Argentinomyia octomaculata ( Enderlein, 1938 )

Montoya, Augusto L. & Wolff, Marta, 2023, Taxonomic revision of the Neotropical genus Argentinomyia Lynch-Arribálzaga, 1891 (Diptera: Syrphidae), with description of 16 new species, Zootaxa 5234 (1), pp. 1-157 : 101

Argentinomyia octomaculata ( Enderlein, 1938)

Proposed standard English name: Eight-spotted long-antennae flower fly.

Allograptina octomaculata Enderlein, 1938: 226 . Type locality: MEXICO. HOLOTYPE Female ZMHU (non-examined). Refs.: Thompson 1999a: 375, Fig. 13–15 ; Thompson 1999b: 51 (Species incertae sedis status); Thompson et al. 2010, 779, couple 84 (key to Argentinomyia octomaculata )

Allograptina octomaculata . Vockeroth 1969: 138

Allograptina octomaculata . Thompson et al. 1976: 39

Rhysops octomaculatus . Thompson 1999a: 338 (taxonomic status notes)

Type material. HOLOTYPE. Adult female, MEXICO. No precise locality was given. Deppe S. ( ZMB 4012 ).

Length. Body, 7.5–8.3mm; Wings, 7.2–7.7mm.

Diagnosis. Face, scutellum and pleuron partially pale in color, usually yellow or yellowish-brown in ground color; face with three to four transversal grooves, calypter wholly brown; all coxae yellow; abdomen with a pair of long, apically rounded oblique maculae on 2 nd to 4 th terga.

Redescription. FEMALE. Head (Adapted from Enderlein, 1938 and Thompson 1999a). Face orange, perpendicular, tubercle low, covered with yellow golden pilose, leaving a lineal spot in the middle dorsal antennae and a broad median vitta ventral shining, somewhat metallic yellow. Frontal triangle whitish pollinose, with a broad opaque band just ventral ocelli, gradually fading into white pollen in depression, pile brownish. Gena orange more thinly yellow pollinose, yellow pilose. Ocellar triangle grey metallic, black pile. Occiput smooth, yellow pilose. Antennae yellow-brownish, scape and pedicel about as long as basoflagellomere darkened on dorsal 1/2 and at apex; arista reddish, darker toward the tip, pilose. Thorax: Grey to yellow-orange, mesonotum grey-blue semishning, grey pollinose, yellow-golden pilose; with two medians gray pollinose vittae on anterior half. Pleura yellowish-white pollinose, yellow pilose, yellow on postpronotum and supracoxa, the middle region of anepimeron, dorsal surface of katepisternum, katatergum, anatergum and postalar callus. Scutellum yellow shining, yellow-golden pollinose, with long yellow hairs and short yellow pile intermixed; fringe short and yellow. Wing: Hyaline yellow ocher, slightly brownish on apex, stigma yellow ocher, mostly bare, costal cell bare, cells dm and r bare, cell cua bare on anterior 1/3; almost bare on basal 2/3 or more; calypter wholly brown; plumula yellow, halter yellow-orange, capitulum orange. Legs: Pro- and metalegs brown-yellow, yellow pilose; metafemur brownish except yellowish on underside near the base and dorsal apex; metatibia yellowish on basal 1/6; tarsus brownish, pile black, with a few yellow hairs toward femur bases; metabasitarsomere long, five to six times longer than broad, all coxae yellow. Abdomen: Oval, 1 st tergum brown with base and lateral sides yellow; 2 nd tergum brownish-orange, elongate, apically rounded, lateral maculae along the outer portion of tergum; 3 rd and 4 th terga with two elongated oval maculae, reaching the apical 2/3 of tergum respectively; 5 th tergum with slightly smaller maculae that begin at the base; sterna yellowish, black pilose.

Male. Unknown.

Taxonomic notes. Argentinomyia octomaculata is similar to A. festiva and A. catabomba , differing by the following combination of characters: Face, scutellum and pleuron partially pale in color, usually yellow or yellowishbrown in ground color; face with three to four transversal grooves; abdomen with a pair of long, apically rounded maculae on 2 nd to 4 th terga. A. octomaculata is also similar to A. CR-21 and A. humboldti sp. nov. differing from them by the facial tubercle yellow; calypter wholly brown; all coxae yellow; abdomen with a pair of long, apically rounded oblique maculae on 2 nd to 4 th terga (see “diagnosis” under each species or key).

Geographical range. Argentinomyia octomaculata is so far only known from Mexico ( Mexico D.F.).

Figures

FIGURE 13. Argentinomyia altissima (Fluke, 1945), male genitalia. A. Whole genitalia, lateral view; B. Epandrium, dorsal view; C. Hypandrium, ventral view. Scale bars: 1 mm. D–E. Natural habitus of a female specimen in Pumapaccha, Cuzco, Perú (iNaturalist catalogue number# 37168068; https://www.inaturalist.org/observations/37168068). Photo taken by ©Jared Shorma.

FIGURE 14. Argentinomyia aurifacies sp. nov., male Holotype (USNM ENT 01443646): A. Head, frontal view; B. Dorsal view; C. Lateral view. Female (USNM ENT 00038431): D. Head, frontal view; E. Dorsal view; F. Lateral view. Scale bars: 5 mm.

FIGURE 15. Argentinomyia aurifacies sp. nov., male Holotype, genitalia. A. Whole genitalia, lateral view; B. Epandrium, dorsal view; C. Hypandrium, ventral view. Scale bars: 1 mm.