Stenopa mexicana Norrbom, 2010

Norrbom, Allen L., Sutton, Bruce D., Steck, Gary J. & Monzón, José, 2010, New genera, species and host plant records of Nearctic and Neotropical Tephritidae (Diptera) 2398, Zootaxa 2398, pp. 1-65 : 57-58

Stenopa mexicana Norrbom , new species

Fig. 96

Cecidocharella sp. : Foote 1980: 68, fig. 42.

Diagnosis. This species differs from S. affinis in having the lateral vertical seta brown, and from S. vulnerata in having clusters of setulae on the posterior margin of the scutum and on the scutellum, and from both species in the markings on the anal lobe, which has an isolated brown marginal spot.

Description. Mesonotum length 2.3 mm. Wing length 5.75 mm, width 2.60 mm, ratio 2.21. Head: Yellow to orange, entirely microtrichose, densely bright white microtrichose on lateral margin of face, facial ridge, parafacial, lateral margin of frons, and postgena. Face and frons medially orange, ocellar tubercle brown, most of occiput mottled orange brown, most of gena orange brown. Parafacial without brown spot. Frons anteromedially with numerous yellow slender setulae; 3 frontal setae, all brown; 2 orbital setae, both acuminate, anterior seta brown, posterior seta pale brown; ocellar and medial vertical seta well developed, brown; lateral vertical seta acuminate, brown, ca. 2/5 as long as medial vertical seta; postocellar and paravertical setae yellow, lanceolate; postocular setae mixed small, pale brown, acuminate and larger, yellow, lanceolate; genal seta brown; postgenal setulae numerous, large, yellow, acuminate.

Thorax: Mostly mottled reddish brown, scutellum, subscutellum and mediotergite darker brown; scutum entirely grayish to tan microtrichose. Scutellum very strongly convex, entirely sparsely microtrichose, microtrichia mostly grayish but dark brown narrowly along base medially; subscutellum entirely densely dark brown microtrichose; mediotergite shiny, nonmicrotrichose on medial half, sparsely gray microtrichose narrowly on dorsal margin and more broadly laterally, broadening ventrally; pleuron entirely microtrichose including anepisternum and katepisternum.

Thoracic setae long, dark brown, and acuminate, including postpronotal, 2 notopleural, presutural and postsutural supra-alar, dorsocentral, acrostichal, intra-alar, postalar, 2 scutellar, 2 anepisternal, katepisternal, and anepimeral. Posterior notopleural seta ca. 3/5 as long as anterior notopleural. Dorsocentral seta aligned slightly closer to transverse suture than level of postsutural supra-alar seta. Scutal setulae yellow, lanceolate, more or less evenly distributed in irregular rows, with loose cluster of 5–6 setulae on posterior margin anterior to corner of scutellum. Scutellum with loose cluster of 8–9 yellow, lanceolate setulae proximal to basal seta.

Wing ( Fig. 96): Costa with 2 setae at humeral break and 3 setae at subcostal break 2–3 times as large as other costal setulae. Pterostigma short, 0.36 times as long as cell c, subrectangular; vein R 1 strongly curved subapically. Vein R 2+3 relatively straight, area surrounding it proximal to level of apex of R 1 concave but not distinct bulla; relatively long, ending considerably distal to level of dm-cu, distance between apices of R 1 and R 2+3 / distance between apices of R 2+3 and R 4+5: 2.70. Vein R 4+5 slightly curved and vein M nearly straight distal to dm-cu so that cell r 4+5 is slightly broader medially than at apex; cell r 4+5 without bulla anterior to dm-cu. Crossvein dm-cu length/ width of radial cells measured directly anterior to it: 0.63. Wing pattern with 2 marginal hyaline areas in cell r 1, proximal mark extending to vein M, distal mark extending almost to vein Cu 1; cell cu 1 with 1 marginal hyaline mark, including apex of vein A 1 +Cu 2, extending anteriorly into basal part of cell dm, almost reaching vein M; crossvein r-m 0.50 distance from bm-cu to dm-cu, within proximal hyaline mark extending from cell r 1. Anal lobe with large marginal brown spot isolated by inverted-C shaped hyaline area of similar width. Anterior apical band separated from costa by extremely narrow hyaline area in cells r 1 and r 2+3, slightly broader at apex of vein R 2+3. Cell m with proximal hyaline mark well separated from dm-cu, extending anteriorly slightly beyond vein M; distal hyaline mark extending anteriorly to slightly beyond vein R 4+5.

Type data. Holotype ♂ ( AMNH), MEXICO: Paso de Cortes, 16 Feb 1947, W. G. Downs. The abdomen of the holotype is missing, but the wing slide has a male symbol. The type locality is on the México / Puebla bor- der, approximately 19°5'N 98°38'W.

Distribution. Central Mexico.

Etymology. The epithet is an adjective based on the country of origin of the holotype.