Stipomorpha dichromata, Reemer, Menno, 2013

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 47

Stipomorpha dichromata spec. nov.

Figs 134–137 .

Studied type specimens. HOLOTYPE. BRAZIL. Female. Label 1: " Nova Teutonia / 27°11'S- 52°23'W / Brazil, 300- 500 m. / XI.1969 / Fritz Plaumann". Coll. CNC.

Description (based on holotype)

Adult female. Body size: 8 mm.

Head. Face occupying about 1/3 of head width in frontal view; shining dark brown; white pilose. Gena hardly developed, eyes almost directly bordering oral margin; brown. Lateral oral margins slightly produced; not reaching below eye margin in lateral view. Frons blackish brown; golden yellow pilose. Vertex shining blackish brown; golden yellow pilose; ocellar triangle equilateral. Occiput black; golden yellow pilose dorsally, yellowish white pilose ventrally. Eye bare. Antennal fossa about as wide as high. Antenna brown. Antennal ratio approximately as 2:1:4; basoflagellomere parallel-sided with rounded apex, with sensory pit at 2/3 from base. Arista slender, about 3/ 4 of length of basoflagellomere.

Thorax. Scutum black, with metallic hues along margins; appressed golden yellow pilose. Postpronotum, and postalar callus blackish, yellow pilose. Scutellum apically shallowly sulcate; blackish brown with metallic hues; appressed golden yellow pilose. Anepisternum weakly convex, without distinction between anterior and posterior part; dark brown; golden yellow pilose anteriorly and posteriorly. Anepimeron shining brown; entirely long yellow pilose dorsally. Katatergum and anatergum brown; long and short microtrichose, respectively. Katepimeron brown; bare. Katepisternum brown; yellow pilose dorsally, bare ventrally. Calypter and halter yellow.

Wing: hyaline, with faint brownish tinge, especially anteriorly; microtrichose except bare on 1st costal cell, basal 1/5 of cell r1, basal 3/4 of cell br, posterobasal 1/2 of cell bm, anterobasal 1/3 of cell cup.

Legs: Yellowish brown, femora darker basally; all femora and entire hind leg black pilose, front and middle tibiae and tarsi yellow pilose. Coxae and trochanters dark brown; white pilose.

Abdomen. Tergites 1 and 2 shining yellowish brown, with posterior margin of tergite 2 narrowly pale yellow; yellow pilose. Tergites 3-5 dark brown; shining with metallic hues, except for large dull part medially on anterior 3/ 2 of tergite 3 and small, oval dull part medially on anterior 1/4 of tergite 4; golden yellow pilose, except black pilose on dull parts. Sternites yellowish brown, yellow pilose, except sternite 1 bare.

Etymology. The name dichromata is Greek for two-coloured.

Diagnosis. The contrasting colour pattern of the abdomen is unique among all known Stipomorpha species: tergites 1 and 2 yellowish brown, other tergites dark brown.

Distribution. Only known from one specimen from Brazil, Nova Teutonia.

Figures

FIGURES 130 – 141. 130 – 133. Stipomorpha crematogastri female (holotype). 130. head frontal; 131. head lateral; 132. puparium dorsal; 133. puparium lateral. 134 – 137. Stipomorpha dichromata female (holotype). 134. habitus dorsal; 135. habitus lateral; 136. head frontal; 137. head lateral. 138 – 141. Stipomorpha elcopala male (holotype). 138. head frontal; 139. habitus lateral; 140. habitus dorsal; 141. wing.