Phacelochaeta obliqua 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 : 35-37

Phacelochaeta obliqua Norrbom , new species

Figs. 54, 66–68

Diagnosis. This species differs from its congeners in having the apical wing band more oblique and touching or extending anteriorly beyond the apex of vein R 2+3. The anterior end of the penultimate band is more widely separated from the apex of vein R 2+3 than in the other two species, but is more narrowly separated from the band crossing the pterostigma. There also is a distinct indentation in cell r 1 in the distal margin of the band through the pterostigma that is weak or not present in the other two species. The lateral surstylus ( Figs. 66–67) is longer and more acute than in P. quinquefasciata ( Figs. 75–76). The male is unknown for P. quinquevittata .

Description. Body length, male 4.0 mm, female 5.0– 5.5 mm. Mesonotum length 1.80–2.05 mm. Wing length 5.50 mm, width 2.17 mm, ratio 2.53.

Head: Orange except occiput dorsally and ocellar tubercle brown, entirely whitish to grayish microtrichose. Parafacial without brown spot. Frons anteromedially with numerous slender yellow setulae; 3– 4 brown, acuminate frontal setae; 2 orbital setae, both acuminate, anterior seta brown, posterior seta yellow; ocellar and medial vertical setae well developed, brown; lateral vertical seta lanceolate, yellow, ca. 1/3 as long as medial vertical seta; postocellar and paravertical setae yellow, lanceolate; postocular setae mixed minute, brown, acuminate and large, yellow, lanceolate; genal seta brown; postgenal setulae numerous, large, yellow, acuminate. Facial ridge relatively broad, with numerous proclinate slender yellow setulae.

Thorax: Dark brown except postpronotal lobe mostly orange; mostly densely microtrichose. Mesonotum grayish microtrichose; posterior margin of scutum with irregular dark brown microtrichose area with 2 pairs of broad angular lobes extended anteriorly, 1 to acrostichal seta and 1 almost to intra-alar seta. Scutellum very strongly convex; shiny, nonmicrotrichose except basolateral corner, extreme apical margin, and underside dark brown microtrichose. Subscutellum dark brown microtrichose on dorsal half, shiny, nonmicrotrichose ventrally. Mediotergite shiny, nonmicrotrichose except extreme dorsolateral corner grayish microtrichose, and sometimes with small, sparser, more ventral, lateral or sublateral microtrichose area. Pleuron entirely grayish microtrichose including anepisternum and katepisternum. Thoracic setae long, dark brown, and acuminate, including postpronotal, anterior notopleural, presutural and postsutural supra-alar, dorsocentral, acrostichal, intra-alar, postalar, 2 scutellar, 1 anepisternal, and katepisternal setae. Anepimeral and other anepisternal setae yellow. Posterior notopleural seta yellow, lanceolate, less than half as long as anterior notopleural. Dorsocentral seta aligned very close to transverse suture, much closer to it than level of postsutural supra-alar seta. Scutal setulae yellow, lanceolate, more or less evenly distributed in irregular rows on gray microtrichose areas; without setulae on posterior dark brown microtrichose area except 2 pairs of tight clusters of 5–10 setulae near posterior margin, 1 slightly medial to acrostichal line, 1 anterior to corner of scutellum. Scutellum with 5 clusters of yellow, lanceolate setulae, 1 pair proximal to basal seta, 1 pair on margin between basal and apical setae, and 1 unpaired cluster on margin between apical setae.

Wing ( Fig. 54): Costa with 3–4 setae at subcostal break 2–4 times as large as other costal setulae. Pterostigma 0.57 times as long as cell c, subtriangular; vein R 1 gradually curved. Vein R 2+3 moderately long, distance between apices of R 1 and R 2+3 / distance between apices of R 2+3 and R 4+5: 1.68. Crossvein r-m 0.73 distance from bm-cu to dm-cu. Wing pattern with 5 orange and moderate brown bands. Wing base, including cells bc and extreme base of cell br orange, extending into cells c, bm, and bcu and connecting with first band. First band extending from costal margin in distal half of cell c to posterior margin in anal lobe, covering crossvein bm-cu; distinctly broadened posteriorly, extended distally beyond apex of vein A 1 +Cu 2. Second band broadly connected to first band in cells br and dm, extending obliquely to posterior margin in cell cu 1. Third band connected to first band from costal margin to vein R, extending from pterostigma to posterior margin in base of cell m, touching or including apex of vein Cu 1, covering crossveins r-m and dm-cu; in cell r 1 distal margin perpendicular to costa, distinctly concave. Fourth band very broad in middle of cell r 1, well separated from apex of cell, with or without 1 small marginal hyaline spot within it; separate from fifth band, broadly separate on posterior margin. Fifth (apical) band elongate and narrow, extended to apex of vein R 2+3 or into cell r 1, separated from fourth band by slightly concave hyaline band, without hyaline marginal marks.

2+3

Abdomen: Tergites dark brown except lateral margin of syntergite 1+2; mostly moderately densely grayish microtrichose; male tergite 5, except extreme basal margin, and female tergite 6, except extreme basal and lateral margins, shiny nonmicrotrichose. Sternites yellow. Setulae whitish, lanceolate.

Male terminalia: Epandrium brown, shiny nonmicrotrichose. Lateral surstylus ( Figs. 66–67) tapering to very slender, acute apex, extending beyond apex of medial surstylus by 2.5 times length of prensisetae. Glans ( Fig. 68) similar to that of P. quinquefasciata . Female terminalia: Oviscape 1.3 mm long, 0.63 times as long as mesonotum, shiny nonmicrotrichose, with setulae yellow, slightly lanceolate.

Type data. Holotype ♂ ( CNC USNMENT00213089 ), ECUADOR: Cañar: El Tambo , 2800 m, 4–7 Mar 1965, L. E. Peña . Paratypes, same data as holotype, 1♀ ( CNC USNMENT00213088 ), 1♀ ( USNM USNMENT00213090 ) .

Etymology. The name of this species is a Latin adjective referring to its slanted apical wing band.