New species of Macrostomus Wiedemann (Diptera, Empididae) from Colombia, Ecuador and Peru Author Rafael, José Albertino Author Cumming, Jeffrey M. text Zootaxa 2006 1136 49 64 journal article 10.5281/zenodo.171981 8ee587b3-3852-49d2-9297-995428a3531a 1175­5326 171981 Macrostomus occidentalis , n. sp. ( Figs. 20–22 , 40 ) Diagnosis. Postcranium black dorsally, rather yellow ventrally; thorax, abdomen and legs predominantly yellow; male fore tarsomeres 1–3 light brown, not white distally; hind tarsomere 1 with 7 slender dorsal setae; cell dm rather truncate; M1, M2 and A1 rather evanescent distally; male tergite 8 acute distally with apex rather blunt. FIGURES 12–19 . Macrostomus lineatus , n. sp. holotype ɗ and paratype Ψ. 12, male wing; 13, male tergite 8, dorsal view, right setae not represented; 14, male terminalia, lateral view, internal apex of epandrium in detail; 15, hypandrium and phallus, lateral view; 16, female wing; 17, female tergite 8 and sternite 8, lateral view; 18, female sternite 8, ventral view, left setae not represented; 19, female genital fork. FIGURES 20–22 . Macrostomus occidentalis , n. sp. , holotype ɗ. 20, tergite 8, dorsal view, right setae not represented; 21, epandrium and cerci, lateral view; 22, hypandrium and phallus, lateral view. Description. Male. Frons approximately one­third of anterior ocellus width. Face slightly wider than frons only at apex. 1 pair of ocellar setae. Postcranium black dorsally, yellow ventrally. Postgena with slender setae. Antennae black with scape and pedicel yellow; flagellum trisegmented. Palpus yellow. Thorax yellow with yellow to gray­brown pruinescence. 4 dorsocentral setae; 1 presutural supra­alar seta; no postsutural supra­alar seta; 3 notopleural setae; 2 pairs of scutellar setae; 3–5 antepronotal setae; 1–3 tiny proepisternal setae; 3–5 katatergital setae. Legs entirely yellow with apex of hind femur and all tarsi slightly light brown. Slightly stronger setae: hind femur with 5–6 anteroventral subapical stronger. Slender setae: hind trochanter with 1 posterior long and slender; hind tibia with 7 dorsal; hind tarsomere 1 with 7 dorsal. Wing with costal margin and pterostigma inconspicuously light brown­infuscated; cell dm rather truncate; M1, M2 and A1 rather evanescent distally. Halter yellow with knob slightly brown. Abdomen yellow with dorsal half of terminalia black. Terminalia. Tergite 8 ( Fig. 20 ) with rather blunt projection distally. Epandrium ( Fig. 21 ) with anterodorsal and posterodorsal lobes of subequal length. Anterior cercus ( Fig. 21 ) rather elongate; posterior cercus with bifid apex, slender anterodorsal setae and a small inconspicuous simple protuberance at margin. Hypandrium ( Fig. 22 ) membranous at posterior basal half, without strong setae and with a rather membranous paired protuberance distally. Female. unknown. Size. Body not measured; wing 3.4 mm . Geographical distribution. Colombia (Cauca) ( Fig. 40 ). Material. Holotype ɗ: COLOMBIA [Cauca], Buenaventura, xi.6.1950, Michelbacher and Ross (CAS). Holotype condition. Left antenna and left mid leg lost. Abdomen in glycerine. Etymology. From Latin occidens = west, in reference to the distribution, west of the Andes. Discussion. M. occidentalis appears related to M. ferrugineus (Fabricius) and M. fulvithorax (Curran) which all possess a rather long and truncate tergite 8 projection (although shorter and more acuminate in M. ferrugineus , shorter and truncate in M. fulvithorax ). M . occidentalis differs from both in the structure of the male genitalia and in the postcranium, which lacks a dorsal shinning spot (present in the other two species), as well as in hind tarsomere 1, which bears 7 slender dorsal setae (maximum of 5 in the other two species).