Hull (1949) described a new subgenus of Baccha for the obsoleta group, Aulacibaccha. This group of species included druida and the species titan Hull was designated as subgenotype.
Synonym:
Baccha druida Hull, 1947: 398.
Ocyptamus (Aulacibaccha) druida (Hull, 1947).
Hull, F.M. (1947) More flies of the genus Baccha (Diptera, Syrphidae). Revista de Entomología, Rio de Janeiro, 18, 395-410.
Adapted from original description (Hull 1947).
A large, ochraceous and vittate species, with wings deeply tinged with yellow and brown; related to arx Fluke but considerably more slender.
MALE.
Head: the ocellarium is considerably more prominent than in Ocyptamus titan; it is opaque black, becoming narrowly brownish yellow pollinose behind; the pile is black and situated in several rows which are not as wide as in arx or titan. The occipital pile is fine and yellow with three or four black hairs upon the shallow lateral excavation. The front is opaque, ochraceous brown; on the dorsal half there is a wedge-shaped triangle at most only linearly connected to the eye junction and below, beginning at the transverse crease, there is a short, transverse, bluish green macula Iying in front of the antennal callosity. Callosity yellowish with large, central, polished purplish or cupreous black macula which is partly striate, partly micropunctate on the dorsal half. Face yellowish ochraceous, the eye margins narrowly yellowish white pollinose; the tubercle is distinctly sharper than in titan. The pile of both the face and front is black. The antennae are elongate and reddish orange, the basoflagellomere narrowly brown above, thescape and pedicel thick black pilose, the arista brown but lighter basally.
Thorax: Scutum viewed from behind with four wied black vittae; the medial pair are narrowly separated and divergent posteriorly and do not reach the scutellum; in addition there are three brownish yellow pollinose vittae, the outer pair quite wide and reaching quite narrowly to the scutellum, the medial one narrow and also reaching the scutellum. The pleura are yellowish ochraceous, the anterior half of the anepisternum, the greater and ventral part of the katepisternum and the posterior half of the katatergum are sometimes diffusely metallic blackish; the calypter is light ochraceous with similar fringe, halter ochraceous brown with capitulum reddish. The scutellum is bownish-yellow, the sloping base widely light yellow pollinose; the disc almost sepia when viewed obliquely, its pile sparse,
erect and rather short, the ventral fringe consists of about twelve pairs of long black pile. Legs: pro- and mesolegs wholly light ochraceous yellow; metafemur reddish brown becoming darker towards the apex, the apex is however narrowly brownish yellow, the femoral pile black and nearly appressed. The metatibia black, the extreme apex and base yellowish, the pile black. The metatarsi are entirely pale yellow with yellowish white pile. Wings: brown in the middle and in the costal and throughout the subcostal cell in which there is a quite yellowish tinge, the yellowish tinge is a little more pronounced on the basal half of the cell R2+3; the cell BM and the basal half of the cell DM and the area immediately behind it is even more lightly yellowish brown resulting in a yellowish brown streak down the wing; the apical third of the wing, the posterior margin, nearly all of the cell DM, all of the cell CuP and anal lobe and the wide alula are brown or a light sepia color without yellowish tint.
Abdomen: the first tergum is widely yellowish upon the sides with only moderately abundant blackish pile and a few red pile below and anteriorly; in the middle and posteriorly the segment is brownish black; the second tergum is seven or eight times as long as its least width and brownish black with black pile of moderate length and with, near the apex, a Iong, lateral, very widely separated,distinct yellow macula on each side which is slightly narrowed anteriorly. The third tergum has a long, acute, sublateral triangle, its base resting on the base of the segment, its medial surface connected in the middle with a pair of slender, widely separated, yellow vittae which slightly widen posteriorly and are slightly divergent near the apex; these vittae do not reach the posterior margin. The fourth tergum is similar but the basal and sublateral triangles are smaller and disconnected from the submedial vittae; the submedial vittae almost reach the posterior margin. The fifth tergum has four vittae, the outer pair obscure, more narrow, diffuse and a little darker, but continuous; the medial pair become gradually attenuate, wider, lighter and quite distinct, and do not reach to the posterior margin of the segment. The fourth and fifth terga are quite distinctly emarginate with prominent crease.
unless otherwise stated