Quichuana subcostalis, (WALKER, 1860)

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 : 115-116

QUICHUANA SUBCOSTALIS ( WALKER, 1860) XYLOTA SUBCOSTALIS WALKER, 1860: 291

This species was described from, apparently, a single specimen belonging to the collection of W.W. Saunders ( Walker, 1860). Although Walker (1860) did not mention the type material, Hull (1946) examined the type, a female in NHM, and described additional characters not included in the original description. We also examined the type, which has the left basoflagellomere missing, labelled as follows: Holo-, type / Type / subcostalis (handwritten by Walker)/ Xylota , subcostalis, Wlk (handwritten by E.E. Austen)/ Mexico.

Diagnostic features

Female

Elongate basoflagellomere (bf = 2); face with a central stripe and two narrower, lateral, shiny stripes; face golden yellow haired, except for the central stripe, which is bare; pro- and mesotibia and tarsi lighter than metatibia and tarsi, all brown; anterior margin of wing brown pigmented, but cell C less pigmented; wing extensively microtrichose; cell BM with a small bare area along the central part of the posterior margin, cell CuP with most of the basal quarter bare and alula with a large bare area anteriorly; tergum I with a moustache arrangement of golden yellow hairs; terga II – IV with erect, yellow hairs except for the posterior margin, which has black hairs on a quarter to fifth of tergum II, half of tergum III, and about half of tergum IV.

Material examined

Holotype (see data above).

Range

Mexico.

Taxonomic notes

Large species (12.5 mm) with slender abdomen; similar to Q. picadoi and Q. sylvicola ; however, the female of Q. picadoi has a slightly longer basoflagellomere (2.1–2.4) than that of Q. subcostalis (bf = 2); also females of Q. picadoi have silver white hairs on the face, whereas in Q. subcostalis these hairs are golden yellow; Q. subcostalis is easily separable from Q. sylvicola because the latter species has an extensively microtrichose alula, whereas that of Q. subcostalis is largely bare.

QUICHUANA SYLVICOLA KNAB, 1913