The subgenus Pipunculosyrphus is distinguished by: metasternum bare, eye bare, antenna short, vein M1 sinuate, metaespisternum bare, anterior anepimeron pilose, alula reduced about as wide as costal cell, and wing extensively microtrichose.
Hull (1937) created this subgenus for small flies with bright markings and very large head, considerably wider than thorax, abdomen with parallel sides, wing longer than abdomen with alula nearly or completely absent.
Ocyptamus (Pipunculosyrphus) globiceps (Hull, 1937).
Hull, F.M. (1937) New species of exotic syrphid flies. Psyche 44, 12-32, pl. 2.
Hull (1937) described a new genus, Pipunculosyrphus, and designated globiceps as genus-type. Later, Hull (1949) moved his genus under Baccha as a subgenus. Thompson et al. (1976) moved this taxon under Ocyptamus.
Synonyms:
Pipunculosyrphus globiceps Hull, 1937: 30.
Baccha tiara Curran, 1941: 271.
New description:
MALE.
Head: Face with distinct facial tubercle, retreating ventrad the tubercle, yellow, yellow pilose, white pollinose laterally; gena small, not visible from lateral, yellow; lunule yellow with medial black macula; frontal triangle yellow, dark brown on posterior half, densely white pollinose, dark pilose; holoptic, eye bare; vertical triangle elongate and narrow, black, black pilose; antenna yellow, basoflagellomere darker dorsally; occiput black, silver pollinose, withish-yellow pilose on ventral 2/3, black pilose on dorsal 1/3. Head broad, broader than thorax.
Thorax: Scutum yellowish-orange, yellow pilose with few black pile laterally, densely yellow pollinose on notopluron; postpronotum yellow, bare; scutellum yellow, black pilose, subscutellar fringe with few pile, incomplete. Pleuron yellow, yellow pilose; anterior anpisternum pilose dorsally; metasternum bare; calypter yellow; plumula absent; halter yellow, capitulum darker; spiracular fringes yellow. Wing: Wing membrane mostly hyaline, stigma brownish; apically microtrichose, cells CuP, BM and R basally bare. Alula very narrow, narrower than costal cell. Legs: Proleg yellow, meso- and metaleg slightly darker, brownish.
Abdomen: Parallel-sided, unmargined. Dorsum mainly yellowish-orange basally becoming darker apically. Tergum 1 yellow; terga 2, 3 and 4 yellowish-orange with medial black macula and two oblique yellow fasciate maculae, with a bright dark posterior fascia; tergum 5 dark with medial black macula and two medial yellow vittae broadening posteriorly.
FEMALE.
Very similar to male with frons yellow basally, dark on dorsal 4/5 connected with the medial black macula of the lunule, white pollinose laterally, bronze pollinose medially.
unless otherwise stated