Australachalcus browni Pollet 2005, SP. NOV.
Creators: name: Pollet, Marc
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Australachalcus
Australachalcus browni

description: AUSTRALACHALCUS BROWNI SP. NOV. (FIG. 16)    Male. Rather small, stout species. Head. Face dark brown, paler on clypeus, about 2¥ as wide as ocellus. Frons dark brown. Occiput flat with broad central furrow, dark brown, slightly shining green. Palp rather small (less than 1/4 of eye), rounded rectangular, reddish yellow with dark apex; with two black apical bristles. Antenna mainly dark with scape pale on apicoventral 1/3 and pedicel pale on ventral 2/3; first flagellomere elongate triangular, 1.9¥ as long and deep and 1.5¥ as long as scape and pedicel combined. Arista 0.8¥ as long as first three joints of antenna, distinctly subapical, with short pubescence (Fig. 16C).   
 Thorax entirely dark brown with slight green metallic reflection, with only postalar area slightly paler. Nine ac, more than 2¥ as long as distance between rows. One (broken off) sutural bristle present. Several small bristles present between dc 1–3, ps and sutural bristles.   
 Abdomen entirely dark brown with black genital capsule. Hypopygium with simple hypandrium; aedeagus dark, very long and rather straight; ventral bristle of surstylus with apical flag; VEP and DEP evident; postgonites whitish; cercus moderately large, ribbonshaped (Fig. 16E).   
 Wing. Halter pale. Wing rather pale, with R 4+5 and M 1+2 slightly diverging; R 4+5 curved. Proximal section of vein CuA 1 1.9¥ as long as apical section; CuAx ratio 1.7. Wing length 2.4–2.5 mm (n = 3) (Fig. 16A).   
 Legs including coxae mainly pale yellow with tarsi (especially of leg III) darker. Femur I with erect ventral bristle at basal 1/7, slightly longer than femur is deep, basad of av row of strong bristles, decreasing in length towards apex; most basal bristles erect, apical ones inclined towards apex; with two pv preapical bristles (Fig. 16D). Femur II with one row of strong inclined pv bristles on whole length, decreasing in length towards apex, basal bristles about as long as femur is deep; with one strong ad and one strong pv preapical bristles (Fig. 16B). Femur III with one ad (lacking) and one strong av preapical bristles. Tibia I and II whitish yellow, tibia I without dorsal bristles; tibia II with two strong ad and one rather strong pd bristles; ad bristles inserted at less than basal 1/3 and at middle, basal bristles forming ad-pd couple; tibia III with three moderate ad and three moderate pd bristles, without distinct erect setae among dense pubescence. Tarsus I whitish yellow with 4th and 5th tarsomeres very slightly infuscated, tarsus II pale yellow; tarsus III brownish yellow with 1st tarsomere somewhat paler. First tarsomere of leg III 0.8¥ as long as 2nd tarsomere. Body length 2.5–3.0 mm (n = 3).   
 Female. As in male, except for the following: face pale brown, very wide below antennae, distance between eyes at narrowest wide about 3¥ as wide as ocellus. Palp rectangular, reddish yellow with dark apex, 1/5 of eye. Antenna with 1st flagellomere brown with basal half paler; 1st flagellomere 1.4¥ as long as deep and 1.1¥ as long as scape and pedicel combined; arista 1.1¥ as long as first three joints of antenna. Femora distinctly infuscated dorsally along whole length, especially femur I. Femur II and III with dense, rather strong av and pv pubescence. Abdomen with six pubescent segments; 8th segment conical with six long setae instead of dornen; cercus slender, brownish. Body length 3.0 mm, wing length 2.5 mm.   
 Etymology. Species named in honour of Brian Brown (Natural History Museum of Los Angeles County, Los Angeles, USA), who initiated my interest in Costa Rican dolichopodid biodiversity and provided me with numerous Malaise trap samples.   
 Holotype. 1♂, COSTA RICA: San José, Zurqui de Moravia, 1600 m, iv.1991 (Hanson) (INBio; W).   
 Allotype. 1♀, same data.   
 Other paratypes. COSTA RICA: 1♂, San José, Zurqui de Moravia, 1600 m, vii.1991; 1♂, vi- vii.1993, MT
description: Published as part of Pollet, Marc, 2005, Systematic revision of Neotropical Achalcus and a related new genus (Diptera: Dolichopodidae, Achalcinae) with comments on their phylogeny, ecology and zoogeography, pp. 27-73 in Zoological Journal of the Linnean Society 143 (1) on pages 54-56, DOI: 10.1111/j.1096-3642.2004.00141.x, http://zenodo.org/record/5431996