Lasalleistichus albifasciatus, Hansson, 2020

Hansson, Christer, 2020, Lasalleistichus a new genus of Tetrastichinae (Hymenoptera: Eulophidae) from the Neotropical regionı including four new species, Journal of Natural History 54 (9), pp. 621-633 : 628-629

Lasalleistichus albifasciatus , sp. n.

( Figure 1 (b,f))

Diagnosis. Similar to L. albiclava but with midlobe of mesoscutum convex with strong reticulation ( Figure 1 (f)); propodeum with strong reticulation ( Figure 1 (f)); Gt 1 with a white band along posterior margin ( Figure 1 (b,f)); petiole shorter, 1.0× as long as wide ( Figure 1 (f)); gaster longer, 1.9× as long as wide, and more pointed at apex ( Figure 1 (f)).

Description. Female holotype. Length 1.7 mm. Head. See description for genus. Mesosoma. Mesoscutum convex, sidelobes with very weak reticulation, midlobe with engraved and strong reticulation; midlobe with median groove indicated in posterior ½. Mesoscutellum with very fine and weak reticulation between submedian grooves, lateral to grooves with strong reticulation. Axillae with very weak reticulation. Propodeum with strong reticulation throughout; callus with three setae. Fore wing with four setae on the dorsal surface of submarginal vein. Metasoma. Petiole without distinct lateral spines. Gaster ovate-elongate; Gt 1 – 2 smooth and shiny, Gt 3 – 7 with very fine and weak reticulation.

Ratios. Head: w/l (dorsal view) 1.95; w/l (frontal view) 1.32; POL/OOL 1.52; posterior ocellus w/POL 2.0; head w/mss w 1.28; mouth w/MS 1.56; MS/HE 0.43; scape l/HE 0.71; distance toruli to anterior ocellus/toruli to mouth margin 1.14; flg+ped l/mss w 1.59; scape l/ w 3.75; F1 l/ w 3.14; F2 l/ w 2.13; F3 l/ w 1.75; clava l/ w 3.11; ped l/F1 l 0.86; F1 l/F2 l 1.29; F1 l/F3 l 1.57; F1 l/clava l 0.79; F2 l/clava l 0.61; F3 l/clava l 0.50; F1 w/ped w 1.17; antennal spicule l/C3 l 0.27. Mesosoma: l/ w 1.56; midlobe msc l/scutellum l 1.33; dorsellum l/ppd l 0.39; sct l/ w 0.88; distance between smg anteriorly/posteriorly 0.70; part between smg w/ part lateral of smg w (both measured medially) 2.71; part between smg l/w (width measured medially) 1.58; CC l/ w 16.7; CC l/MV l 0.78; MV l/SV l 5.33. Metasoma: petiole l/ w 1.0; gaster l/ w 1.88; gaster l/mss l 1.28; Gt 7 l/ w 0.56; longest cercal seta l/next longest cercal seta l 2.67.

Colour. Head yellowish-brown ( Figure 1 (b,f)), with vertex slightly darker than frons. Antennal scape yellowish-white with dorsal edge yellowish-brown, pedicel and F1 – F3 dark brown, clava with C1 brown with apical part white, C2 – C3 white ( Figure 1 (b)). Pronotum, mesoscutum and axillae yellowish-brown ( Figure 1 (f)); mesoscutellum dark brown with anterolateral part dark yellowish-brown; setae on pronotum, mesoscutum and mesoscutellum black. Dorsellum dark yellowish-brown. Propodeum dark brown. Pro- and mesopleura yellowish-brown, metapleuron dark brown ( Figure 1 (b)). Tegulae dark brown; wing venation yellowish-white; fore wing hyaline with median part distinctly infuscate ( Figure 1 (b,f)); hind wing completely hyaline. Legs with fore and hind coxae white, mid coxa yellowish-brown; trochanters on fore and mid legs brown, white on hind leg; femora and tibiae dark brown; tarsi yellowish-brown ( Figure 1 (b)). Petiole reddishbrown. Gaster dark brown with posterior margin of Gt 1 white ( Figure 1 (f)).

Variation. Length 1.5 – 1.8 mm. One paratype with three setae on the dorsal surface of submarginal vein, another paratype with anterior one-half of midlobe mesoscutum dark brown, and another paratype with four setae on propodeal callus.

Material examined. HOLOTYPE ♀ ‘ PERU: Madre de Dios, Rio Tambopata Res. , 30 km SW Puerto Maldonado, 290 m, x.1983, N.E. Stork ’ in NHM.

7♀ PARATYPES. 4♀ with same label data as holotype ( NHM); 1♀ ‘ COSTA RICA: Limón, Hitoy-Cerere , BR HQ, 14 – 18.i. 1991, 100 m, J.S. Noyes ’ ( NHM); 1♀ ‘ COSTA RICA: Heredia, E.B. La Selva , 10°26 ʹ N 84°01 ʹ W, 27 – 28.ii.2003, J.S. Noyes ’ ( NHM); 1♀ ‘ COSTA RICA: Limón, Valle La Estrella , R.B. Hitoy Cerere , 100 m, 8.viii-14.ix.1994, G. Carballo, MT, LN 184900/643400 #3235 ’ ( MZUCR).

Distribution. Costa Rica, Peru.

Etymology. From the Latin albus = white, and fascia = band, referring to the white band on Gt 1.

Figures

Figure 1. (a) Lasalleistichus albiclava, ♀ holotype habitus lateral. (b) L. albifasciatus, ♀ holotype habitus lateral. (c–e) L. albiclava ♀: (c) paratype head frontal; (d) paratype fore wing; (e) holotype habitus dorsal. (f) L. albifasciatus, ♀ holotype habitus dorsal. Scales: (a–b, e–f) 1 mm; (c–d) 0.5 mm.