 perpendicular to wing axis, slightly curved, just beyond rm.

Leg: Fore and hind coxae yellow, middle coxae brown; tomentum gray, setae and bristles mostly yellow, none unusually thick; fore coxa apically with numerous, short, brown setae. Trochanters mostly yellow, at least ventrally, narrow margins brown; hind trochanter often brown posteriorly with a short yellow bristle. Fore and middle femora yellow, narrow apices often brown, hind femur mostly yellow, apical half to slightly less brown. Fore femur ( Fig. 26 View FIGURES 2128 ) basally wide with 45 thick, unusually long, yellow, ventral bristles. Middle femur with brown bristles anteriorly; anteroventral bristles absent, 34 short yellow setae present; 4 thick, yellow bristles and a long row of short, comblike, yellow bristles present posteroventrally. Hind femur ( Fig. 35 View FIGURES 2938 ) widest at basal third, a weak ventrobasal concavity present; 1 unusually long, brown, anteroventral bristle present on apical third; 3 5 short, brown, posteroventral bristles with round apices present basally, and a row of several setae and bristles beyond basal group of bristles, the basal ones shortest, each being longer and thicker, apical bristle unusually long and separated from row by wide space; HFWLR 1.0:5.41.0:5.8. Tibiae entirely to mostly yellow; hind tibia ( Fig. 43 View FIGURES 3948 ) with apical third brown, slightly swollen medially with numerous, yellow and brown setae on basal half, several long and bristly; preapically only slightly constricted; raised, black flange present apically, slightly concave on one side. Fore and middle tarsi with basal tarsomere mostly yellow, narrow apex brown, the former with 12 yellow bristles; basal tarsomere of hind tarsus light yellowishbrown basally.

Abdomen: Brown with apical margins of all tergites and basal 5 sternites, and narrow lateral margins and wide apical corners of most tergites yellow. Tergites mostly brown tomentose dorsally, sides and sternites gray to yellow; mostly short, brown setae present. Apical 6 tergites with 12 or more bristly setae apical margins; sternites 4 and 6 with erect, yellow bristles, those on 4 longest; sternite 5 with several, short, thick bristles in apical corner, most yellow, 35 usually brown, plus a few minute bristles posteriorly, peglike. Sternites 78 brown setose; numerous brown bristles present along apical margin of sternite 8.

Terminalia ( Figs. 152156 View FIGURES 152159 ): Epandrium 2 branched; dorsal branch narrowed apically, apex acute; ventral branch wide apically, with corners turned vertically. Gonocoxite with surface rugose, prominent flange present. Aedeagal sheath flat, expanded laterally, forming an oblique, oval, shield above distiphallus; surface with minute grooves. Hypandrium strongly produced, narrow ventrally, with strong angular apex; surface with minute grooves and ridges.

Female. Differs from male as follows: Length, body 9.0 11.3 mm; wing 7.48.5 mm. Head: FHWR 1.0:6.61.0:6.7. Proboscis with narrow base light brown to brownyellow. Thorax: Anepimeral bristle thin, setalike. Leg: Fore coxa with only yellow bristles and setae. Hind coxa, fore trochanter, and middle trochanter brownyellow; hind trochanter brown. Femora normal, without unusually long, thick bristles ventrally. Middle femur basally with 3 long, thin, brown or yellow, anteroventral bristles; a row of 45 thin, long, usually brown, posteroventral bristles present; comblike row of short, thin, yellow bristles absent. Hind femur normal, without a ventral constriction basally; 2 rows of 57 long, thin, mostly brown, bristles, in each ventral row; basal 3 posteroventral bristles third as long as hind femur; apical bristle in each ventral row not unusually long as in male; HFWLR 1.0:5.71.0:6.3. Hind tibia sometimes slightly swollen medially, otherwise normal. Abdomen: Most segments with apical margins yellow, sides of tergites narrowly yellow; all bristles along apical margin short, thin, setalike. Sternites 46 without bristle patterns as in male. Tergitre 9 extremely narrow dorsomedially, membranous. Terminalia ( Figs. 157 159 View FIGURES 152159 ): Three spermathecae present; duct basal, slightly lateral.Sternite 8 with apical margin broadly rounded; a short, low median carina present medioapically.

SPECIMENS EXAMINED. Holotype ♂, allotype ♀, paratypes 2 ♂, KENYA: Kilifi Distr. / Mida Creek 8 mi S. / Gede. 201 20.I.1970 / M. E. Irwin and / E. S. Ross ( CASC) . Paratypes: KENYA: 1 ♀, Kilifi Distr. / Gede. alt. 100 ft. / 31.xii.1969 / M. E. Irwin and / E. S. Ross ( CASC) ; 4 ♂ [1 without terminalia], 6 ♀ [1 without terminalia], Diani Beach / vii.1951 / N. L. H. Krause / B. M. 1951541 ( BMNH) ; 6 ♀, Diani Beach / viii.1951 / N. L. H. Krauss / B. M. 1951541 ( BMNH) ; 1 ♀ [terminalia absent], Diani Beach / ix.1951 / N. L. H. Krauss / B. M. 1951541 ( BMNH) ; 1 ♀, Mombasa / Diani Beach / 20.xii.1961 / J. Bowden ( BMNH) ; 2 ♀, Gedi N. R. / 78.xi.1973 / Michel Boulard ( MNHN) .

Distribution. A riverine species captured at low elevations from September to August in Kenya.

Etymology. Latin, litoreus , meaning shore or beach, referring to the site where specimens were collected.

Remarks. In addition to the characters in the key, O. litoreus is also distinguished by the presence of stout ventral bristles on the base of the fore femur ( Fig. 26 View FIGURES 2128 ) and the stout posteroventral bristles and numerous, short, comblike bristles on the middle femur.