A new species of Guatemalia steyskal (Diptera, Sciomyzidae)

Abstract

ABSTRACf. Guatemalla nlgrltarsis, sp.n. from Honduras is described and the male terminal ia iIIustrated. KEY WORDS. Snail-killing f1ies, Guatemalla, Sciomyzidae, Diptera Steyskal (1960) described Guatemalia, a monotypic genus, with G. hubbelli based on males from Guatemala (Panajachel). The sarne author (1966) examined the types, males and females fram Mexico (Guerrero) and Guatemala (Panajachel) of Tetanocera straminata Wulp, 1897 and recognized it as a synonym of his Guatemalia hubbelli. Here is described a second species.Guatemalia nigritarsis, sp.n. Figs 1-7General coloration: mostly dark brown with yellowish and silvery pruinescence; bristles blackish.Head. Second antennal segment about half of the face length. Face orange-brown, smooth and shiny; strongly concave in profile. Parafacial silvery-pruinose with a black spot at the limit with the frons. Fronto-orbital plate with an elongated and black spot. Ocellar triangle rounded by a black spot; ocellar bristles well-developed, proclinate and divergent; post-ocellar bristles longer and stronger than the ocellar; inner and outer vertical bristles similar to the post-ocellars; one weak orbital bristle about one third of the post-ocelIars.Thorax. Humeral calli and notopleuron with yellow pruinescence. Humeral and presutural bristles similar to the notopleural. Inferior third of the anepisternum with a silvery-pruinose stripe. Anepisternum and anepimeron bare. Subalar sclerite without valIar bristles. Mesonotum and scutelIum with two yellow stripes. Legs mostly yellowish; fore and middle coxae silvery-pruinose; femora and tibiae darkish at distal ends; tarsal segments wholIy darkish. Wings brownish, hyaline and white spotted.Male terminalia (Figs 1-7). Post-abdomen asymmetrical. Epandrium and 8th sternite symmetrical and well developed. Syntergosternite 6 + 7 present and well-developed on left side where it bears the 6th and 7th spiracles. 6th and 7th 1) Contribuição número 770 do