Cheiloneurus mago, Noyes, 2023

Noyes, John Stuart, 2023, ENCYRTIDAE OF COSTA RICA (HYMENOPTERA: CHALCIDOIDEA), 4 Subfamily Encyrtinae: tribes Arrhenophagini, Habrolepidini, Cerapterocerini, Cheiloneurini, Trechnitini, Cercobelini, Polaszekiini, Protyndarichoidini, Gahaniellini and Syrphophagini (part), mainly primary parasitoids and hyperparasitoids of Coccoidea and Psylloidea (Hemiptera), Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) 2 (11), pp. 1-921 : 336-338

Cheiloneurus mago sp.nov.

( Figs 833-839)

DIAGNOSIS. Female (length about 1.5mm): head orange to orange-brown, axilla and scutellum orange, rest of body dark brown with a weak to moderate metallic sheen; antenna ( Fig. 836) with scape mostly white with dorsal and ventral margins largely brown; pedicel and flagellum dark brown; mesoscutum mostly with translucent, silvery setae; coxae white; fore femur and mid legs mostly white to pale orange, remainder of legs mostly dark brown; fore wing ( Fig. 834) mostly infuscate with basal cell mostly hyaline, a small hyaline area at apex of venation, another similar-sized area opposite and apex with a subtriangular hyaline area; head ( Fig. 833) about 5.2X as wide as frontovertex, in facial view slightly broader than long, subquadrate, genae slightly converging, straight, but strongly curved inwards near mouth; frontovertex naked medially between anterior ocellus and scrobes; eye separated from scrobe by slightly less than diameter of anterior ocellus, area between eye and scrobe completely smooth; scrobes deep, sharply margined, carinate below eye; interantennal prominence with about 30 inconspicuous setae and dorsally rounded and without a median ridge; mandible tridentate; antenna ( Fig. 836) with scape about 4.4X as long as broad; F1-F5 longer than broad, F6 transverse; linear sensilla on F1-F6; clava 3-segmented, slightly shorter than F4-F6 combined; sensory area enlarged, extending ventrally nearly 0.3X length of clava, apex obliquely truncate; head width hardly less than flagellum length; mesoscutum mostly with coarse, polygonally reticulate sculpture, slightly more elongate antero-laterally; scutellum with a distinct, apical tuft of setae; wings fully developed, fore wing ( Fig. 834) about 2.7X as long as broad; parastigma slightly downcurved; costal cell dorsally with a single apical seta, ventrally with a line of setae in proximal 0.7X, apex naked; area below proximal part of parastigma with a group of about 14 setae; apices of postmarginal and stigmal veins connected by a naked hyaline area that hardly continues into disc ( Fig. 837); apical bristle of postmarginal vein about 0.6X as long as marginal vein; mid tibial spur slightly longer than basitarsus; propodeum with about seven inconspicuous setae adjacent to spiracle, side naked; syntergum about 0.8X as long as mid tibia with apex acute; ovipositor ( Fig. 835) about 3.6X gonostylus or about 1.5X mid tibia; gonostylus about 1.2X as long mid tibial spur; exserted part of ovipositor about 0.7X as long as mid tibial spur. Male: unknown.

Female (holotype): length, including ovipositor, 1.51mm; excluding ovipositor, 1.38mm ( CPD) .

Head mainly orange-brown; occiput pale orange with a dark brown triangular mark above foramen; scrobes, lower interantennal prominence and mouth margin pale orange; frontovertex with area between occipital margin and posterior ocelli metallic purple, violet and dark blue, dark blue between ocelli, a slight brassy sheen and weak blue and purple reflections in front of ocelli, purple immediately above scrobes; area between eye and scrobe with a slight purple and blue-green sheen; temple with a relatively strong metallic green and blue-green sheen with some brassy areas, eye margin narrowly coppery; gena relatively dull with green, coppery and brassy reflections; dorsal part of interantennal prominence with a distinct purple sheen, scrobal area otherwise with only a weak brassy and purple sheen; frontovertex clothed with inconspicuous, pale brown setae, these continued as a line below eye; gena and interantennal prominence with a few short, translucent setae; antenna ( Fig. 836) with radicle orange, dark brown at apex; scape mostly white, ventral margin dark brown from base to about 0.75X along its length, wider on inner surface, dorsal margin orange for most of its length, apex dark brown; pedicel and flagellum dark brown, almost black, external surface of pedicel weakly mixed orange; maxillary palpus white; pronotum orange, neck and side dark brown; propleuron orange, dark brown near coxa; prosternum white, brown anteriorly; mesoscutum black with weak blue and purple reflections, anteriorly clothed with translucent golden brown setae, but mostly with translucent silvery setae; tegula dark orange-brown, paler orange-brown towards apex; axilla and scutellum orange with scattered, weak, coppery reflections, axilla clothed in translucent brown setae, scutellum anteriorly with translucent, paled orange setae, posterior part and subapical tuft black; metanotum dark brown; mesopleuron dark brown, anteriorly with a weak brassy, coppery and blue sheen, posteriorly with a relatively strong purple sheen; mesosternum dark brown; fore coxa white; fore femur white, apex pale orange, tibia dark brown, extreme base and apex orange, tarsus brown; mid coxa white; mid femur white with an incomplete dark brown, subapical band, tibia pale orange, dark brown at extreme base otherwise white at base, with a faint, incomplete subbasal, brown band and an external dark brown streak for most of its length, spur and tarsus pale orange; hind coxa white; hind femur broadly brown medially, base white, a subapical orange area, apex dark brown, tibia dark brown, white at base, tarsus pale orange, basitarsus partially brown, apex brown; fore wing ( Fig. 834) mostly infuscate, largely hyaline towards base, submarginal and stigmal veins orange, otherwise venation brown; propodeum dark brown, with a weak purple sheen, mixed metallic green laterally, side brassy and metallic blue, 6 or 7 translucent, white setae outside spiracle; gaster dark brown, mostly with weak purple and brassy sheen, Gt1 with a metallic green sheen, side of Gt1 with a metallic blue sheen, sides of Gt2-Gt5 with a metallic green sheen mixed with coppery and blue-green; gonostylus pale orange.

Head ( Fig. 833) about 5.2X as wide as frontovertex, in profile about 1.7X as high as deep, frontovertex weakly and evenly curved to top of scrobes then slightly angled towards mouth margin and virtually straight from top of scrobes to mouth margin, interantennal prominence hardly protuberant; occipital margin sharp, carinate; ocelli forming an angle of about 50°; frontovertex quite shiny, with shallow, fairly regular, polygonally reticulate sculpture of mesh size smaller than, or subequal to, diameter of eye facet, sculpture slightly coarser and more transversely elongate immediately above scrobes; upper part of interantennal prominence smooth, but below with moderately deep, regular polygonally reticulate sculpture; temple virtually smooth but very shallow, irregular, longitudinally elongate polygonally reticulate sculpture, posterior part of gena with similar sculpture, anterior part of gena with regular, polygonally reticulate sculpture; area between eye and scrobe slightly narrower than diameter of anterior ocellus and completely smooth; scrobes deep, meeting dorsally, sharply margined, carinate below eye, very broadly ∩-shaped, interantennal prominence dorsally broadly rounded, without a median ridge; antenna as in Fig. 836; scape broadened and flattened, broadest about middle, about 4.4X as long as broad; F1-F5 longer than broad, F5 subquadrate, F6 transverse but subquadrate, segments wider and larger distally so that F6 is largest and widest, linear sensilla present only on F1-F6; clava slightly broadened, a little shorter than F4-F6 combined, sensory area slightly enlarged, extending about 0.3X along ventral surface, giving it an obliquely truncate appearance; eye reaching occipital margin, appearing naked, but clothed with inconspicuous, very short setae that are much shorter than diameter of facet; inner eye margins subparallel, narrowest point of frontovertex a little in front of anterior ocellus; malar sulcus absent; clypeal margin medially weakly concave; mandible with three acute teeth; apical segment of maxillary palpus not enlarged, hardly longer than radicle. Relative measurements: HW 85, HH 83, FV 16.5, POL 6, OOL 0, OCL 9.5, AOL 10, EL 58, EW 46, MS 36, SL 48.5, SW 11.

Thorax ( Fig. 839) with pronotum hardly exposed behind head and about 0.6X as long as mesoscutum with similar, regular sculpture to that between ocelli, but slightly deeper and finer; mesoscutum fairly shiny with slightly deeper, coarse, fairly regular, polygonally reticulate sculpture which is slightly more elongate antero-laterally; axilla and scutellum with similar sculpture to pronotum; visible part of mesoscutum about 1.8X as broad as long; scutellum about as long as broad with a distinct subapical tuft, setae mostly about 0.8X as long as scutellum; hind femur about 5.5X as long as broad; fore wing with venation and setation as in Figs 834, 837; costal cell naked dorsally at apex; apices of postmarginal and stigmal veins connected by a distinct, naked, hyaline streak ( Fig. 837); mid tibia with a weak, external carina in proximal half; propodeum ( Fig. 839) medially about 0.2X as long as scutellum and smooth. Relative measurements: FWL 86, FWW 32; HWL 73.5, HWW 17.

Gaster without “gland-like” structures on Gt1 or Gt5; hypopygium( Fig. 838) reaching about 0.4X to apex; syntergum about 0.8X as long as mid tibia, with apex acute; ovipositor ( Fig. 835) clearly exserted, the exserted part about 0.7X as long as mid tibial spur or less than 0.25X as long as mid tibia. Relative measurements: OL 61, GL 17 [MT 42].

Variation. Only holotype examined,

Male. Unknown.

DISTRIBUTION. Costa Rica.

HOSTS. Unknown.

MATERIAL EXAMINED.

Type material. Holotype E: COSTA RICA, Alajuela, RF Arenal, Sector Colada , LN 269900 456750, 600m, #54371, 1-26.x.1999 (G. Carballo) . Holotype in NHMUK .