Toxomerus flaviplurus (Hall)

Borges, Zuleica M. & Couri, Marcia S., 2009, Revision of Toxomerus Macquart, 1855 (Diptera: Syrphidae) from Brazil with synonymic notes, identification key to the species and description of three new species 2179, Zootaxa 2179, pp. 1-72 : 34-35

Toxomerus flaviplurus (Hall)

( Figs. 7, 13, 28, 47, 48, 49, 98, 99, 100)

Mesogramma flaviplura Hall, 1927: 239 (descr.); Curran, 1930: 1 (key); 1934: 398 (key).

Mesogramma flavipleura Hull, 1943b: 15 , 28 (key & ill.).

Mesograpta flaviplura Fluke, 1956: 222 (cat.).

Toxomerus flaviplurus Thompson et al., 1976: 50 (cat. & n. comb.).

Male. Head: face 1/3 as long as eye width, yellow with black medial vitta, shiny except sparsely white pollinose and pilose laterally; gena black; frontal triangle yellow, white pilose; vertical triangle black, bronze pollinose, black pilose; occiput black, silver pollinose, with thick white pile, with a short row of brownish pile superiorly; antenna yellow to brownish, black pilose, arista brown.

Thorax: postpronotum yellow to brownish; proepisternum black, white pollinose; proepimeron black; scutum black except yellow laterally after transverse suture, bronze pollinose except for bluish-white pollinose medial vitta, yellow pilose; scutellum usually black, sometimes black with yellow margins, yellow pilose; anterior anepisternum black, long yellow pilose; posterior anepisternum black anterior 2/3, yellow pilose dorsally, and yellow posterior 1/3, yellow pilose; katepisternum black, sometimes with a little dorsal yellow macula, dull, yellow pilose; anepimeron black; plumula yellow to brownish, calypter yellow to brownish with brownish fringe except brown fringe on dorsal lobe; posterior mesothoracic pleuron (katepimeron, meron, katatergum, anatergum and postscutellum) black; methatoracic pleuron black; metasternum black; halter yellow ( Fig. 7). Legs: coxae black, yellow or black pilose; trochanters brown, yellow pilose; femora black, yellow on basal and apical extremities, yellow and black pilose; pro- and mesotibiae yellow, yellow and black pilose; metatibia black, yellow on basal extremity, black and yellow pilose; tarsi brown, black pilose. Wing: brownish, all microtrichose; alula as broad as cell BM appically or as broad as cell C, microtrichose ( Fig. 13).

Abdomen: terga yellow and black pilose; 1 st tergum all black; 2 nd tergum usually black with medial yellow fascia interrupt medially; 3 rd to 4 th terga black with yellow fascia on anterior 1/3 with sub-lateral triangular projection, sub-medial arcuate projection and medial yellow vitta extending from anterior to posterior brownish fascia; 5 th tergum usually black with medial yellow vittae and lateral and posterior yellow maculae ( Fig. 28). Male genitalia: surstylus very convex laterally and very concave medially, with scattered short setae; postanal process 3/4 as long as surstylus; aedeagus enlarged, proeminent dorsally; superior lobe somewhat quadrangular with short dorsal extension, with hairs anteroventrally, with small lobe posterodorsally with hairs ( Figs. 47–49).

Female. Similar to male except for the frons black, white pollinose, black pilose. Anterior anepisternum bare.

Female genitalia: 9 th tergum with somewhat elliptical black macula concave posteriorly; epiproct as kidney form; cercus slender; hypoproct somewhat triangular; 9 th sternum as in Fig. 99; three elliptical spermatecae, one of them smaller ( Figs. 98–100).

Length. Body 7.0–8.0 mm, wing 6.0–7.0 mm.

Type material examined. Holotype. GUATEMALA. Los Amates : Mesogramma flaviplura , female, 16–20/I/1905, S. Hine ( USNM).

Other material examined. BRAZIL. Amazonas: Manaus , 9 ♂, ♀, 12/V/1967, 13/V/1967, Y. Sedman ( USNM) ; Pará: Belém , 20♂, 12 ♀, 19/IV–03/IV/1967, Y. Sedman ( USNM) ;

Geographical record. Central America to northern Brazil.