Eusterinx (Eusterinx) australis Dasch, 1992

Humala, A. E., 2025, A review of Mexican species of the genus Eusterinx (Hymenoptera: Ichneumonidae: Orthocentrinae), Zoosystematica Rossica (China) 34 (1), pp. 149-159 : 155-157

Eusterinx (Eusterinx) australis Dasch, 1992

Material examined. Mexico, Tamaulipas, Hidalgo, Conrado Castillo , bosque de pino [pine forest], 9 Sept. 1995, C. Covarrubias leg., 1 female ( UAT) .

Distribution. Nearctic species: USA, Mexico

(Tamaulipas) (Humala et al., 2011).

Eusterinx (Eusterinx) madorae Khalaim et Kasparyan in Khalaim et al., 2018

( Figs 10–16)

Type material examined. Paratypes. Mexico, Veracruz, San Andrés, Biological Station Los Tuxtlas, 18°34′55.4ʺN 95°04′34.7ʺW, 207 m a.s.l., selva alta perennifolio [high evergreen rainforest], MT 2 , 16 . VI – 24.VII.2013, M. Madora leg., 1 female ( ZISP) .

Other material examined. Mexico, Jalisco, Chamela Biological Station , 19°30′17.46ʺN 105°02′16.296ʺW, 45–135 m a.s.l., 3 Sept. 2009, H. Clebsch & A. Zaldívar leg., 1 male ( UNAM) .

Remarks. Eusterinx madorae was known only from the type series, which included only females. The first description of male is presented below.The female of E. madorae ( Fig. 16) has been described in detail, therefore only thedifferences between the two sexes or characters missed in the female description are presented here. It should be noted that this male is almost twice as small as the previously described females (fore wing length 11.0 mm, body length 15.0 mm), its coloration is noticeably lighter, and a number of other characters differ from those of the female. All this is likely attributable to intraspecific variability and sexual dimorphism.

A large set of distinctive characters does not allow one to assign E. madorae to any of the recognised subgenera of Eusterinx . The solution of this taxonomic problem requires the study of additional Neotropical material and re-evaluation of the subgeneric limits. It will be the subject of my next article on the genus Eusterinx . Thus, for the time being, I leave E. madorae formally in the Eusterinx s. str.

Description. Male ( Figs 10–15). Body length 6.6 mm; fore wing length 4.7 mm.

Antenna as long as body ( Fig. 10), tapered apically, with 24 elongate flagellomeres; first flagellomere about 5.7 times as long as wide; tyloids present on flagellomeres 6–7 ( Fig. 13). Eyes less enlarged than in female, face wider (1.5 times as wide as high vs. 1.2 times in female); inner facial orbits nearly parallel; anterior tentorial pits large, open ( Fig. 11). Hypostomal carina strongly raised as lamella.

Mesosoma 1.5 times as long as high; notaulus deeply impressed, smooth and well-bordered, but not joining frontal edge of mesoscutum and scuto-scutellar furrow ( Fig. 12). Epicnemial carina complete ventrally, but not expanded medioventrally into conspicuous lobe as in female; sternaulus short and shallow; submetapleural carina moderately strong along its entire length; metapleuron centrally without transverse wrinkles. Propodeum with area basalis short, clearly transverse; area superomedia elongate, 1.8 times as long as wide, slightly narrowed posteriorly; posterior transverse carina almost evenly arched ( Fig. 14); propodeal spiracle large, ovoid, connected with pleural carina and longitudinal lateral carina by short transverse keels.

Fore wing with areolet rhombic, petiolate, narrowed posteriorly; nervulus interstitial (antefurcal in female); postnervulus intercepted in lower third. Legs moderately slender; hind coxa elongate, 1.6 times as long as broad; hind femur 4.5 times as long as wide; hind tarsomere 3 as long as tarsomere 5.

First tergite 2.5 times as long as wide posteriorly, petiole nearly parallel-sided; posterior margin of first sternite slightly behind spiracle (at 0.57 of tergite length and spiracles at 0.55 of tergite length, vs. 0.63 and 0.54, respectively, in female). Second tergite 0.9 times as long as wide posteriorly (vs. 2.2 times in female).

Coloration predominantly yellowish orange, generally lighter than in female ( Fig. 10); flagellum with flagellomeres 1 to 5 yellow, flagellomeres 6 to 8 pale yellow and remainder dark brown. Tergites 2 and 4–6 brown, tergite 3 predominantly pale yellow ( Fig. 15), brown in anterior third. Gonostyle pale yellow. Wings hyaline, infuscation weak; transverse band and tip of fore wing only slightly infuscate; veins and pterostigma brown.

Distribution. Neotropical species: Mexico (Veracruz, * Jalisco).