Quichuana pulverifacies, Ricarte & Marcos-García & Hancock & Rotheray, 2012

Ricarte, Antonio, Marcos-García, M. Ángeles, Hancock, E. G. & Rotheray, Graham E., 2012, Revision of the New World genus Quichuana Knab, 1913 (Diptera: Syrphidae), including descriptions of 24 new species, Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 166 (1), pp. 72-131 : 108-109

QUICHUANA PULVERIFACIES RICARTE & HANCOCK SP. NOV.

FIGURE 20

Description

Female

Head: Ocellar triangle with pale hairs; frons with an anteriorly directed chevron of pollinosity; frons with sparse, anteriorly and laterally directed, golden yellow hairs; dorsal surface of frontal prominence with hairs conspicuously longer than those on frons; antenna black; basoflagellomere straight ventrally and curved dorsally ( Fig. 20 ); bf = 1.5; face white pollinose, except for a very narrow central, shiny stripe not reaching the antennae nor the mouth edge; face with golden yellow hairs, bare on the central stripe; occiput with white pollinosity on the lower two-thirds.

Thorax: Scutum black, covered mainly in short, pale hairs; scutum with two conspicuous, white pollinose stripes extending beyond the TS; NP and PAPT posterodorsally with tufts of white hairs; hairs on PC longer than those on the scutum; scutellum dark brown, with short, pale hairs; legs black, except for tibiae, tarsi, and apical third of femora, which are darker, especially in metalegs; apicoventral half of metafemur with black hairs; ventral surface of mesotibia with scattered black hairs; wings brown, pigmented anteriorly and extensively microtrichose, except for some bare areas on cells BM, CuP, and alula; calypteres white, but with dark-brown margin.

Abdomen: Tapering towards the apex; terga black; terga I–IV mostly pale haired; tergum I without a conspicuous moustache arrangement of hairs; anterior section of the lateral margins of tergum II with long, white hairs, some of them wavy at the tip (the longest hairs at each of terga III–IV also occur on the anterior section of the lateral margins of terga); tergum V with scattered black hairs posteriorly; sterna with white hairs, shorter on sterna III–IV.

Male

Unknown.

Etymology

The noun in apposition ‘ pulverifacies ’ means ‘dusty face’ and refers to the fact that the face is extensively pollinose, only showing a short, narrow, central, shiny stripe.

Material examined (NHM)

Holotype: 1f, Upper Amazons, Peru, J.J. Mounsey/ Yahuas Terr, 16.vii–12.viii.13 (handwritten)/C. J. Wainwright Collection., B.M. 1948-488/ Quichuana ? bezzii Ceresa, N.P. Wyatt det. 1986 (species name and author handwritten).

Paratype: 1f, same data as those in the holotype, but without identification label.

Range

Peru.

Taxonomic notes

Very large species (14.7 mm) with slender abdomen; body extensively pale haired; similar to Q. knabi but conspicuously larger; face covered in pollinosity more than any other species; in Q. pulverifacies sp. nov. the basoflagellomere is shorter (bf = 1.5) than that of Q. knabi , and nearly oval ( Fig. 20 ), whereas in Q. knabi it is elongate; cell BM and the alula have areas bare of microtrichia, whereas in Q. knabi these are microtrichose.

QUICHUANA QUIXOTEA HULL, 1946

Figures

Figures 20–22. Quichuana right antennae, lateral inner view: 20, Quichuana pulverifacies sp. nov., female holotype; 21, Quichuana bezzii, male lectotype; 22, Quichuana undulatipila sp. nov., male holotype. Scale bars: 1 mm (top scale bar applies to Fig. 20 only).