Closterocerus atrifasciatus, Hansson, 2022

Hansson, Christer, 2022, Eulophidae Of Costa Rica (Hymenoptera: Chalcidoidea), 4 The Genus Closterocerus Westwood S. Str., Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) 1 (1), pp. 1-137 : 24-25

Closterocerus atrifasciatus sp.nov.

( Figs 40–42 )

Diagnosis. Antenna flattened, scape widest at apex ( Figs 41, 42 ); frons with upper border distinct ( Fig. 41 ); pronotal collar with a carina along anterior margin ( Fig. 40 ); midlobe of mesoscutum with 3–4 pairs of short setae ( Fig. 40 ); mesoscutum and mesoscutellum with a black longitudinal band ( Fig. 40 ); propodeum with a strong and complete median carina ( Fig. 40 ); fore wing infuscate with area below marginal vein and a band close to apical margin hyaline, speculum open below ( Fig. 40 ); hind tarsus with T1–3 white, T4 black and long, 2.6× as long as width at apex ( Fig. 42 ); petiole as long as wide with strong sculpture on dorsal surface; length of body female 1.9–2.1mm.

Female holotype: length of body 2.1mm.

Antenna dark brown to black. Frons black with metallic tinges. Vertex with anterior one-half metallic bluish-purple, posterior one-half metallic blue. Mesoscutum with median part of midlobe black, sidelobes and lateral parts of midlobe metallic blue. Mesoscutellum with median part black, lateral parts metallic blue. Dorsellum metallic blue. Propodeum black. Coxae, femora, mid and hind tibiae black with metallic tinges; fore tibia and tarsus yellowish-brown; mid and hind tarsi with T1–3 white, T4 black. Fore wing infuscate with area below marginal vein and a band close to apical margin hyaline, hind wing hyaline. Petiole black. Gaster with Gt 1-2 with median one-third black and lateral parts metallic blue; Gt 6 metallic blue, remaining tergites black.

Antenna flattened, scape widest at apex. Frons with strong reticulation; frontofacial suture Vshaped; upper border of frons distinct. Subtorular sutures present but difficult to see because they are short and dark. Vertex with strong reticulation. Occipital margin rounded.

Pronotal collar with a carina along anterior margin. Mesoscutum with strong reticulation; notauli distinct in anterior four-fifths; midlobe with three pairs of short setae. Mesoscutellum convex, with strong reticulation. Dorsellum convex and smooth. Propodeum with weak reticulation, partly smooth, with a strong median carina; callus with two setae. Fore wing speculum open below; hyaline part below marginal vein bare; with a stigmal hairline and with radial cell bare.

Petiole as long as wide, with strong sculpture on dorsal surface. Gaster ovate; Gt 1-2 with metallic blue lateral parts smooth, median black part with strong reticulation, remaining tergites with strong reticulation.

Relative measurements: head length dorsal 23; head length frontal 27; head width 43.5; POL 7; OOL 5.5; lateral ocellus maximum width 3; eye length 21; malar space 10; mouth width 11.5; mesosoma length 68; mesosoma width 41; mesoscutellum length 25; mesoscutellum width 25; fore wing length 100; fore wing width 53; marginal vein length 60; postmarginal vein length 3; stigmal vein length 7; fore wing marginal fringe length 7; gaster length 75; gaster width 45.

Variation in paratype material. Length of body: 1.9–2.1mm. Vertex with anterior one-half metallic bluish-purple or bluish-green, posterior one-half metallic blue or golden-green. Mesoscutum and mesoscutellum, apart from black median part, metallic blue or golden-green; dorsellum metallic blue or golden-green; midlobe of mesoscutum with 3–4 pairs of setae.

Male. Unknown.

Hosts. Unknown.

Distribution. Costa Rica, Mexico.

Material examined.

Type material. Holotype ♀ “ MEXICO, Oaxaca, 6mi NE Mitla , 20.vii.1985, J.B. Woolley, 85/077” ( TAMU) . Paratype: 1♀ “ COSTA RICA: San José, San Pedro de Montes de Oca , 1200m, 19.ii.2001, J.S. Noyes ” ( NHMUK) .

Etymology. From the Latin atra = black and fascia = band, referring to the black band on thoracic dorsum.

Figures

Figs 36–40. Closterocerus spp. C. apiculus – (36) habitus dorsal view, paratype ♀; (37) habitus lateral view, holotype ♀; (38) habitus dorsal view, paratype ♂; (39) habitus lateral view, paratype ♂. C. atrifasciatus, holotype ♀ – (40) habitus dorsal view.

Figs 41–46. Closterocerus spp. C. atrifasciatus, holotype ♀ – (41) head frontal view; (42) habitus lateral view. C. aureolus – (43) habitus dorsal view, holotype ♀; (44) habitus lateral view, holotype ♀; (45) habitus dorsal view, paratype ♂. C. aureopurpureus, paratype ♀ – (46) habitus dorsal view.